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HomeMy WebLinkAbout1977-04-26 Info Packet0 P41,., „Y MW NEWS RELEASE Restoration of Airplane April 22, 1977 Project GREEN will make every effort to restore the airplane to the Airport grounds, Nancy Seiberling, member of Project GREEN Steering Committee, announced today. The tree planting program will proceed as scheduled along one mile of 218 south on Saturday, with the exception of the area of the plane. FROM: Administrative Offices CITY OF IOWA CITY CIVIC CENTER, 410 E. WASHINGTON ST. IOWA CITY, IOWA 52240 319354 19M 86/ �r • PROJECT EXECUTION SCHEDULE Iowa City Urban Renewal Summer, 1977 APRIL: Staff Activities: 4/25 Plan Change drafted Draft Solicitation Work with designers on Mall design concepts • ' Council Activities: 4/26 Set May 10 as date for hearing on Plan Change MAY: Staff Activities: 5/2 Advance letter to developers 5/2 Plan change presented to P 6 Z 5/18 Issue solicitation documents 5/18 Publish Legal Notice - availability of solicitation 5/23 Review plans and specs. subsurface mall improvements Council Activities: 5/3 Set May 17 as hearing date on G.O. bond issue 5/9 Review solicitation draft - informal session 5/10 Public hearing - Urban Renewal Plan Change 5/10 Set May 24 as hearing date on Plans and Spec's - Mall project, sub- surface improvements 5/16 Review and approve final solicitation documents 5/17 Hold public hearing - G.O. bond issue 5/17 Vote on Resolution to amend the Urban Renewal Plan 5/24 Public hearing on plans and specs - mall subsurface improvements 5/31 Let bids - mall subsurface improvements 5/31 Resolution directing advertisement of G.O. bond issue JUNE: Staff Activities: Revic:: records for Urban Renewal Audit 6/3 Developers workshop 6.16 or 6!7 Netting wi_t SBk and smell businesses 6/8 Presentation of mall design concepts to Design Review Committee; prepare staff report Council Activities: 6/13 Rovxet, of hall de�igu concepts ut informul meting 6/21 Award contract for mall subsurface improvements 6/23 G.O. bond issue bid opening - special meeting J"2 0 JULY: -2- 0 Staff Activities: Prepare documents for LPA to City land transfer File for Project R-14 closeout with HUD 7/6 Present detail design of the mall to the Design Review Committee; prepare staff report 7/18 Closing date for receipt of development proposals; begin proposal review process Council Activities: 7/5 Resolution transferring balance of LPA land to the City 7/11 Review detail design for mall - in£'ormal meeting 7/18 Receive redevelopment proposals - informal meeting AUGUST: Staff Activities: Assist with Urban Renewal Audit Review development proposals Assist with final plans and spec's for mall - surface improvements Council Activities: 8/2 Set August 16 as date for public hearing on plans and spec's on mall surface improvements 8/8 Review redevelopment proposals and staff reports - informal meeting 8/15 Review redevelopment proposals and staff reports - informal meeting 8/16 Select and designate successful developers 8/16 Hold public hearing on plans and spec's - mall surface improvements 8/13 Let bids on mall - surface improvements SEPTaIBER: Staff Activities: Negotiate disposition contracts Council Activities: Approve disposition contracts as applicable 9/6 Award contract - mall surface improvements •City of Iowa Cit DATE: April 22, 1977 TO: Neal*Berlin and City Council FROM: Dick P 1 astino, Director of Public kbrks RE: Storm water specifications /Y As you recal 3. the Storm Water Management Ordinance requires Council adoption of specifications on storm water design and erosion control. The booklet on storm water specifications is complete. The process for this document was as follows: 1. The City Engineering staff worked in close conjunction with Powers -Willis and Bill Lindley to prepare technical speci- fications necessary to make the Storm Water Management Ordinance work. 2. A rough draft of the document was sent to consulting engineers in town for an engineering review. It is important to note that we were not seeking nor did we accept suggestions compromising on a:ny of the technical portions of the specifications. Our only intent in sending the document to the consulting engineers was to have them aid us in picking up errors in engineering formulas, technical specifications, etc. 3. The document was returned by the consulting engineers to the City engineering staff. Errors and omissions pointed out by the consulting engineers were incorporated into the documents and a reply was made to consulting engineers either in writing or verbally on suggestions that were not incorporated into the document. Some typical errors and omission and recommendations that were provided by the consulting engineers and our comments to them are listed below: 1. Consulting Engineer Comment: Allow more open ditches as a normal means of carrying flow through subdivisions. City Reply: Not accepted. Open channel -flow except in a very few instances creates erosion problems, aesthetic problems, mosgr3ito problems, etc. 2. Consulting Engineer Comment: The Ven Te Chow method of storm watez storage calculations is overly conservative. An alternate method was suggested. 863 Neal Berlin and C0Council • Page 2 City Reply: A check of the Ven Te Chow method did reveal that the formula resulted in overly conservative results as more and more of the area under consideration became paved. City Engineering staff provided a cut off of a maximum five inches of storage. 3. Consulting Engineer Comment: The wording in the specifications does not make the design of the overflow spillway clear. City Reply: Specifications rewritten to clarify section referring to overflow spillways. 4. Consulting Engineer Comment: Specifications do not discuss increased discharge rate under some circumstances. City Reply: The ordinance does specify this and since this is a rare exception it was not and will not be included in the specifications. S. Consulting Engineer Comment: In a five year storm the specifications require a 12 foot lane be left free of water on local and collector streets. A suggestion was made to reduce this to nine feet. City Reply: A 12 foot wide lane is the minimum necessary to provide drivers with some feeling of security in driving down a flooded local or collector street. Due to other changes in methods of calculating storm flow, considerably fewer storm inlets will be placed under these guidelines than under previous guidelines. This change in technique and use of only a nine foot clear lane will result in too few storm inlets. The suggestion was not accepted. 6. Consulting Engineer Comment: Allow use of corregated metal pipe with coatings. City Reply: Noz accepted. Corregated metal pipe, regardless of coating, finally does deteriorate after 20 to 30 years. This simply is not acceptab 1e from a municipal maintenance standpoint. 7. Consulting Engineer Comment: The requirement for two feet of cover over storm sewer pipes under pavement may be difficult to meet. City Reply: The specifications were changed to minimum recommended cover shall be cwo feet. B. Consulting Engineer Comment: An alternate method of hydraulic computation would result in less storage being required. The Ven Te Chow method :is too conservative. City Reply: Rejected, The method proposed by the Consultant had no mathematical or empirical validity. The Ven Te Chow method has been proven in actual construction projects and represents a conservntive, ee>mmnn sense approach consistent with public safety requirements. Neal Berlin and A Council Page 3 9. Consulting Engineer Comment: Several suggestions were received for using slightly different runoff curve numbers. City Reply: Runoff curve numbers are a matter of engineering judgment. City staff believes the numbers in the booklet are reasonable and rational. When the Storm Water Management Ordinance was in its proposal stages, an implicit understanding was made with most land developers that the City staff would attempt to make trade offs to help partially compensate for any increased cost of implementing the Storm Water Management Ordinance. It must be remembered in many cases the Storm Water Management Ordinance will have the same as or less cost than traditional methods, but there are cases in which the cost will be greater. The City Engineering staff believes some trade offs have been made that will aid the developers financially. These are listed below: 1. The Ven Te Chow method of calculating water flows is allowed rather than the Rational Method. This means that storm water inlets can be spaced further apart and can be made smaller. This saves the developer money. 2. On collector and 1 ocal streets, grate type inlets are allowed in place of the curb inlets now required. This has the potential of saving developers from 1/3 to 1/2 the cost of curb type inlets. 3. Existing City standards require only reinforced concrete pipe for storm water pipe. The new specifications allow use of reinforced concrete pipe, clay pipe, or plastic pipe. This has the potential of significantly cutting the cost of acquiring and laying pipe. The Storm Water Specifications Document was not submitted to land developers for review since it is essentially a very detailed technical document. All of the engineering firms that reviewed the document are active in land development work for major developers in the community and it is believed that their statements closely mirror the concerns of developers. In my professional opinion the attached booklet is a superior set of specifications which should serve both land developers and the public well. It is sound from an engineering standpoint, sound from a development standpoint and the document is workable. We have had experience over the last four months with actual subdivision design and the specifications do answer the majority of the problems encountered. The attached document is specification booklet no. 1 of the two booklets required to fully implement the Storm Water Management Ordinance. Booklet no. 2, "Specifications for Soil and Erosion Control" is expected to be presented to Council in approximately four weeks. With adoption by Council these two booklets will signify full implementation of the Storm hater 'Management Ordinance. cc: Land developers 1 1 1 1 ' REVISIONS TO DESIGN STANDARDS FOR PUBLIC WORKS IMPROVEMENTS � IOWA CITY SECTION VII - STORM SEWERS i I 1 1 1 1 I I I Revisions to Design Standards Iowa City, Iowa Section VII - Storm Sewers VII - 1.0 Design Plows for Public Works Improvements Pa 1.1 Estimated storm water flow shall be determined by the use of a hydrograph to predict the peak rate of runoff accumulation and total runoff at a point of investigation. A hydrograph need not be developed for each individual subwat ershed created within a project by the construc- tion o f inlets and drainage. A hydrograph must, however, be developed for each project at the major point of interest, where excess storm water is discharged from dominant land within the project to servient land outside of the project. In the event upstream catchments deliver storm water runoff into the project in significant amounts, examination of this watershed will also be required by the hydrograph method. As an aid to the development of hydrograp hs for drainage analysis, refer to Appendix 'A' of this document. The method detailed in this appendix will be acceptable for use on all projects in Iowa City. 1.2 The storm sewer system for each project shall be designed to transport the rainfall excess from a five (5) year storm. The excess storm water passage shall be designed to transport the peak rate of runoff from a 100 year return frequency storm assuming all storm sewers are inoperative and upstream areas are fully developed, all in accordance with the Iowa City Ordinance re- gulating storm water runoff. 1.3 Both the storm sewer drainage system and the excess storm water passage shall be designed to discharge into a storm water storage facility. The specific location and method of construction of this storage facility may vary in accordance with existing natural drainage conditions and development planning. The complete design and planning of storm water storage facilities must be included with all plans submitted for approval. 1.4 All storm sewers shall be designed with a slope that provides sufficient energy to produce a velocity of 2.0 feet per 5ecund when flowing full. Values of 'N' used in the Kutter's formula for various materials are given in Appendix 'B' of this document. I ILI Revisions to Design Standards for Public Works Improvements ' Iowa City, Iowa Section VTI - Storm Sewers Page 2 VII - 2.0 Storage Requirements 1 2.1 All storm water storage areas must be designed to contain and safely pass storm water runoff. The combined capacity of these storage areas shall be sufficient to contain the storm water runoff from a 100 year storm from the development under design ' with a release rate of 0.15 cfs per acre. Adequate spillway provisions must be constructed to transport peak runoff from a 100 year storm assuming the outlet to be plugged. This spillway shall provide for the entire upstream watershed. A low flow pipe capable of carrying minimal flows shall be put under dry bottom water storage areas ' in those locations where flows from car washing, sump pump drainage and other like uses would be a nuisance to property owners abutting a storage area. Such pipe shall be four (4) inches in diameter unless otherwise approved by the City Engineer. ' 2.2 Where storm water storage facilities have the potential to contain the runoff from the total tributary water- shed they must be constructed to contain the main channel flow and restrict the flow of all of the storm water runoff as opposed to only the runoff from that portion of the watershed containing the project under consideration. Storage volumes should be calculated to contain only the runoff from the project site, however, the release rate must be calculated at 0.15 cfs per acre from the total tributary catchment. Over- flow spillway requirements must be designed to transport peak storm runoff, as stated in Section 2.1, from the entire tributary watershed under the existing conditions. Future upstream storage will not be allowed for purpose ' of design reductions. If the development does not contain main channel flow, I water from upstream development must be piped through the development t o the storage area. now from upstream should be calculated at 0.15 cfs per acre if the upstream watershed will some day be developed. If it is already eevelored cr Can refer be develgpee' actual f2c-v should be calculated end piped for a 5 year storm. All flows for a 100 year storm from upstream, shall be handled by an excess storm water passage. Z.3 In ao case- shall storage in escess of 5 inches per acre be required. ILI I ' Revisions to Design Standards for Public Works Improvements Iowa City, Iowa Section VII - Storm Sewers Page 3 1 ' 2.4 Energy dissipators shall be provided at the discharge points of all storm water storage facilities. These need not take the form of a special structure unless discharging to a t mosnhere into an open channel. ' Hydraulic structures, drop manholes and downstream storm drains may be used to control the potential energy of temporarily stored storm water. ' 2.S Spillway facilities for all storage areas should be accommodated into the design of the proposed improve- ment without an unusual condition or special structure that will other than routine require maintenance. 2.6 For specific information and details on storage ' facilities, including alternative measures, with advantages and disadvantages for reducing and delaying storm runoff, refer to Appendix 'C' of ' this report. VII 3.0 Inlet, Pipe and Storm Sewer Appurtenance Design Standards ' 3.1 Inlets and pipes shall be located and sized so that the following conditions are met: ' a. For a five (S) year storm arterial streets shall have two traffic lanes free of excess water at all times. Local and collector streets shall be designed to have one twelve (12) ft. traffic lane free of water.; however, there will be design leeway to allow a maximum ponding period of ten (10) minutes during the five (5) year storm. Storm water shall ' not cross an intersection but can follow a curb around its radius. ' b. All of the st c rm water runoff from pavement areas other than streets shall be directed toward storm sewer inlets. These inlets shall have a potential ' of being surcharged a maximum of ]4, feet. c. Storm drainage design shall be accomplished so that storm water runoff is not allowed to accumulate into rulumes that eUuld 1,ecome etstructive and so that the majority of excess rainfall is carried in conduits, as opposed to curbs, open ditches or swales. A design ' solution to imrrove efficiency of inlets is shown in Appendix 'D'. d. Ponding of storm water runoff shall not exceed a ' depth of one ( 1) foot in a nedestrian me]] area. 11 11 [1 F 1 1 1 1 1 1 1 1 1 Revisions to Design Standards for Puhl is Works Improvements Iowa City, Iowa Section VII - Storm Sewers Page 4 3.2 For a one hundred (100) ,year storm, the ponding of surface water on local, collector, and arterial streets must not exceed a depth of one (1) foot at the gutter. Plater exceeding one (1) foot shall be designed to overflow into an excess storm water passage. Note that when storing surface water on a street over a sanitary sewer manhole, a water- proof manhole frame and bolted lid will be required (Neenah R -1916-F or equal). 3.3 The drainage and grading design shall be tested and investigated to ensure that in a 100 year return frequency storm the depth of storm runoff in any street, alley or pedestrian mall will not exceed the level of any habitable floor elevation or the elevation of the first floor of any building designed for public use. 3.4 In all plans, a positive overland surface channel must be provided so that excess storm water runoff is safely transported downst ream. This feature must be clearly indicated on the plans. This overland surface channel must be continuous to the storm water storage area or to the main drainage facility where the excess storm water runoff can be safely trans- ported downstream. 3.5 Curb type inlets shall he used for all arterial streets. Crate type inlets will be allowed for local and collector streets (Neenah R-3065 or R-3067, or equal), alleys (Neenah R-4670 grate or R-4781 grate with Neenah R-4899 frame, or equal), rear yards (Neenah R -4340-A or R -4340-B or equal),, and pedestrian malls if storing water (Neenah R-2500 or equal). Appendix 'I" of this document shows these grate inlets and illustrates potential arrangements of inlet and storm drainage facilities for residential subdivision streets. 3.6 Storm drains shall be constructed of reinfcrced concrete pipe (RCP), concrete pipe (C.P), extra -strength vitrified clay pipe (P.SUCP), or plastic pipe (ABS or PVC -SUR 35 or less) as recommended by the •vanufacturer for the purpose intended. Bedding and strength of pipe material will be adequate to support all supeTimposed loads including H-20 live loads on all pavements. The recommended minimum cover on all Storm drains sh ali he two (Z) feet under Pavements and otic (1) foot a nde•r turf arras. I ' Revisions to Design Standards for Pubic works Improvements Iowa City, Iowa Section VII - Storm Sewers Pago 5 All storm drains will be a minimum of four (4) inches in diameter for control of storm runoff from storage areas. Rear yard drainage pipes will be a minimum of six (6) inches in diameter. All others will be a ' minimum of ten (10) inches in diameter. Specifications for acceptable bedding materials and methods of installation are contained in Appendix 'F' of this document. 3.7 Manholes shall be designed and installed as follows: a_ at the end of each line; b_ at all changes in grade, size or alignment except for sewers thirty (30) inches or greater in diameter which may be laid with changes in ' alignment without manholes; C. at all pipe intersections; L1 IL i. so that when a smaller sewer loins a larger sized pipe, the invert of the larger sewer is lowered sufficiently to maintain the snore energy gradient. (An approximate method for securing this result is to place the 0.8 depth point cf both sewers at the same elevation). d. at distances not greater than 400 feet for sewers fifteen (15) inches or less in diameter and 600 feet for sewers eighteen (18) inches to thirty (30) inches (Greater spacing may be permitted in larger sewers and in those carrying a settled effluent); ' e. with a minimum diameter of forty-eight (48) inches; f. with a minimum diameter of twenty-three (23) ' inches for the opening at the top of the manhole; g, so that the flow channel through storm sewer manholes conforms in shape and slope to that of ' the sewers; h. according to the Standard Manholes as shown in ' Appendix 'C'; and L1 IL i. so that when a smaller sewer loins a larger sized pipe, the invert of the larger sewer is lowered sufficiently to maintain the snore energy gradient. (An approximate method for securing this result is to place the 0.8 depth point cf both sewers at the same elevation). I ' Revisions to Design Standards for Public Works Improvements Iowa City, Iowa Section VII - Storm Sewers Page 6 VII - 4.0 Protection of Water Supplies 4.1 There shall be no physical connection between a public or private potable water supply system and a sewer, or ' appurtenance thereto which would permit the passage of any sewage or polluted water into the potable supply. 11 �J VII - 5.0 Proper Backfilling 5.1 Where the sewer crosses an existing or proposed sidewalk or street, the sewer trench shall be backfilled with a suiteble mv.te-tel compacted t^ 9n4 cf Modif=ed Proct^r Density. 5.2 When using reinforced concrete pipe (RCP), Class 'C' bedding will be used unless severe subgrade conditions are encountered ir. whicl, case the l:neinee;r SAml) direct Class 'B' bedding to be used. When using extra -strength vitrified clay pipe (PSVC:P), concrete pipe (CP), or plastic pipe Class '13' bedding will be used. 4.2 Whenever possible, sewers should be laid at least ten (10) feet horizontally from any existing or proposed water main. Should local conditions prevent a lateral separation of ten (10) feet, a sewer may be laid closer than ten (10) feet to a water main, provided: 4.2.1 it is laid in a separate trench; 4.2.2 it is laid in the same trench with the water mains located at one side on a bench of ' undisturbed earth; or 4. 2.3 in either case the elevation of the crown of the sewer is at least 18 inches below the ' invert of the water main. 4.3 Whenever sewers must cross under water mains, the sewer shall be laid at such an elevation that the top of the ' sewer is at least 18 inches below the bottom of the water main . ' 4.4 When the elevation of the sewer cannot be buried to meet the above requirements, the water main shall be relocated to provide this separation or reconstructed with slip-on or mechanical joint cast iron pipe, for a distance of ten (30) feet on each side of the sewer. One full length of water main should be centered over the sewer so that both joints will be as far from the sewer as possible. 11 �J VII - 5.0 Proper Backfilling 5.1 Where the sewer crosses an existing or proposed sidewalk or street, the sewer trench shall be backfilled with a suiteble mv.te-tel compacted t^ 9n4 cf Modif=ed Proct^r Density. 5.2 When using reinforced concrete pipe (RCP), Class 'C' bedding will be used unless severe subgrade conditions are encountered ir. whicl, case the l:neinee;r SAml) direct Class 'B' bedding to be used. When using extra -strength vitrified clay pipe (PSVC:P), concrete pipe (CP), or plastic pipe Class '13' bedding will be used. I h I Revisions to Design Standards for Public Works Improvements Iowa City, Iowa Section VII - Storm Sewers page 7 Class '11' and Class 'C' beddings for all types of pipe allowed are illustrated in Appendix 'F' of this document. 5.3 If granular material is used for backfilling, all concrete pipe storm sewer joints shall be sealed with asphaltic material. VII - 6.0 Open Channel Flow 6.1 All storm drainage shall be carried in paved channels (curb and gutter) leading to an enclosed storm sewer. Open channel flow, when permitted under special circum- stances specifically approved by the City Engineer, must be designed to accommodate the storm runoff from a 100 year return frequency storm. This runoff will be calculated by examination of the total tributary watershed. 6.2 All open channel flow shall be accomplished within dedicated rights-of-way or in acceptable easements approved by the Iowa City Engineer. Acceptable methods of controlling channel erosion will be followed. A11 ow - able flow rates for various materials are contained in Appendix 'H' of this document. Where velocities approach the maximum value, special provisions shall be made to protect against displacement, erosion or shock. 6.3 Maximum backslope shall be 4:1 in combination with good soil erosion techniques. VII - 7.0 General 7.1 When preliminary plats are submitted, an additional two copies of the plat shall be submitted to Engineering which have been hand marked showing the proposed sto r nge areas and volumes. Preliminary calculations supporting the volume requirements for the entire subdivision or PAD shall accompany these plans. It is not intended that a final design be submitted; however, it will be necessary to show that sound consideration has been given to the accommode tion of storm water management. This Stei should nee` chengee^r. the final construction drawings. 7.2 Final construction drawings shall be accompanied with all calculations supporting, the storm water management desirn as well as prornsed •iethods rag erosion control. These drawings shall be approved prior to final plat approval. 1 1 1 1 1 1 I 1 j 1 I Appendix 'A' I ' Revisions to Design Standards for Public Works Improvements Iowa City, Iowa Section VII - Storm Sewers Appendix 'A' 1 ' A. Instructions for hydrograph preparation using modified method according to Chow.* 1 1 -1 1. Establish a composite runoff number 'PI' for the watershed under consideration by using Table A-1. Record data on the hydrologic studies form under land use. Composite runoff numbers resulting in a fraction can be rounded off to the nearest whole number. 2. From Table A-2 interpolate and establish a runoff factor 'x' for each time distribution and frequency up to the limits of the hydrologic studies chart. Check to see that the value recorded on the form is correct for the assigned time, frequency and runoff number. 3. Establish the slope and length of the stream from available topographic data. Use Figure A-3 to establish a lag time in hours and record all data on the form in the appropriate locations. ' 4. Compute the ratio of time/lag time (T/Tp) and record on the hydrologic studies form. S. From Figure A-4 determine the appropriate 'z' factor for t each computed T/Tp value. Record these values in the column on the hydrologic studies form. ' 6. Multiply the following factors to establish a quantity of in -flow for each time and frequency. Record the answer in each appropriate space on the hydrologic studies form. ' Multiplication factors: Basin Area (in acres) X ' Climate Factor (1.19) X Frequency Factor ('x' value) X Peak Reduction Factor ('z' value) Q V I 7. Determine the largest in -flow value and establish incre- ments for the Quantity that will contain all rates of in -flow. Recon Hese increments on the hydrologic studies form and using the data developed fry "o", plot the curves for the various frequency storms. `Ven Te Choi:'. 'WYdYf<2nr;c Jieterr'lnetjvr of Wctcr%,1%, Arco!; fc'r Thr Design of Drainage Structures in Small Drainage Basins", Engineering Experiment Station. Bulletin No. 462 TAIILU A- I: SO11, COVI:lt- ItUNOI'P NUMBER 'N' LAND USE DESCRIPTION HYDROLOGIC SOIL GROUP — A B C D Cultivated land: without conservation treatment 72 81 88 91 with conservation treatment 62 71 78 81 Pasture or range land: poor condition 68 79 86 89 : good condition 39 61 74 80 Meadow: good condition 30 58 71 78 Wood or Forest land: thin stand, poor cover, no mulch 45 66 77 83 good cover 25 55 70 77 Open Spaces, lawns, parks, golf courses, cemeteries, etc. good condition: grass cover on 75% or more of the area 39 60 74 80 fair condition: grass cover on 50% to 75% of the area 49 68 79 84 Commercial and business areas 95 (85% impervious) 89 q2 q4 Industrial Districts (728 impervious) 81 88 91 93 Residential: Average lot si:e Average 4 Impervio-_is 1/8 acre or less 65 77 85 90 92 1/4 acre 38 t,] 75 83 87 1/3 acre 30 57 72 81 86 1 / Z LIC re 2S 54 ^0 80 85 1 acre 0 51 08 79 84 LAND USE• DESCRIPTION Paved parking lots, roofs, driveways, etc. Streets and roads: paved with curbs and storm sewers gravel dirt HYDROLOGIC SOIL GROUP A B C D 100 100 100 100 100 100 100 100 76 85 89 91 72 82 87 89 1 TAB LH A-2: RUNOFF FACTOR 'X' vs. 5, 10, 25, 50 f, 100 YI:AR 171ZFQUliNCY ' Computation of Runoff Factor X for 5-Year Frequency Dura- Rain- Runoff Factor X for N equal to tion fall 100 9S 90 85 80 75 70 65 60 in lirs, in in. (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) 0.10 0.20 0.55 0.85 5.50 4.25 3.00 2.50 1.50 1.30 0.40 0.70 0.00 0,25 0.00 0.00 0,00 0,00 0,00 0.00 ... 0.30 1.07 3.67 2,20 1,20 0.77 0.37 0.07 0,00 0.00 ... 0.40 1.19 2.98 1.88 1.15 0.73 0.40 0.13 0.03 0.00 ... ' 0,50 1.31 2.62 1.72 1.08 0.70 0.42 0.18 0.08 0.00 ... 0.75 1.53 2.04 1.39 0,93 0.63 0.41 0.23 0,13 0.04 1.00 1.68 1.68 1.18 0.82 0.57 0,38 0.23 0.14 0,07 ... 1.25 1.78 1.43 1.02 0.72 0.50 0.35 0.21 0,14 0.07 ... 1.50 1.87 1.25 0.90 0.65 0.45 0,32 0.20 0.13 0.07 2.00 2.02 1.01 0.76 0.55 0.40 0.29 0.20 0,13 0.08 ... ' 2.50 3.00 2.11 2.20 0.84 0.73 0,64 0.57 0.46 0.42 0.35 0.32 0.26 0.23 0.17 0.16 0.11 0.11 0.08 0.07 ... 4.00 2.35 0.59 0,46 0.35 0.26 0.20 0.14 0,10 0.07 ... 5.00 2.46 0.49 0.40 0.30 0.23 0.17 0.12 0.09 0.06 ... ' 6.00 2.56 0.42 0.34 0,26 0.20 0.16 0.11 0,08 0 .06 ... 7.00 2.67 0.38 0.31 0,24 0.18 0.14 0.10 0.08 0.07 8.00 2.72 0.34 0,27 0,12 0.17 0.13 0.09 0,07 0.05 ... Computation of Runoff Factor X for 10-Year Frequency ' Dura- tion Rain- fall Runoff 100 95 Factor 90 X for 85 N equal to 80 75 70 65 60 in hrs, in in, (1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) 0.10 0.63 6.30 3.50 1.60 0.60 0,00 0.00 0,00 0.00 0.00 ' 0.20 0.99 4.95 3.00 1.70 1.00 0.50 0.00 0.00 0 .00 0.00 0,30 1.22 4,07 2.57 1.53 1.00 0,57 0.17 0.07 0 .00 0.00 0.40 1.40 3.50 2.35 1.50 1.00 0.63 0.30 0.13 0.00 0.00 ' 0.50 1.63 3.26 2,26 1.54 1.06 0.70 0.40 0,24 0.10 0.00 0.75 1.76 2.35 1.67 1.16 0.83 0.56 0.35 0,22 0.11 0.00 1.00 1.92 1.92 1.40 1.00 0.75 0.52 0.33 0.21 0 .13 0.07 1.25 2.04 1.63 1.22 0.88 0.66 0.46 0.32 0.20 0.13 0.06 1.50 2.14 1.43 1.09 0.80 O.bO U.44 0.30 0,20 0.13 0.07 2.00 2.26 1.13 0.87 0.65 0.49 0,38 0.25 0.18 0 _12 0.07 2,50 2.37 0,95 0.75 0.56 0.42 0,32 0.22 0.16 0.10 0.06 ' 3.00 2.4b 0.82 0.65 0.50 0.38 U.29 0.21 0,14 0 .10 0.06 4.00 2.61 0.65 0.52 0.41 0.31 0.24 0.18 0.13 0 .09 0.06 5,00 2.72 0.54 0.44 0.38 0.27 0.21 0.15 0.11 0.08 0.05 ' 6,00 2.82 0.47 0.38 0.30 0.23 0,19 0.14 0,10 0.OR 0.04 7.00 2.90 0.41 0,34 0.27 0.21 0.17 0.12 0.09 0_07 0.04 8.00 2.99 0,37 0.31 0.25 0.19 0.16 0,12 0.08 0_07 0.04 f I 1 I 1 1 [1 I I Dura- Computation Rain- of Runoff Factor X for 2S -Year Frequency 1630 tion fall 100 Runoff 95 Factor X for N equal to 3.76 2.57 1.87 in hrs, in in, 2,40 2.05 go 85 80 75 70 65 60 0.10 0(73 7330 4410 2510 1600 0720 0800 0900 (0.00 (0100 0.20 0.30 1.17 5.85 3,70 2.20 1.40 0,80 0,20 0,00 0,00 0.00 0,40 1.47 1.66 4,90 4,15 3.33 2,90 2.17 2.00 1.47 1.38 0,93 0.95 0.50 0,27 0.08 0.00 0.50 0,75 1.81 3.62 2,66 1. 84 1.32 0,92 0,55 0,56 0,35 0.36 0.15 0,20 0.08 0.12 1.00 2,08 2.24 2,77 2.24 2,11 1,73 1.53 1. 28 1.14 0,97 0,83 0,57 0.36 0.23 0.17 1.25 2.36 1.89 1,48 1,11 0,84 0.72 0,64 0.50 0,44 0.34 0,31 0,22 0,21 0.18 0.12 1.50 2.00 2.45 2.61 1.63 1.31 1.29 1,02 0.98 0,75 0,57 0.41 0.29 0.20 0.12 2.50 2.72 1,09 0.88 0. 78 0.68 0.61 0.53 0,47 0,42 0,34 0.30 0.24 0,22 0,17 0.10 3.00 4,00 2.77 2.93 0.92 0,75 0.59 0,45 0.36 0.27 0,19 0,16 0,14 0.10 0.09 5,00 3.04 0.73 0.52 0,60 0.50 0.48 0. 41 0,38 0,32 0,30 0.22 0.16 0,12 0,08 6.00 7.00 3.14 0.52 0,43 0.35 0,29 0.25 0.22 0,20 0.18 0.15 0,13 0.11 0,09 0,07 0.08 8.00 3.22 3.31 0,46 0.41 0,38 0,34 0. 31 0.28 0,25 0,23 0,20 0.15 0.11 0,09 0.06 0.19 0,14 0,11 0,08 0,06 Dura- tion in hrs. (1) 0,10 0,20 0,30 0.40 0,50 0,75 1 .00 1 .25 1 .50 2.00 2 .50 3.00 4.00 5 .00 6.00 7.00 8.00 Computation of Runoff Factor X Rain Runoff Factor X for fall 100 95 90 85 in in. for 50 -Year Frequency N equal to 80 75 70 65 60 8380 4480 0900 0.83 1630 2550 1.31 6.55 4,25 2.65 1.64 5,47 3.76 2.57 1.87 4.68 3.37 2,40 2.05 4.10 3.05 2.24 2.34 3.12 2.44 1.83 2,54 2,54 2,02 1.5S 2.66 2,13 1.71 1,34 2.77 1.85 1,49 1.18 2,90 1.45 1,18 0.95 3.02 1.21 1,00 0.81 3.09 1.03 0,85 0.69 3.24 0,81 0,68 0,55 3,36 0,67 0,56 0,46 3.46 0,58 0,49 0,40 3,53 0,51 0,43 0,36 3.62 0,45 0,39 0,32 for 50 -Year Frequency N equal to 80 75 70 65 60 0750 0800 0900 1630 0100 0 100 1,65 1.05 0,40 0.15 0,00 O 1,77 1.20 0.67 0.40 0,17 .00 0 1.75 1,20 0,75 0.50 0,25 .00 0 1,66 1.30 0,80 0,54 0,34 .18 O .20 1.39 1,07 0,73 0,51 0,35 0.20 1,18 0,92 0,66 0,47 0,33 0 1,03 0.80 0,58 0,42 0.30 .20 0 0,92 0,71 0,53 0,39 0,28 .18 0-18 0,87 0,58 0,44 0,33 0,24 0 0,64 0,51 0,39 0,29 0,21 .15 0-14 0.55 0.44 U.34 0.25 0,20 0 0.45 0.36 0,28 0,27 0,16 .13 0.17 0,37 0,31 0,24 0,18 0,14 0- 30 0,32 0.27 0.27 0.16 0,12 0_09 0.29 0.24 0,18 0.15 0,17 0_08 0,26 0,21 0,17 0.13 0,10 0_08 I 11 I 11 1 [] Ii 1 Dura- tion in hrs (1) 0.10 0.20 0.30 0.40 0.50 0.75 1.00 1.25 1.50 2.00 2.50 3.00 4.00 5.00 6.00 7.00 8.00 Computation of Runoff Factor X for 100 -Year Frequency Rain- Runoff Factor X for N equa to fall 100 95 90 85 80 75 70 65 60 in in. (2) (3) (4) (S) 0.91 9.10 5.50 2.90 1.42 7.10 4.75 3.00 1.80 6.00 4.33 3.03 2.03 5.08 3.83 2.75 2.24 4.48 3.48 2.60 2.56 3.41 2.72 2.11 2.77 2.77 2.24 1..77 2.89 2.31 1.89 1.50 3.01 2.01 1.65 1.33 3.20 1.60 1.33 1.09 3.28 1.31 1.10 0.91 3.41 1.14 0.95 0.79 3.58 0.90 0.76 0.64 3.66 0.73 0.62 0.52 3.79 0.63 0.54 0.46 3.86 0.55 0.47 0.40 3.95 0.49 0.42 0.36 (6) (7) (8) (9) (10) (11) 1.60 0.60 0.00 0.00 0.00 0.00 2.00 1.25 0.60 0.30 0.00 0.00 2.17 1.50 0.93 0.57 0.33 0.17 2.03 1.50 1.00 0.63 0.40 0.23 1.94 1.66 1.00 0.70 0.46 0.26 1.63 1.27 0.89 0.65 0.47 0.28 1.38 1.07 0.80 0.58 0.42 0.27 1.18 0.94 0.70 0.52 0.38 0.25 1.05 0.83 0.65 0.47 0.35 0.23 0.88 0.70 0.55 0.41 0.31 0.21 0.73 0.59 0.46 0.34 0.26 0.18 0.64 0.52 0.41 0.31 0.24 0.17 0.52 0.4 3 0.34 0.26 0.20 0.15 0.43 0.35 0.28 0.22 0.17 0.12 0.38 0.31 0.25 0.20 0.15 0.11 0.33 0.27 0.22 0.17 0.14 0.10 0.30 0.25 0.20 0.16 0.13 0.09 I I 1 1 11 I �i APPENDTX 'A' 8. Calculate the capacity of the drainage system under various hydraulic conditions or establish an acceptable release rate (0.15 cfs per acre maximum). Plot the value on the form so that it forms an overlay of the curves established in paragraph 7 above. 9. Determine the area between the various frequency curves and the release rate for an eight (8) hour storm measured in square inches. Establish the volume of storage contained in one (1) square inch by multiplying the appropriate value of quantity and time with conversion factors to produce the answer in acre feet. Calculate the storage requirement by multiplying the area between the curves by the conversion factor to produce acre feet. Record the required volume of storage in the appropriate column on the hydrologic studies form for the various frequency storms. 10. These values represent an estimate of the volume that should be provided to contain excess storm water runoff from the various return frequency storms. While a rigorous examination of the method will indicate that it is a con- servative approach to predicting excess storm water runoff, it is straight forward and the results are within acceptable limits. B. Determination of estimated recurrence. 1. Determine percentage of runoff or use information on com- posite 'N' value from the hydrologic studies form. Compute the average runoff and record values on the spaces adjacent to 'Impervious Average Runoff' in the second column of the estimated recurrence form. 2. The annual number of events for the Iowa City area and the recurrence interval were computed from an analysis of rain- fall events using Ralston N2 records of the U.S. Weather Bureau. This data could be further refined by using addi- tional records, however, for this purpose the six (6) year period should be adequate. The estimated average duration of the storn, was established to match the rainfall inten- sity vs. duration curves found in Figure A•5. 3. Examination of the proposed control structure used to regulate the discharge of storm water runoff from a storage area 1,11l hn-C a srecif:c relr:ase rate tial -car. fit *:Oc rtee. The quantity of storm runoff released will vary, depending on the head available from the excess storm water being st ored. This variation should be minimized and the design modified so that it becomes as uniform as Possible. Divide tT--�• (rUBrltjly of C'ischrrIrr to tf:e wcree ve heinv lraine•d, this will be expressed as cfs/acre. v'ithin a factor of n.83t this value is equal to inches/hour. Multiply this value by I I I I II the estimated average duration and record the answer in the appropriate space in column 7, headed 'Average Runoff (in.) Released.' 4. Subtract the value recorded in column 7 from the value ' recorded in column 2 and place the answer in the appropriate space in column 8. 5. Convert the figures in column 8 into acre feet by multiply- ultiply- ing ing by the catchment area in acres and dividing by 12. Record the answer in column 9. G. Examine the proposed storm water storage basin and calcu- alcu- ' late late the volume of storage being provided vs. the depth of storage. Determine appropriate values for the storage ' elevation and volume in a cre feet to utilize the total grid pattern in the lower left hand portion of the form. Plot specific conditions of the storage facility on this grid and connect with a best -fit curve. 7. Review the data contained in column 9 and establish reference points on the curve for significant storms, e.g. 808 annual, 5-10 year, 25-50 year, 100 year. Designate these ' points on the curve for reference. ' B. Calculate the hours needed to drain the storage basin at the release rates established for column 7. Determine appropriate values to utilize the total grid system in the lower right portion of the form and plot a curve of best— est— fit fit for these values. Again examine the data in column 9 and establish reference points on this curve for the same significant storms. ' 9. These data can be used to establish flood limits for various storms., determine overflow events, and explain the duration ' of storage for various storms. It should be noted that the majority of storms will require little or no storage, and that storage will be required for extremely brief periods following the storm. I I II Revisions to Design Standards for public Works Improvements Iowa City, Iowa Section VII - Storm Sewers Appendix 'B' Values of N to be used with Kutter or Manning Formulas* Condition Type of Surface New Good -fair Poor Cast iron pipe 0.013 0.014 0.015 0.020 Wrought iron pipe 0.013 0.014 0.015 0.016 Brass or glass pipe 0.009 0.010 0.011 0.013 Smooth plastic pipe** 0.010 0.011 0.012 0.013 Riveted spiral steel pipe 0.013 0.015 0.017 0.019 Corrugated metal pipe** 0.020 0.025 0.027 0.030 Concrete pipe 0.013 0.015 0.017 0.020 Vitrified clay pipe 0.013 0.014 0.015 0.018 Common clay pipe 0.013 0.015 0.017 0.020 Asbestos cement pipe** 0.013 0.014 0.016 0.018 Concrete lined channel 0.013 0.014 0.016 0.018 Rubble lined channel 0.017 0.020 0.025 0.030 Straight earth channel 0.017 0.020 0.023 0.025 Winding earth channel 0.022 0.025 0.028 0.030 Dredged earth channel 0.025 0.027 0.030 0.033 Earth bottom. rubble side channel Clean, straight natural stream Weedy, straight natural ttreaai Winding, clean natural s t ream tund.r�g, wcetij ualural stream 0.028 0.030 0.033 0.035 0.025 0.017 U.U3U 0.033 0.033 0.035 0.030 0.033 0 .035 0.040 0 .040 0.045 0.035 0,040 0 .045 ().()50 TvDe of Surface Sluggish, large natural stream Sluggish, weedy natrual stream Condition New Good it Poor 0.050 0.060 0.070 0.080 0.075 0.100 0.125 0,1S 0 *Adapted from Handbook of Applied Hydraulics, by C. V. Davis, Table compiledTy Orton. **Values from manufacturer's recommended design factors. I I I 1 I I I I I 1 1 Appendix 'C' I ' Revisions to Design Standards for Public Works Improvements Iowa City, Iowa Section VII - Storm Sewers Appendix 'C' 1 Acceptable storage of excess storm water runoff may be accomplished ' in numerous ways. Each of these methods should be examined to pro- vide the specific project with the maximum advantage, least cost of construction and minimum of inconvenience. 1 1 II 1 To aid in the design of acceptable measures for reducing and delaying urban storm runoff in Iowa City the following grouping of methods and accompanying advantage and disadvantage list has been excerpted from the Soil Conservation Service Technical Release No 55. These methods are listed to provide a point of reference for investigating alternative means of compliance with the Iowa City Storm Water Control Ordinance. The disadvantages of each control method are listed for the primary purpose of providing both the design and review engineer with data to investigate each control measure used, and develop an acceptable solution for each potential difficulty. In all of these recommended measures, the matter of economic construction should be stressed. Economics in construction does not mean the use of insufficient materials or reduced quality, but additional investigation of alternatives is required to determine the most efficient and acceptable use of the materials and resources available on the construction site. ' Methods used to control runoff in urbanizing areas reduce the volume and/or the rate of storm water runoff. The effectiveness of any control method depends upon the availability of potential storage, the inflow rate and the outflow rate. Because a great ' variety of methods can be used to control peak storm water flow, each method suggested should be evaluated for both effective- ness and acceptability for the given project. Effective and accep- table measures for reduction of peal: runoff rates are, of course, not limited to those listed. ' The details for the construction of each method suggested are most important. These details should be carefully examined to ensure that greater problems are not created by the construction of a control device than are solved. II I I u AREA Large flat roof MEASURES FOR REIIUCING AND DELAYING URBAN STORM RUNOFF REDUCING RUNOFF 1. Cistern storage 2. Pool or fountain storage Parking lots 1. Porous pavement 2. Concrete vaults and cisterns beneath parking lots in high value areas 3. Vegetated ponding areas around parking lots 4. Gravel trenches Residential 1. Contoured landscape 2. Ground -water recharge a. perforated pipe b. gravel (sand) c. trench d. porous pipe e. dry wells 3. Vegetated depressions DELAYING RUNOFF 1. Ponding on roof by constricted downspouts 2. Increasing roof roughness a. rippled roof b. gravelled roof 1. Grassy strips on parking lots 2. Grassed waterways draining parking lot 3. Ponding and detention measures for inpervious areas a. depressions b. basins 1. Reservoir or detention basin 2. Planting a high delaying grass (high roughness) 3. Grassy gutters or channels 4. Increased length of travel of runoff by means of gutters, diversions, etc. ADVANTAGES AND DISADVANTAGES OF MEASURES FOR REDUCING AND DELAYING RUNOFF MEASURE ADVANTAGES DISADVANTAGES A. Cisterns and covered ponds B. Surface pond storage (usually residential, commercial and industrial areas) ,C. Ponding on roof by con- stricted downspouts D. Increased roof roughness 1. rippled roof 2. gravel on roof 1. Water may be used for: a. fire protection b. watering lawns C. industrial processes d. cooling purposes 2. Reduce runoff while only occupying small area 3. Land or space above cistern may be used for other purposes 1. Controls large drainage areas with low release 2. Aesthetically pleasing 3. Possible recreational benefits a. boating b. ice skating C. fishing d. swimming 4. Aquatic life habitat S. Increases land value of adjoining property 1 . Runoff delay 2. Cooling effect for building a. water on roof b. circulation through 1. Runoff delay and some re- duction (detent i en ii; ripples or grnvell 1. 2. 3 4 5 Expensive to install Cost required may be restrictive if the cistern must accept water from large drainage areas Requires expensive cleaning and maintenance Restricted access Reduced available space in basements for other uses. 1. Requires advance land planning 2. Possible pollution from storm water and siltation 3. Must be deep enough (+101) to support fish life to prevent mosquito breeding 4. May have excessive algal blooms resulting in eutrophication S. Maintenance problems with land/ water interface 6. Potential liability 1. Higher structural loadings or greater flexure under loads 2. Clogging of constricted inlet requiring maintenance 3. Freezing during winter (expans 4. Potential for leakage of roof (water damage) I. Somewhat higher structural IOudingb 1. Ili phcr lint cntial for louks DISADVANTAGES MEASURE ADVANTAGES E. Grassed channel and vegetated 1. Runoff delay 1. Requires use of some land area for vegetated strips strips 2. Some runoff reduction (infiltration recharge) 2. Grassed areas must be mowed cut (main 3. Aesthetically pleasing o r periodically costs) a, flowers 3. to mance Increased difficulty of cleaning b. trees 1. Somewhat restricted movement of F. Ponding and detention 1. 2. Runoff delay Runoff reduction vehicle measures on impervious 2. Interferes with normal use pavement during heavy runoff periods 1. basins 3. Depressions collect dirt and 2. constricted inlets debris requiring extra main- tenance. detention 1. Runoff delay 1. Advance land planning is G. Dry reservoir or 2. Recreation benefits -baseball necessary basin football, etc., if land is 2. Maintenance costs provided a. Mowing grass b. Herbicides 3. Aesthetically pleasing could control large drainage c . Cleaning periodically 4, areas with low release 3. (silt removal) May require underdrain system 4, siltation H. Ground -water recharge 1. Runoff reduction (infiltra- 1. Clogging of pores or perforated 1, perforated pipe or 2. tion) Ground -water recharge with Z. pipe of installation 1 nttial expense hose 2, french drain relatit•ely clean water to or 3. (materials) Monitoring of water quality, if 3, porous pipe 3, supply water garden May y PP )' g required could prove expensive 4, dry well 4. dry areas !=t!]e evaporation loss I. Routing flow over law n 1, Runoff delay 1, possible erosion or scour, ,;hich requires added expense 2. Increased infiltration to accomplish standinggwater on lawn in 3. Fa<y dr,pr(•ss oos in poorly traded ,, rru:• f•oteutiol for ice build-up II 1 1 1 1 I 1] 1 Appendix 'D' REVISIONS TO DESIGN STANDARDS FOR PUBLIC WORKS IMPROVEMENTS IOWA CITY, IOWA SECTION = - STORM SEWERS APPENDIX 752.9 748.0 EXISTING GRADE - 755 BEST FIT UNIFORM GRADE 4'/350' = 1.14% / 0 C; n � 750 TYPICAL STORM DRAIN SYSTEM o LOW 0 * Q%�WATER MAIN + W/5' COVER 1Q 745 � d 0 50 100 150 200 250 300 350 STREET GRADE - ALLOWING EXCESS FLOW TO REMAIN IN STREET CHANNEL II 1.79 0% -1.50' +3.00' 765^ 752 4POINT REVERSE STREET GRADE - REQUIRING EXCESS FLOW TO SURCHARGE STORM DRAINAGE SYSTEM 9 TEMPORARILY STORE 'IN THE STREET THESE REVERSE GRADES SHOULD BE CREATED TO EXAGGERATE THE NATURAL VARIATIONS IN THE EXISTING TOPOGRAPHY AND MINIMIZE THF EFFECT ON ROADWAY RIDE. LOCAL STFttETS WILL GENERALLY NOT M AFtECY"ED 01 C"ANGEC OF 5% TV C% H' PROPER VERTICAL CURVES ARE CONSTRUCTED. 0 EXISTING GRADE -7!I'-0" HEADFOR n STORM DRAIN �- SURCHARGE o r FLOW 0 n O n WATER MAIN n ai W/ 5' COVER d q 0 50 100 150 200 250 500 350 REVERSE STREET GRADE - REQUIRING EXCESS FLOW TO SURCHARGE STORM DRAINAGE SYSTEM 9 TEMPORARILY STORE 'IN THE STREET THESE REVERSE GRADES SHOULD BE CREATED TO EXAGGERATE THE NATURAL VARIATIONS IN THE EXISTING TOPOGRAPHY AND MINIMIZE THF EFFECT ON ROADWAY RIDE. LOCAL STFttETS WILL GENERALLY NOT M AFtECY"ED 01 C"ANGEC OF 5% TV C% H' PROPER VERTICAL CURVES ARE CONSTRUCTED. REVISIONS TO DESIGN STANDARDS FOR PUBLIC WORKS IMPROVEMENTS IOWA CITY, IOWA SECTION = - STORM SEWERS APPENDIX 'E' B L PIPE LAID SHALLNOT PARALLEL LUNDER DTHE STREET PAVING. Hill" -- -- A / w W / R LOCAL STREET I I 1 4_j c, L I A i STORM SEWER STORM SEWER AT INTERSECTION PARALLEL AT STREET � w I I i .1 I B N ILS C J I G 1 WI STORM SEWER PERPENDICULAR TO STREET INLET NOTES; I. FLOWS ALLOWED TO PROCEED AROUND COR- NER TO SUMP AWAY FROM INTERSECTION 2. FLOWS NOT ALLOWED TO CROSS INTER- SECTION 3. DISTANCE BETWEEN MANHOLES NOT TO EXCEED 400 FEET 4. NO INLETS BETWEEN PTR IN RADIUS B. M - MANHOLE G - GRATE INLET OR INLET MANHOLE C - CURB INLET SIDE WALK ,/ PROPERTY 1- LINE - SECTION B - B CURB INLET& LOCATED TO KELP TWO It FOOT LANE$ FREE OF WATER IN A 5 YEAR STORM. MANHOLE ,GRATE INLET ROADWAY SECTION A - A ORATE INLETS LOCATED TO KEEP ONE 12 FOOT LANE FREE OF WATER IN A 5 YEAR STORM. I 0 N I 2 i O x 0 m C1 z O O O O M CAL STREET r --CURB ATE INLET CURB INLET FRAME, REVERSIBLE ORATE 6 CURB BOX TO BE NEENAH R-3065 & CURB BOX TO BE NEENAH R-3067 OR APPROVED EQUAL OR APPROVED EQUAL GRADE GRADE I/BEHIND //BEHIND I CURB (CURB GRADE 'o e STREET GRADE O GROUT FRAME �' ° TO WALL ° WALLS TO BE 6" o' POURED CONCRETE - o' ` O OR PRECAST RE- ' _ RIE - IN CON- a CRETE 6ECTIONbO VERT. 6 NOR, "MIN.COVEP. ' s .�.G'. .0 .' O, '. o" f Via' �: a.'.. o.•a' . - B" 6ANO CUGNION - SECTION A -A i' I {� i I CURS `. i AA 1 O I 1 I 1 II I I O I I 1 I I I l � i i CURB INLET FRAME, REVERSIBLE GRATE S -- CURB BOX TO BE NEENAH R-3065 OR APPROVED EQUAL TYPICAL STREET INLET MANHOLE GRADE BEHIND CURB STREET GRADE BRICK OR CONCRETE AS REQUIRED '•;°; ,'. o• TO MAX. OF 4" TO MEET STREET ?': •.' •':° GRADE LINE. 24" MAX. HEIGHT 6.OF SPACER RINOS, IN- OROUT FRAME TO �:0 2'-0" MIN. ''' •� • •• '''.o,• CLUDING C.I. CURB SPACER RING OR •o••• .°•'•".D '•'O'''r INLET FRAME. MANHOLE WALL FLAT TOP _ CEMENT MORTAR JOINTS WITH RUBBER GASKET o AS SHOWN OR COLD BI- I. TUMINOUS COMPOUND .e JOINTS MADE tN SAME MANNER AS SEM'ER PIPE JOINTS WITH 43" STRIP MASTIC PAINT AROUND .o OUTSIDE OF JOINT. 0 STEPS TO BE SPACED AT 12" MIN. TO 16" MAX. FOR STEP o. DETAIL SEE APPENDIX V. •.i STEPS ARE NOT 'REQUIRED IF MANHOLE IS THAN E �• FEET IN DEPTH. FOR 24" PIPE O UN 6' DIA. FOR OVER 24` PIPE SLOPE I` TO 10o 48" PRECAST CON- CRETE SECTIONS CON- FORMING TO A.S.T.M. SPECIFICATION C-78 SECTION A -A A d ❑ 0 t A 17 ❑❑❑� L ❑❑❑1100 ' °• Cl El ❑❑00 v11ao�� TYPICAL PEDESTRIAN MALL INLET FRAME B GRATE TO BE NEENAH R-2500 OR AP- PROVED EQUAL ~4 BARSIN 12"C. -C. HORIZ. 6 VERT, 3" MIN. COVER, A B TYPICAL REAR YARD INLET BEEHIVE GRATE TO BE NEENAH R-4340 A OR R-43408 WITH C.I. FRAME OR APPROVED EQUAL • �' GROUT FRAME ' . ' ' °• z . TO WALL •' •o. _ .. _ � WALLS TO BE S" 'O•• '� 0 o' POURED CONCRETE., 2-0 DIA. N .o OR PRECAST RE- INFORCED CON- • CRETE SECTIONS a , • 2 -0" DIA. B" $AND CUSHION SECTION A -A SECTION 9 - 9 GRADE B I I 1 1] I 1 I t II II VARIABLE LENGTH VARIABLE LENGTH 1 � i I I A I I I I I I I I I � I I � NEENAH R-4670 OR R-4761 GRATE WITH TYPICAL ALLEY INLET NEENAH R-4699 FRAME OR APPROVED EQUAL �11M A PAVEMENT M G '4 BARS! 12" C. -C. O VERT. 6 HORIZ. D"MIM. 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M TA►CPCO INLET I 11 1] I 1 REVISIONS TO DESIGN STANDARDS FOR PUBLIC WORKS IMPROVEMENTS IOWA CITY, IOWA SECTION 3=- STORM SEWERS APPENDIX 'F' 12 IN. MIN. NOTESs I. PIPE SHALL BE LAID ON UNDIS— TURBED SOIL. 2. BELL HOLES SHALL BE HAND SHAPED SUCH THAT THE BARREL OF THE PIPE LIES ON UNDISTURBED SOIL. 3. BACKFILL SHALL BE HAND TAMPED UP TO 12 INCHES ABOVE THE TOP OF THE PIPE. CLASS "C" BEDDING FOR RCP PLACED BACKFILL ,o• ••kD/2 T e a o • ° • • . ° ° •. COMPACTED O11A1Al10.R UNDISTURBED MATERIAL SOIL NOTES, I. PIPE BEDDING SHOULD BE LAID ON COMPACTED GRANULAR MATERIAL WHICH IS TO BE PLACED OVER UN- DISTURBED SOIL. 2. BELL HOLES SHALL BE HAND SHAPED SUCH THAT THE BARREL OF THE PIPE LIES ON COMPACTED BEDDING. 3. BACKFILL SHALL BE HAND TAMPED UP TO I2 INCHES ABOVE THE TOP OF THE PIPE. CLASS 08" BEDDING FOR RCP U61e o o p v 0 ." • o. i•; e p D/4 (4" MIN.) UNDISTURBED SOIL COMPACTED GRANULAR MATERIAL MODIFIED CLASS "B" BEDDING FOR ESVCP AND CP "_W'ymlj� NOTES- 0••••••iiii�i�i�i0�ii�i�.'0•'i0�i�i�i�i1. PIPE SHOULD BE LAID ON COM- �ii�iO�i�i�i�i�i�i�i• •i�i�i0�i•.4i�ii�iPACTED GRANULAR MATERIAL W"Q 0•••OOi�i'00••DOAl' �.2. BELL HOLES SMALL BE HAND i�i0'00.•. SHAPED SUCH 'THAT THE BARINEIM OF THE PIPE LIES ON HAND BEDDING. . SACKFILL UP TO 12 INC04ES ABOVE THF TOP OF THE PIPE. PLACED SHALL BE HAND TAMPEDB. BACKFILL e•e • • e o D/P a T • • • ••. • • e e • 0/4 (4" MIN.) UNDISTURBED BOIL NNCOMPACTED GRANULAR MATERIAL CLASS ' B ` BEDDING FOR PLASTIC PIPE (PVC AND ABS. SDR 35 OR LESS) NN 1. PIPE SHOULD BE LAID ON COM- PACTED GRANULAR MATERIAL WHIC;.i IS TO BE PLACED OVER UNDIS- ....:♦:..♦.......♦.•....:..4...♦....:...� TURBED SOIL. 2. BELL HOLES SMALL BE HAND SUCH THAT THE BARREL . .. HAND BEDDING.PLACEDBACKFILL 5. BACKFILL SHALL BE TO 12 INCHES HAND TAMPEDUP ABOVE THETOP OF THE PIPE. U61e o o p v 0 ." • o. i•; e p D/4 (4" MIN.) UNDISTURBED SOIL COMPACTED GRANULAR MATERIAL MODIFIED CLASS "B" BEDDING FOR ESVCP AND CP "_W'ymlj� NOTES- 0••••••iiii�i�i�i0�ii�i�.'0•'i0�i�i�i�i1. PIPE SHOULD BE LAID ON COM- �ii�iO�i�i�i�i�i�i�i• •i�i�i0�i•.4i�ii�iPACTED GRANULAR MATERIAL W"Q 0•••OOi�i'00••DOAl' �.2. BELL HOLES SMALL BE HAND i�i0'00.•. SHAPED SUCH 'THAT THE BARINEIM OF THE PIPE LIES ON HAND BEDDING. . SACKFILL UP TO 12 INC04ES ABOVE THF TOP OF THE PIPE. PLACED SHALL BE HAND TAMPEDB. BACKFILL e•e • • e o D/P a T • • • ••. • • e e • 0/4 (4" MIN.) UNDISTURBED BOIL NNCOMPACTED GRANULAR MATERIAL CLASS ' B ` BEDDING FOR PLASTIC PIPE (PVC AND ABS. SDR 35 OR LESS) I I I I I I I I I 1 1 Appendix ' G' NEENAH R-1960 E OR APPROVCD EQUAL STEP DETAIL REVISIONS TO DESIGN STANDARDS FOR PUBLIC WORKS IMPROVEMENTS IOWA CITY, IOWA ' SECTION 3U - STORM SEWERS APPENDIX 'G' BRICK OR CONCRETE AS REQUIRED TO ' MAX. OF 4" TO MEET STREET GRADE MANHOLE FRAME AND LID TO LINE. 24" MAX. HEIGHT OF SPACER BE NEENAH R-1670 OR AP- RINGS, INCLUDING C.I. MANHOLE FRAME. PROVED EQUAL. ' GROUT FRAME 'o.'.•'p TO< :.e'. 1' -II° MIN. ..;'a'.;' SPACER RING OR ::o'' p'_p" .-o.',e••'.e'..'° r�FLAT TOP MANHOLE WALL 'o I% ' •'o' CEMENT MORTAR JOINTS WITH "� RUBBER GASKET AS SHOWN OR,•°. �o. •u•P COLD BITUMINOUS COMPOUND ' c JOINTS MADE IN SAME MAN- '.e NER AS SEWER PIPE JOINTS .' STEP WITH 6" STRIP MASTIC PAINT 'o • ' STEPS ARE NOT RE NO OUTSIDE OF JOINT. .••c. OUIRED IN STORM - •O SEWER MANHOLE .fid °' 48" PRECAST CON- LESS THAN 3 FT. 12�� MIN. • CRETE SECTIONS ' DEEP. .:'e' 'e.'. 16° MAX. 'O' CONFORMING TO ' A.S.T. M. SPECIFI- :e CATION C-73 e• e L ° 4' DIA. FOR 24" PIPE B UNDER o. 5' DIA. FOR OVER 24" PIPE - a' D I' ': u 0 L o' G s� o ° � n • e O TYPICAL MANHOLE 6OR LESS IN DEPTH NEENAH R-1960 E OR APPROVCD EQUAL STEP DETAIL GROUT FRAME TO SPACER RING OR MANHOLE WALL e STEP a 0 MANHOLE FRAME AND LID TO BE NEENAH R-1670 OR APPROVED EQUAL -II° MIN. ••o':. BRICK OR CONCRETE AS RE- QUIRED TO MAX. OF 4e TO 2 -0° MEET STREET GRADE LINE. 24° • MAX. HEIGHT OF SPACER .'e RINGS, INCLUDING C_ I. MAN- °•' • HOLE FRAME. CEMENT MORTAR JOINTS WITH Id -1= RUBBER GASKET AS SHOWN OR COLD BITUMINOUS COMPOUND JOINTS MADE IN SAME MANNER AS SEWER PIPE JOINTS WITH 6° STRIP MASTIC PAINT AROUND OUTSIDE OF JOINT. a 12" MIN. 16" MAX. ?• 4' DIA. FOR 24° PIPE d UNDER •e. 5' DIA. FOR OVER 24" PIPE 46" PRECAST CON- CRETE SECTIONS CONFORMING TO A.S.T.M. SPECIFI- CATION C-75 ° 10 di TYPICAL MANHOLE b' OR MORE IN DEPTH NE"" ` • 'e' I In ra R-110001 OR APMROVED y EQUAL e M STEP DETAfL I J 1] 1 I II Revisions to Design Standards for Public Works Improvements Iowa City, Iowa Section VII - Storm Sewers Appendix 'll' Mean Non-Erodi Material of Channel Bed Fine sand or silt, non - colloidal Coarse sand, sandy loam, non -colloidal Silty loam or sand loam non -colloidal Clayey loam or sandy clay non -colloidal Fine gravel Colloidal clay or non - colloidal gravelly loam Colloidal, well graded gravel Pebbles, broken stone, shale or hardpan Sodded gutters and 4:1 side slopes Ungrouted cobbles or bituminous paving Stone masonry or E abions Solid rock or concrete ng Velocities Velocity in Feet Per Second New Shallow Deep Construction Dit ch Canal - 0 .5 anal 0.5 0.5- 1.5 1.5-2.5 0.5-1.0 1.0- 1.5 1.8-2.5 0.5-1.0 1.0-1.8 2.0-3.0 1.0-1.5 1.5-2.0 2.3-3.5 1.0-2.0 2.0-2.5 2.5-5.0 1.0-2.0 2.0-3.0 3.0-5.0 1.5-2.0 2.3-3.5 4.0-6.0 1.5-2.5 2.5-4.0 5.0-6.5 1 .5-3.0 3.0-S .0 5.0-6.5 2.5-5.0 5.0-7 .5 6.0-9.0 5.0-7.0 7.5-1S .0 15.0-20.0 15.0-20.0 15.0-2 5.0 20.0-25.0 Measures to Control Velocity of Mean Channel Plow 1. Check dam or ditch check in channel. This may be temporary in order to allow channel aging to occur or to establish soil stabilizing growth. 2. Energy dissipators installed in critical reaches of the stream 3. Crossover driveway with culvert. Measures to Stabilize Channel Side Slopes to Control Erosion 1. Revetment paving with gabions or grouted cobbles. 2. Bituminous or concrete pavement. 3. Soil cement, lime or bituminous stabilization of adaptable material. 4. Stabilize soil with vegetation that will not obstruct flow. 1 ' ORDINANCE' N0, '16=J.H07 AN ORDINANCE REGULATING THE RAT': OF DISCHARGE OF STORM WATER RUNOFF: ' SPECIFYING CRITERIA FOR DETERMINING RUNOFF RATES: ESTABLISHING DEVELOP- MENT STANDARDS FOR THE CONSTRUCTION OF RUNOFF CONTROL FACILITIES: AND SETTING FORTH PROCEDURES FOR THE ADMINISTRATION THEREOF. ' SECTION I. PURPOSE. It is the purpose of this ordinance to establish maximum rates for the discharge of storm waters into the various watercourses of tht City for the purpose of promoting the health, safety and general welfare of the pop-ilation by minimizing or eliminating dangers of flooding to life and property. ' It is further the intent of this ordinance that runoff control devices be provided as areas of land are developed or redeveloped for urban use. It is not the intent -of this ordinance to utilize areas for the sole purpose of storing or detaining excess storm water, but to permit such areas to be used for other , compatible urban uses as well. �J l SECTION IT. DEFINITIONS. A. Storm Water Runoff. Water that results from precipitation which is not absorbed by soil or plant material. D. Natural Drainage, Water which flows by gravity in channels formed by the surface topography of the earth prior to changes made by the efforts of man. C. Excess Storm Water. That portion of storm water runoff which exceeds the transportation capacity of storm sewers or natural drainage channels serving a specific watershed. D. Excess Storm Water Passage_ A channel formed in the ground surface to carry ntorm water runoff through a specific area. E. Storm Water Runoff Release Rate. The rate at which storm water runoff is released from dominant to servient land. F. Storm Water Storage Area. An area designated to temporarily accumulate excess storm water. C. Tributary Watershed. The entire catchment area that contributes storm water runoff to a given point. H. Dry Bottom Storm Water Storage Area. A facility that is designed to be normally dry and which accumulates excess storm water only during periods when the restricted storm water runoff release rate is less than the storm water inflow rate. 1. Wet Bottom Storm Water storage Arca. A facility that contains s body of water and which ncrumulates excess storm water during perinda when the restricted storm wat,!r runnff rr•leane rate is less then the storm wator inflow rate. J. Cuntrol Structure, A facility constructed to regulate the volwae If utorn water runoff that it, conveyed during a specafrr length of time. ' Ordinance No. 7b-21.$07 page 2 ' K. Positive Gravity Outlet. A term used to describo the drainage of an area in a manner thal: will ensure complete removal of all surface water loy means ' of natural gravity. L. Safe Stocm Water Drainage. Capacity. The quantity of storm wat cr runoff ' that can be transported within a channel, passage, conduit, tube, duct, or com- bination thereof in such a manner that the elevation of the water does not rise sufficiently above the level of the adjacent ground surface so as to cause damage to structures or facilities located thereon. M. Low Flow. The transport or flow of a normal or usual volume of storm water as opposed to a high or peak volume which would utilize overflow facilities. ' N. City. The City of Iowa City, Johnson County, State of Iowa. 1 O. Director of Public Works. The Director of Public Works or his/her designate. ' SECTION III. REGULATIONS. The Department of Public Works of the City of Iowa City, Iowa, shall develop and establish written policies, procedures, criteria and regulations concerning the inspection, determination and approval of the standards for the construction and/or development of storm water ma nage- ' ment structures. Such rules and regulations shall be adopted by resolution by the City Council. SECTION IV. ADMINISTRATION. ' A. Prior to the construction of any storm water control structure or storm water detention facility on the construction or development site, the deve Loper shall obtain a building permit. No such permit shall be issued until the following documents have been submitted to the Director of Public Works and approved ' 1. Plans and proposed methods for the prevention and control of soil erosion. 2. Plans, specifications and all calculations for the control of storm water runoff as required by this ordinance and any rules and regula- tions promulgated by the Director. B. No building permits for habitable structures shall be issued for any ' development or redevelopment not complying with this ordinance. C. Any decision of the Director shall be pursuant to written specifi ea - tions and regulations as adopted by the City Council. SECTION V. ADMINISTRATIVE REVIEW. Any person affected by any decision of the Director which has been given in connection with the enforcement of any ' provision of this ordinance may request, and shall be granted, a hearing on the matter before the housing Appeals Board, provided that such person shall fi lc in E the offices Of the Director a writtvri petitiofn reou,•:aing aurh iwaring and se•eli.nq ' forth a brief statement of the grounds therefore. Upon receipt of such petition, the Director shall no a time and plane for ouch hearing and shell give the• petitioner written notice Cher, -,f. At such hearing, the periti.nner ahell 6. given j un opportunity to he hoard and to show why such derision should be modifiid or ' IG- 2.807 Page 3 ' withdrawn. The hearing shall be commenced not later than thirty (30) days after the date on which the petition was filed - After such hearing, the Housing Appeals Board shall sustain, modify or with - .at the decision of the Director, depending upon its findings. The proceedwith t such hearing, including the findings, ings and decision of the Housing Appeals ' Board, shall be summarized, reduced in writing and entered as a matter of public record in the office of the Director. Such record shall also include a copy of every notice or order issued in connection with the matter. No hearing shall be ' valid unless a majority of the Board is present and no decision at a hearing shall be valid and binding unless reached by a majority of the whole Board. Following the decision of the Housing Appeals Board, all parties shall be notified o f the decision by delivery to them of a copy of such decision by personal service ' or by certified mail, return receipt requested. Any person aggrieved by the deci- sion of the Housing Appeals Board may seek relief therefrom in any court of competent jurisdiction, as provided in the laws of this State. An appeal pursuant ' to this section shall not stay the effect of the Director's order unless so ordered by the Housing Appeals Board. ' SECTION VI. APPLICATION. This ordinance shall apply to any residential development comprising a gross aggregate area of two (2) acres or more or to any commercial, industrial, institutional, governmental, utility or other development or- redevelopment comprising a gross aggregate area of one (1) acre or more. The ' gross aggregate shall include streets and other dedicated lands. SECTION VII. EMERGENCY. Notwithstanding any other provisions of this ordinance, whenever in the judgment of the Director of Public Works a condition occurs in a storm water storage area that creates a dangerous and imminent health and safety hazard, the Director shall order such action as shall be effective immediately or in the time and manner prescribed in the order itself. SECTION VIII. GENERAL RE UIREMENTB A. Storm Water Release Rate. The controlled release rate of storm water runlloff shanot exceed the existing safe storm water drainage capacity of the downstream system as determined by the Director. The release rate shall be the average value computed with excess storm water representing 501, of the available stowage volume. Such release rate shall be computed as a direct ratio of the area of the tributary watershed and shall not exceed 0. 15 cubic feet per second per acre drained. Where a proposed development contains only a portion of a watershed or portions of several watersheds, the release rate and storage requirements shall be basod up3n the proportion of the area being developed as compared to the entire wat¢rslw_4 tribu'_ay tc the proposed t.torage area. Where it can be demonutrated by the Developer that a higher storm water rele>ane rnte will not be roar rary to the purpose dnd iut.rnt of this ordinance and where such propound releane rats will not. nd vnrnely affect propurtiei+ in the down- stre-amrirrrrion of the w,,rord,ed, the I,nrector nwy la•rnil t bush releasr rate to ba used as deemed appropriate. ' Ordinance No. 76-2N07 Paqu 4 ' B. L•'x cM;s Storm Water Passage. 1. An excess storm water passage shall ba provided for all storm water storage areas. Such passage shall have capacity to convey through the proposed development the excess storm water from the tributary water- shed. The capdcity of such excess storm water passage shall be constructed in such a manner as to transport the peak rate of runoff from a 100 year return frequency storm assuming all storm sewers are inoperative, all upstream areas are fully developed in accordance with the City's current land use ' plan, and that antecedent rainfall has saturated the tributary watershed. 2. No buildings or structures shall be constructed within such passage, however, streets, parking lots, playgrounds, park areas, pedestrian walkways , utility easements and other open space uses shall be considered compatible uses. In the event such passageway is reshaped or its capacity to ' transport excess storm water otherwise restricted, the Director shall notify the agency, party or parties causing said rostriction to remove the same, and set a reasonable time for its removal. If said presons refuse to or are ' unable to comply with said order, the Director siaall cause said restrictions removed at the expense of said persons. 3. Where a proposed development contains existing natural drainage, ' appropriate land planning shall be undertaken to preserve said natural drainage as part of .the excess storm water passage. ' C. Dote rmi. nation of Storage Capacity. The volume of required storm water storage shall be calculated on the basis of the runoff from a 100 year return frequency storm. Such calculation shall be made in accordance with the hydro - graph method of analysis as discussed in "A Computeri zcd Method for the Hydrologic Design of Culverts," I.H.R.B.P. HR -164 published by the Engineering Research Institute, Iowa StaLe University, Ames, Iowa. Rossmil ler and Dougal, February, 1974, or other method approved by the Director. The applicable storm water ' .runoff release rate shall be considered when calculating the required storm water storage capacity. ' D. Compensating Storage. In the event the ordc zly and reasonable develop- ment of an area requires the storage of excess storm water to be located elsewhere, compensating storage (the storage of an equal volume o f excess storm water) may ' be provided at an alternative location provided, however, that the feasibility and details of storm water control shall be approved by the Director. ' E. Easements. Easements which cover excess storm water passages, storm water storage areas and otht•r control structures shall be granted to the City for the purpose of repair, alteration or to insure their.proper operation, however, the City shall reserve the right not to accept such easement or any portion thereof. SECTION rX. DRY BOTTOM STORM WATER STORAGE AREAS. iA. Design Criteria. ' I. Lnin f1_and Secondary Uses. Dry bottom wtorm water storage areas shall be diestgned to nerve a secondary purpose for recreation, open space, parking lo -t, or eimilar type of uta rhot will not t>k, adversely affected by a■ occaeionbi intermittent flooding. Ordinance No. 76-2807 11 Page 5 ' 2. Drain S ::tem. A sy::tcm of drains shall be provided to transport low flow storm water runoff thruuryh ntorage arcas. Such drainage systems ' shall have a positive gravity outlet to a natural passage or storm drain wiLh adequate capacity as described in Section Viii, subsection B. ' M ultiplc outlets from a storm water storage area are to be avoided if the outlets are designed to be less than four (4) inches in diameter. 3. Storage Duration. The combination of storage of excess storm water ' runoff from a 100 year return frequency storm and the allowable release rate shall not result in a storage duration in excess of forty-eight (48) hours. ' 4. Grades. Where turf areas are used for the bottom of dry bottom storage areas, the minimum grades for such areas shall be two (2) percent (SC units horizontal to 1 unit vertical). Maximum side slopes for turf shall be twenty-five (25) percent (4 units horizontal to 1 unit vertical). Storage area side slopes shall follow the natural land contours in order to ' minimize the amount of earth work necessary to create the storage facility. 5. Erosion Control. Erosion control measures consisting of mulch, hydro -seeding, nurse crops, sod installation or other approved means shall ' be utilized to control soil movement within and around the storage basin. Energy dissipating devices or stilling basins shall be provided to ' ensure that downstream soil erosion is alleviated and the regime of the down- stream drainage facility is not disturbed. 6. Control Structures. Control structures shall be designed as simple as possible and shall not require manual adjustments for normal operation. Control structures shall be designed to maintain a relatively uniform flow independent of storm water storage volume. Inlet structures shall be ' constructed :Ln such a manner to prevent high velocity flow; to provide for the interception of trash and debris and for soil erosion control. Inlets shall be designed to eliminate turbulent flow conditions duffing any portion of the storm water storage cycle. Overflows for each storm water storage area shall be provided in ' the event a stone in excess of the design capacity occurs. Such overflows shall be constructed to function without specific attention and shall become part of the excess storm water passage. SECTION X. WET BOTTOM STORM WATER STORAGE AREAS. A. Design Criteria. Wet bottom storm water storage areas shall be designed in accordance with the design criteria governing the construction of dry bottom storm water storage areas, except for drains as required by Section IX.A.2. 1I II The following additional regulations shall apply- 1. pplyc 1. ConStructlon. The wateu surface area shall riot: exceed 1/10 of the taibutary watershed. Minimum normal water depth shall be four (4) feet. If fish are to be used to keep the pund clean, at leach 1/4 of the pund area shall have s minimum dopth of ten (10) feet. Page 6 ' Facilities shall be provided to lower the pond elevation by gravity flow for cleaning purposes and land/water interface maintenance. Protection of the land/water interface shall be provided to alleviate soil ' erosion due to wave action. 2. Control Structures. Control structures for storm water release shall operate at their maximum rate with only minor increases in the water ' surface level. 3. Stagnation Control. Measures shall be included in the design to prevent pond stagnation. Such measures may include fountain aeration or other approved means to ensure aerobic pond conditions_ ' 4• Determination of Storage Capacity. When calculating the storage capacity of wet bottom storage areas, only the volume available to store excess storm water shall be considered. Permanent water storage does not constitute control of excess storm water runoff. SECTION XI. MISCELLANEOUS STORM WATER STORAGE AREAS. ' A. Paved Surfaces. paved surfaces, including automobile parking lots in proposed storm water storage areas shall have minimum grades of one (1) percent (100 units horizontal to one (1) unit vertical) and shall be limited to storage ' depths of one and one-half (1-1/2) feet maximum. Pavement base design ani! construc- tion shall be accomplished in such a manner as to prevent damage from flooding. control structures in paved areas shall be accessible for maintenance and clean- ing. The use of vortex control facilities at inlets to ensure that the maximum allowable release rates are being developed shall be required as necessary. Where parking areas are used to store storm water, the areas of greatest ' depth shall be restricted to the more remote, least used areas of the parking facility. ' B. ROOftop Surfaces. Rooftop storage of excess storm water shall be designed with permanent -type control inlets and parapet walls to contain gxcess storm water. Adequate structural roof design shall be provided to ensure that roof deflection ' does not occur which could cause roof failure. Overflow areas shall be provided to ensure that the weight of stored storm water will never exceed the structural capacity of the roof. ' C. Underground Storage. Underground storm water storage facilities shall be designed for easy access to accommodate the removal of accumnulated sediment. Such facilities shall be provided with positive gravity outlets. ' SECTION XII. CONTROL IN EXCESS OF REQUIREMENTS Provision of Control Exceeding Reoui ree�ee� In the twerrt stormy wv+ter runoff control can be p,uva.ded in excess of the requirements of this ordinance and the benefit of such additional control would accrue to the City of Iowa City ' at laroe, the City may provide public participation in the i.neressad cost r' the con�rol of storm water runoff in proportion to the additional benefits received. ' Ordinance No. 76-7.x07 Page 7 ' SP:CTION XIII. REPEALER. All ordinances or parts of ordinances in conflict with the provisions of this ordinance are hereby repealed. ' SECTION XIV. SEVERABILITY CLAUSE:- If any section, provision or part of the Ordinance shall be ajdudged to be invalid or unconstitutional, such adjudi- cation djudi- cation shall not affect the validity of the ordinance as a whole or any section, provision or part thereof not adjudged invalid or unconstitutional. SECTION XV. EFFECTIVE DATE. This Ordinance shall be in effect after its ' final passage, approval and publication as required by law. It was moved by deProsse and seconded by Perret ' that the Ordinance be finally adopted, and upon roll call there were: AYES: NAYS: ABSENT: 1 __ x Balmer x deProsse r. Foster ' r. Neuhauser x Perret x Selzer x Vevera t 3yor r AT1'E'ST: ' City Clerk ' First Consideration 8/24/76 Vote for passage: Neuhauser, Vevera, deProsse, Foster: Aye. Selzer, Balmer: Nay Perret: Absent. Second Consideration 8%31/76 ' Vote for passage: Foster, Neu auser, Perret, Vevera, deProsse: Aye Selzer, Balmer: Nay. None absent ' Date of Publication & ptow16er 30, 1974 Passed and approved this 7th day of September-, 1976. I! ' ORDINANCE N0, 76-2816 ' AN ORDINANCE AMENDING ORDINANCE NO. 76-2807 WHICH REGULATES THE RATE. OF DISCHARGE OF STORM 10MER RINOIT BY ENACTING A NEW EFFEC- TIVE DATE OF SAID ORDINANCE AND REPEALING SECTION XV OF 0101NAtM NO. 76-2007. =ION I. PURPOSE. The purpose of this ordinance is to amend Ordinance ' No. 76-2807 which regulates the rate of discharge of storm water runoff by enacting a new effective date for said regulations. ' SECTION II. AMENDMENT. Section XV shall now state as follows: ' This Ordinance shall becare effective on the 6th day of November, 1976. ' SECTION III. REPEALER. Section XV of Ordinance No. 76-2807 is hereby repealed and all ordinances or parts of ordinances in conflict with the provisions of this 1 ordinance are hereby repealed. ' SECTION IV. EPFFX•PIVE DATE. This Ordinance shall be in effect after its final passage, approval and publication as required by law. =t was moved by. Balmer and seconded by deProsse I I I that the Ordinance be finally adopted, and upon roll call there were: AYES: NAYS: AB.,I•NP: x Balmer x deProsse x Foster x Neuhauser x Perret x Selzer x Vevera � ATTEST: D 11A�7. .ADA Mayor City Clerkq It was moved by Balmer and seconded by deProsse that the rule First Consideration requiring the Ordinance to be considered and voted on for passage at two Council meetings prior to the meeting at Which it is to be finally passed lie suspends -d, the first ani Second Consideration second consideration and vote he waived, and that the Ordi— nanoe be voted upon for final passage at this time. Poll ca11: delirmse, Foster, Neuhau:ser, Perret, Selzer, Vevera, Balmer: Ayer Date of Publication -- Nays: none. hbtion adopted, 7/0. Passed and approved this 2nd day of t ovember 19 76 . 5X7�,t City of Iowa City MEMORANDUM DATE: April 22, 1977 TO: Neal Berlin and City Council FROM: Dick Plastino, Director of Public Works RE: Storm water specifications le As you recall the Storm hater Management Ordinance requires Council adoption of specifications on storm water design and erosion control. The booklet on storm water specifications is complete. The process for this document was as follows: 1. The City Engineering staff worked in close conjunction with Powers -Willis and Bill Lindley to prepare technical speci- fications necessary to make the Storm Water Management Ordinance work. 2. A rough draft of the document was sent to consulting engineers in town for an engineering review. It is important to note that we were not seeking nor did we accept suggestions compromising on any of the technical portions of the specifications. Our only intent in sending the document to the consulting engineers was to have them aid us in picking up errors in engineering formulas, technical specifications, etc. 3. The document was returned by the consulting engineers to the City engineering staff. Errors and omissions pointed out by the consulting engineers were incorporated into the documents and a reply was made to consulting engineers either in writing or verbally on suggestions that were not incorporated into the document. Some typical errors and omission and recommendations that were provided by the consulting engineers and our comments to L hem are listed below: 1. Consulting Engineer Comment: Allow more open ditches as a normal means of carrying flow through subdivisions. City Reply: Not accepted. Open channel flow except in a very few instances creates erosion problems, aesthetic problems, mosquito problems, etc. 2. Con4ulting Engineer Comment: The Ven Te Chow method of storm voter storage calculations is overly conservative. An alternate method was suggested, Neal Berlin and City Council Page 2 City Reply: A check of the Ven Te Chow method did reveal that the formula resulted in overly conservative results as more and more of the area under consideration became paved. City Engineering staff provided a cut off of a maximum five inches of storage. 3. Consulting Engineer Comment: The wording in the specifications does not make the design of the overflow spillway clear. City Reply: Specifications rewritten to clarify section referring to overflow spillways. 4. Consulting Engineer Comment: Specifications do not discuss increased discharge rate under some circumstances. City Reply: The ordinance does specify this and since this is a rare exception it was not and will not be included in the specifications. 5. Consulting Engineer Comment: In a five year storm the specifications require a 12 foot lane be left free of water on local and collector streets. A suggestion was made to reduce this to nine feet. City Reply: A 12 foot wide lane is the minimum necessary to provide drivers with some feeling of security in driving down a flooded local or collector street. Due to other changes in methods of calculating storm flow, considerably fewer storm inlets will be placed under these guidelines than under previous guidelines. This change in technique and use of only a nine foot clear lane will result in too few storm inlets. The suggestion was not accepted. 6. Consul ting Engineer Comment: Allow use of corregated metal pipe with coatings. City Reply: Not accepted. Corregated metal pipe, regardless of coating, finally does deteriorate after 20 to 30 years. This simply is not acceptable from a municipal maintenance standpoint. 7. Consulting Engineer Comment: The requirement for two feet of cover over storm sewer pipes under pavement may be difficult to meet. City Reply: The specifications were changed to minimum recommended cover shall be two feet. B. Consul ting Engineer Comment: An alternate method of hydraulic computation would result in less storage being required. The Ven Te Chow method is too conservative. City Reply: Rejected. The method proposed by the Consultant had no mathematical or empirical validity. The Ven Te Chow method has been proven in actual construction projects and represents a conservative, common sense approach consistent with public safety requirements. r Neal Berlin and City Council Page 3 9. Consulting Engineer Comment: Several suggestions were received for using slightly different runoff curve numbers. City Reply: Runoff curve numbers are a matter of engineering judgment. City staff believes the numbers in the booklet are reasonable and rational. When the Storm Water Management Ordinance was in its proposal stages, an implicit understanding was made with most land developers that the City staff would attempt to make trade offs to help partially compensate for any increased cost of implementing the Storm Water Management Ordinance. It must be remembered in many cases the Storm Water Management Ordinance will have the same as ox less cost than traditional methods, but there are cases in which the cost will be greater. The City Engineering staff believes some trade offs have been made that will aid the developers financially. These are listed below: 1. The Ven Te Chow method of calculating water flows is allowed rather than the Rational Method. This means that storm water inlets can be spaced further apart and can be made smaller. This saves the developer money. 2. On collector and local streets, grate type inlets are allowed in place of the curb inlets now required. This has the potential of saving developers from 1/3 to 1/2 the cost of curb type inlets. 3. Existing City standards require only reinforced concrete pipe for storm water pipe. The new specifications allow use of reinforced concrete pipe, clay pipe, or plastic pipe. This has the potential of significantly cutting the cost of acquiring and laying pipe. The Storm Water Specifications Document was not submitted to land developers for review since it is essentially a very detailed technical document. All of the engineering firms that reviewed the document are active in land development work for major developers in the community and it is believed that their statements closely mirror the concerns of developers. In my professional opinion the attached booklet is a superior set of specifications which should serve both land developers and the public well. It is sound from an engineering standpoint, sound from a development standpoint and the document is workable. We have had experience over the lest four months with actual subdivision design and the specifications do answer the majority of the problems encountered. The attached document is specification booklet no. 1 of the two booklets required to fully implement the Storm Water Management Ordinance. Booklet no. 1, "Specifications for Soil and Erosion Control" is expected to be presented to Council in approximately four weeks. With adoption by Council these two booklets will signify full implementation of the Storm hater Management Ordinance. cc: Lund developers 41 City of Iowa COY DATE: April 18, 1977 TO: Neal Berlin and City Council FROM: Dick Plastino, Director of Public Works RE: Handicapped Barrier Removal Projects Attached is a report on handicapped barrier removal projects. Please note that the drawings in the report are hand sketches. I specifically instructed the Consultant not to redraft the drawings since it would only up the cost of the report with no increase in usefulness. The report basically has the following information: 1. A chair lift at the Civic Center is not suitable because of reduction of stairway width and danger of the mechanism to the general public. An elevator can be installed which will provide accessibility to the top floor and the basement of the Civic Center. Cost $78,500. 2. A chair lift 'is not advisable at the Iowa City Public Library for the same reasons as stated above. The Consultant recommends no project be done at the Library considering the likelihood of a new building in a few years. Costs 0. 3. Installation of an elevator in the Recreation Center. This appears to be a very feasible project. Cost $65,200. 4. Drop off at the north side of the Rec Center. This project is feasible. Cost $3900 (will be done by the Park Department with City work crews). S. Ramp on the west side of the Rec Center. to provide front door accessibil4ty. Cost $7550 (will be done by the Park Department). 6. The proposal for handicapped locker rooms at the Recreation Center is feasible. Cost $7,040. (This project should only be done if the elevator at the Recreation Center is done.) 7. Swimming pool accessibility appears viable. Cost $8000. Total cost of all projects plus approximately $20,000 for engineering is $ 190,170. The Consultant has been instructed to begin design work on projects 3, 4, S , and 6. Neal Berlin and Ci�Council Page 2 46 A decision is needed from the Council on the following subjects: a. Should an elevator be installed in the Civic Center? All the other options are half way solutions and if anything is done an elevator is recommended. b. Should an elevator be installed at the Library or should it be assumed that a new building will be built in the next few years? c. Should the Consultant be instructed to begin design work on the swimming pool accessibility? The only reason the Consultant was not started earlier on this project is that it was added after the cont=act was signed. A slight contract modification will be needed in tine amount of design fee money. cc: Julie Vann Dennis Showalter The Library Board Don Schaefer, JCRPC Handicapped Barrier Removal Projects I.1 1 City of Iowa City Iowa City, Iowa April 12,1977 Alm Hansen Lind Meyer, Inc. Arclutectwe Engmeenng Planning mean, Design Environmental Graphs Landscape ArChlteCtwe Energy Management iydd;..; M-- I FINAL REPORT HANDICAPPED BARRIER REMOVAL PROJECTS 12 APRIL 1977 CITY OF IOWA CITY CIVIC CENTER IOWA CITY, IOWA PROJECT SCOPE: Entails the analysis and investigation for the removal of certain architectural barriers at the Civic Center, Iowa City Public Library, and Recreation Center to improve the accessibility and thus the usability for handicapped and/or elderly persons. Project No. 1: Analyze and investigate the installation of an Inclined chair lift from Level One, the entrance level, to Level Two, the upper level, at the Civic Center. Project No. 2: Analyze and investigate the installation of a wheel- chair lift traveling from the main entrance level to the Information and reference level at the Iowa City Public Library. Project No. 3: Analyze and Investigate the installation of an eleva- tor from the lower level to the main level of the Recreation Center. Project No. 4: Investigate the location for a handicapped/elderly drop-off area for the Recreation Center on College Street. Project No. 5: Investigate accessibility to the front entrance of the Recreation Center. Project No. G: Analyze and investigate the Installation of an accessible shower area and restroom facilities In the men's and women's locker rooms of the Recrea- tion Center. PTojrcS Tlc. 7; the r��!.,Jerns Invn1vnd In makina the swimming pool at the Recreatinn Center accesslble for recreation purposes. I ' PROJECT NO. ONE, CIVIC CENTER ' Investigation at the Civic Center indicated that the stair from Level One, the entrance level, to Level Two, the upper level, is 6'-0" wide with an approximate change in elevation of 3'-4". There is approximate clearance ' In front of the lowest riser of 19'. 'The adjoining wall at the north is plaster on 12" concrete block. There is a handrail on the south side of the stair. The incorporation of an inclined wheelchair lift of the platform type appears We also have been In touch with the local representative of one of the com- panies. He Indicated that whenever they sell one of these wheelchair lifts, they require the purchaser to purchase Insurnnce in the name of the elevntor company and tin not feel thh, oppnrotus is npproprinte for use tly the general public. II to be physically impossible. A lift is manufactured that may be mounted to one side with the platform cantilevered from a rail which is anchored into ' the wall. The platform dimension is approximately IIO" long x 30" wide and Is out from the wall approximately lo" . Therefore, the stair which is V-0" wide would yield a remaining 32". With 'the handrail, this would further ' be reduced to approximately 26". Capacity of the single track lift is in the neighborhood of 350 pounds. As an electric wheelchair weighs 125 pounds, the maximum weight of a person using the lift will be 225 pounds. It has t been indicated that few handicapped persons weigh this much. However, there are exceptions and it would seem that this is a questionable condition. The lift has a speed of 25 feet per minute. The drive unit is mounted ' adjacent to the lift and moves up and down the rail, rather than a chain or other drive mechanism located at the head or foot of the stair which we feet to be more dangerous. The capacity of the lift can be increased ' with an additional rail down the center of the stair. However, it was fell this was an unacceptable solution since it would make the stair very dangerous to normal foot traffic. It is also possible to recess the lift t platform into the floor so the top of the lift Is flush with the floor sur- face. This would eliminate the necessity of lifting the platform out of ' the way when not in use. Vle have verified the applicable codes .A,Ith the Department of Labor, Eleva- tor Division, and have 'found there apparently are no national or state codes nor any pending legislation that would govern the installation, operation or manufacture of such a lift. We have been in touch with Mr. Welter Johnson, ' Acting Commissioner of Labor; tAr. Tom Trammel with the Department of 'Labor; and Gtr. Daryl Wynn with the Cepartment of Public Safety under Mr. Don Appell. We also have been in touch with several manufacturers of these lifts. All sources indicate that no limiting code restrictions have ' been enacted with the exception that the chair -mounted -to -the -rail type Is In violation of the code according to Mr. Johnson. We also have been In touch with the local representative of one of the com- panies. He Indicated that whenever they sell one of these wheelchair lifts, they require the purchaser to purchase Insurnnce in the name of the elevntor company and tin not feel thh, oppnrotus is npproprinte for use tly the general public. II Recommendation: We do not recommend the installation of a wheelchair lift due to potential liability for the City and danger to persons using the lift and stair. We do recommend consideration of the following alternatives as a means of solving the accessibility problem. Alternatives: 1. The first alternative is to install an elevator in the Civic Center which could provide access from the entrance level to the upper level and from the entrance level to the lower level. Our initial thought is that this elevator would be located within the area presently occupied by the records vault and would be double -ended. This would require less than one-half of the vault area. The west end would access the entrance level through a new elevator lobby at the foot of the stair and inside the vault area. The east door would open out onto the lower level and upper level into areas where there presently are offices and, in turn, access the present corridors. This would be the most expensive solution to the problem, but it would make the building fully accessible. The preliminary estimated cost of this proposal without a detailed investigation is $62,500 to $78,500. 2. The second alternative would anticipate a long ramp from the entrance level to the upper level. The ramp would start where the present stairs on the upper level start and would traverse the entire length of the entrance level winding behind the present emergency counter and probably causing a need for the relocation of offices at the west end of the entrance level. This entrance ramp would provide access to the upper level only and would greatly extend the normal travel path for those who are not handicapped. The preliminary estimated cost of this solution is In the $20,000 to $30,000 range. 3. The third alternative would anticipate putting an exterior ramp north and west of the present records vault which would pro- vide access from the entrance level to the upper Ievcl. A second rarnp could similarly be Installed from the entrance level to the lower level. These entrance ranips could be provided with electric snow melting or they could be enclosed. The preliminary estimated cost of tills proposal is $16,000 to $22,000 for the up- rarnp -Pius 525,-000 for thQ^wn-ramp. Snow meiting and enclosure, are riot Included. 11 PROJECT NO. TWO, IOWA CITY PUBLIC LIBRARY ' At the main library, a person in a wheelchair cannot reach the information/ reference area and checkout desk from the main entrance or other floor levels. Thus, the facility is unusable to a person using a wheelchair with- out aid from another person. The stair width Is V-0" . The change in elevation is approximately il'-10", ' and the runout available is about 11'-01'. The adjoining wall to the south is face brick with 11" concrete block backup. The same analysis of the lift at the Civic Center applies to this project; i.e., the physical possibility of the lift installation, appropriate use by the general public and potential liability. Recommendation: we would not recommend installation of a wheelchair lift at the Public Library. There are other alternatives such as installing an ' elevator on the north wall at the point where the original library and the addition join. This elevator would have to be installed in totally new construction and we do not feel this would be a cost effective move consider- ing the potential for a new library in Iowa City within the next five years. It might also be possible to provide an exterior ramp directly accessing the upper level. Here again, we do not feel this expenditure would be cost ' effective at this time. f1 I I 1 1 1 E' I' E 1 1 Scheme No. Two has the advantage of being well located functionally, but the removal or alteration of the structural system may have very serious consequences. Cutting the pretension steel in the precast dock could be a serious matter, and shortening the member might interrupt continuity. Either of these conditions could cause a structural failure. At the ground floor, the structural slab would require alteration also; however, pile caps In that area are less critical. Scheme No. One would appear to be most appropriate at this time as the allowable space at the stair and the space adjoining at both ground floor and first floor would allow an appropriate elevator to be installed with a single -sized entrance toward the north. This has the negative feature of lack of visual control from the general office area, but with the develop- ment of a small elevator lobby In the present shop area and the use of mirrors, visual control would be possible for both the lobby and the elevator. The structural slab at ground floor will require modification, and it is believed the pile caps are at such a depth to permit elevator pit installation. Apparently, an absolute minimum pit depth of 3'-9" Is required. The drawings indicatr that the tops of the pit(- caps are helow the ground floor slab by 3'-10;". For budget pricing, we would propose that a 2,100 pound capacity elevator in a 6'-811 x W-6" shaftway be Installed tit the stair location. P.n initis! k:tter outlinin canncities hr's been InduelPd for this elevator. A sketch Fins also been prepnred Indicating the shaftway, plat- form size, and appropriate elevator equipment area. The estimated cost of this scheme Is $57,000 to !65,200. Funeonunendatl(it : Scheme One solves the problmm: and is rccunuoenJed. PROJECT NO. THREE, RECREATION CENTER ELEVATOR ' We have investigated the different possible locations for the installation of an elevator, traveling from ground floor to first floor, an approximate dis- tance of 10'-0". On-site investigation and discussion with both Nr. Dennis ' Showalter, Director of Parks and Recreation, and Mr. Robert Lee, Superin- tendent of Recreation, indicated that several locations had been previously discussed; one, at the stairwell opening; two, to the north of the swimming pool wall in the southwest corner of the game room and southwest corner of the social hall; and three, at the east exterior of the building outside of the game room and social hall. The investigation yielded that the three ' schemes were all physically impossible. However, Scheme No. Three is not functionally appropriate as one must use a portion of the game room on the ground floor and must transverse the social Ball on the first floor to use any of the other areas. Also, the teen terrace deck is a structural slab which would have to be modified. It would be assumed that the pile caps are low enough to permit the installation of the elevator pit. ' Aesthetic considerations at the exterior on the east would at best be questionable. 1 1 1 E' I' E 1 1 Scheme No. Two has the advantage of being well located functionally, but the removal or alteration of the structural system may have very serious consequences. Cutting the pretension steel in the precast dock could be a serious matter, and shortening the member might interrupt continuity. Either of these conditions could cause a structural failure. At the ground floor, the structural slab would require alteration also; however, pile caps In that area are less critical. Scheme No. One would appear to be most appropriate at this time as the allowable space at the stair and the space adjoining at both ground floor and first floor would allow an appropriate elevator to be installed with a single -sized entrance toward the north. This has the negative feature of lack of visual control from the general office area, but with the develop- ment of a small elevator lobby In the present shop area and the use of mirrors, visual control would be possible for both the lobby and the elevator. The structural slab at ground floor will require modification, and it is believed the pile caps are at such a depth to permit elevator pit installation. Apparently, an absolute minimum pit depth of 3'-9" Is required. The drawings indicatr that the tops of the pit(- caps are helow the ground floor slab by 3'-10;". For budget pricing, we would propose that a 2,100 pound capacity elevator in a 6'-811 x W-6" shaftway be Installed tit the stair location. P.n initis! k:tter outlinin canncities hr's been InduelPd for this elevator. A sketch Fins also been prepnred Indicating the shaftway, plat- form size, and appropriate elevator equipment area. The estimated cost of this scheme Is $57,000 to !65,200. Funeonunendatl(it : Scheme One solves the problmm: and is rccunuoenJed. u m e. � I Lh4 I� T utA'b"� F vN ... .....- I u• t ¢•'4' I �Jo. B_o ,' .p'"- '4"_ tl{11I- -m• GLUE 7C G'• t.:a,.l.._ Ij _ :_� __- •J• _:.�1 =_ °`ly2 ILL I ilo r I f razf,-,fLr, A `'. 'Or 'l. L44HT COVE . ,na•• TNI)WAL6 i•.•. WALL, -Tx0V STUDS 16"a.a. \:?.S - -- - lu - -' •Ilof.--- r J'•r U JArw vL! STco• rn. t-- i I c • Ij JCel .Q LAVH j 11.45.CEIL-. �y I i (.Qi v>'r!S It soriacaASIXG .' S. T o R A G E, I -- - j'- =—_.=� :114 't128� Q I (L mtit`' .V i1�NY N • , Y ©1 S. Y SEE 2,fJ '2 4 IGO --- _- _._ DEF. ,I Ib'•O• T CO: L D o'W 1J m .. I :�+ 5 H O. F E553w"_I 1 --•- il' p; 6-8 �'•$• ,i �IK� I C E ? <. Eii � '<'<'-, 'p' I! DAL 4 Ic I m / ! Fuvl w'w B � �•, rcnK I, LAY Jr .- I 1 1 A LL a 1 5 X Fti / I I II �• i' 'N'f Ca01nT L•1► .j Y I 1 11 i','� • 1 .. el -dal I BI_OII' 1,,,, � . .1�.--, ego I J 71 X41 �.o R..R y. j Gi '"" '7r`° •0 110 113 a ,+'�Ti..N.. 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J ..Iq .OI I , I .-.__ "o•Y fe •�11 11 I f1.4' � 14011 I1:�. � Y i' .T „}- w.•�•�__:n..1 tf -i tia �_ 1 •, 1 -_ -- . •• r I 1 1 1 1 1 I' II u II I1 .r c elevator company I. MOLINE. ILLINOIS 61265 .. j Mr. Dick Kruse Hansen, Lind, Meyer, Inc. P.O. Box 310 Iowa City, Iowa 52240 Subject: Iowa City Recreation Center Proposed New Elevator Dear Dick: March 10, 1977 I enjoyed our conversation today about the proposed new hydraulic passenger elevator for the recreation center. As you know, I have been pursuing this project for almost two years. f understand that your design intent is to install a two landing elevator within the existing stairway area. Providing a two hour rated elevator hoistway in the available space would probably provide a clear inside hoistway dimension of 6'-8" wide by 6'-8" clear. Based on that dimension and the understanding which I have of Handicap Provisions and the Iowa State Elevator Code (as well as good hydraulic elevator application), I have prepared an architectural specification describing my recommended elevator design for this project. Enclosed find two copies of this specification. You will note that the platform size shown is 5'-4" wide by 5'-11" front to back. This would be the gross platform dimension which would equate to the previously mentioned hoistway dimensions. If, however, the actual clear inside hoistway dimensions are changed, the platform dimensions would no doubt have to be modified as well. In any event, based upon a platform 51-4" by 51-1111, note that I have shown the capacity at 7100 ills. This is the ABSOLUTE MINIMUM capacity which would be permissible for this elevator by Iowa State Elevator Code. Also note that I have shown a speed of 105 FPM Up and 125 FPM Down. Such a speed is based on the probable elevator travel (12'-0"), the estimated weight of the elevator and the capacity and provides the most effirienf use of pnwer unit/"rtnr horsepower. This elevator could be rated at a slower speed but absolutely no economics would result. Rating the elevator somewhat faster would not dromalieai ly increase the price but would be a noticeable price Increase. Based on an elevator estimated in accordance with the enclosed architectural specification, I would estimate (FOR BUDGET PURPOSES ONLY) the cost to furnish and install such a unit at npproximately $22,000. Oick, this budget price utilizes TOUAY's FIGURES. I f this project is deloved as it has been. Inflation should he (It ptvLiLIb14- rlr.v;It,"s and c;;rutln(urs I I 1 1 1-1 I C Mr. Dick Kruse March 10, 1977 Page 2 considered in utilizing this budget. Additionally, you and I discussed the possibility of installing a wheelchair lift in this structure. Even though the Iowa Bureau of Labor, Elevator safety Division has no jurisdict ion regarding this matter, I would recommend against such an installation. Montgomery feels that this type of equipment is not normally designed for the use of the GENERAL PUBLIC. This is not to say that available equipment is unsafe or unsatisfactory. However, factors of safety, etc., utilized in commercial passenger handling equipment are far more strenuous than those utilized in the design of RESIDE14CE UNITS. In geographical laeas where, by law, Montgomery would be permitted to price such equipment, very sitant to do same for installation in something other than a SINGLE FAMILY RESIDENCE. Where such a proposal is made for installation in areas where the equipment canhbe used by the GENERAL PUBLIC, we require that the customer provide Montgomery it an additionally insured insurance policy which protects Montgomery against any liability based on injury associated with the operation of such equipment. Also, we require that a very complete HOLD HARMLESS agreement be executed by the customer which eliminates any possible legal liability which we might otherwise assume for the installation of this equipment. There are obviously very good reasons why we approach these matters in such a fashion. Dick, I trust that the foregoing project develops, please keep me based on changes which may occur good to talk to you. /mc and enclosed will be helpful toyou. As this information posted and I will update any Dick. It was Thanks for contacting Montgomery, Yours very truly, MONTGOMERY LEVATOR COMPANY E. J. Kiely II Director of Sales T ralning Sales Engineer I PROJECT N0. FOUR, RECREATION CENTER DROP-OFF The investigation to provide an appropriate drop-off area for the elderly and handicapped would appear to be most efficiently accomplished by removal of two parking spaces on College Street, removal of thirty feet of curb, and ' appropriate reshaping of the adjoining sidewalk to accommodate persons in wheelchairs and traffic of the less agile. It is felt this would be much more economical, safer, and just as effective as the possibility of making curb cuts on Gilbert and College Streets to form a drop-off in the lawn area at the north- west corner. That scheme becomes even more hazardous with the traffic signal control box being located at that corner and with the complicated traffic pattern with the turn-off so close to the Gilbert Street corner. Please see the enclosed sketch. Estimated cost of this project is $3,375 to $3,9oo. Recommendation: This solution solves the problem and Is recommended. 1 I 1 I1 11 II PROJECT 1`410. FIVE, RECREATION CENTER -RAMP ENTRY The investigation to provide a front door entrance for the handicapped seems to be best accomplished by the use of a ramp. A 4'-0" wide ramp with a 1 to 12 slope (8.33 percent grade) could be easily constructed between the existing sidewalk and the existing masonry wall projection. The space between the ramp and the building can be filled with earth to minimize any change in elevation on that side. A handrail would have to be provided to the west. We would intend to provide a runout area at the bottom of the ramp which would be at equal elevation to the sidewalk, allowing a smooth tran- sition between the ramp and sidewalk area. A top landing can also be provided. An alternative solution to building the ramp might be to develop the north entrance cf the craft room with an electric buzzer lock system. This cou id be done with the addition of a wal I , or leaving it open as at present. The estimated cost of this project is $7,120 to $7,530. Recommendation: This solution solves the problem and is recommended. N ' Fn N O � i ,• � T _ W � E' a ' Tb RIJ, -_2222..—`.�/ .._ 1 ` itGS A f/ ✓ I� . j , jr 00 MAN NL M J (A.4-7MMJ OUT 64._6 I I I ,� � .�.CL4M1q ,o r -e1 e'4l �- I CUMVr WALL � 4(v SLL room rW SEL Fu DN pt." r.'�. *� I�•y.'. F.11 __ - I M._�t_dc5 19 I �. Kaci •," ./ ..- .. ,�,,; .. `''� '�2".�•S`,S", ' ` j - ---==--•+r--__---a�-�._ �._� ori .� - Wj , �jrJvin 5ewtx. �� 60r4c ' !,..� jLs•r�_ .i . _!�� , ! I i ,. � �,r>, .S .•. �,117.C,�BCf.C�' ..T.C�i'19=? • \__:.. �. ._. .� .. _222_2_... un.n c.. v' y' n _ •UTr_H 5Ac71l.t ' I 16'x' .� . _ Ep'•o' (r Cy I L b z R. T 5 it Y 5 1 T a N D ¢, o I ' PROJECT NO. SIX, RECREATION CENTER LOCKER ROOMS ' The investigation for including accessible shower and toilet facilities in the men's and v, -omen's locker rooms indicated that any work to the existing plumbing or shower areas would put the operation of the locker rooms out ' of use during construction. Our basic approach to the proposal is to leave existing facilities undisturbed ' and to install a handicapped toilet and shower for each sex in the storage space located between the men's and women's locker areas. We would propose that a handicapped lavatory be exchanged for one of the existing ' lavatories to provide that facility. This method also retains the separate entrances as exist off the west corridor. The estimated cost for this pro- ject is $6,050 to $7,040. ' Recommendation: This solution is recommended. 1 1 1 1 1 1 11 11 Ii 8 �• _ .... .. ... .. .. $.Y ----' . _ .. _.. 1 II ---� -- --� .. I- q / ' ! r 9 W 1 M j M I N 11 i PP -0P 4W, 5'1°� .. P 8pytr an ouS 1 W"" PLA c cmc:' f . S7 ER. i IIS1 I �JVj/1 �cl� �n vTl1 ';0&1, I �" -�- � ; ' � 9 I I 't ` I waR_ cvr wano..l °r I ii• Q) . i .WALL A,.Ru' D mY a', --I SLEC. PAN e 1 Li ` 21' I i •-x-`22'' .. .II . 'w i tD(Pl ,I 0�_j_�� _ _ _ : j1^ _, •,.,__. —__ ..�. _�--I, 3O -- 6�-0�_ loo _III_ L \ 1 — :' ` tOFFIGE c0� CERAMIC: TILc po i euae tJ t I I p I f•� , 31. zl {, / 1I r . r••1f J� , 4i;� �•••neupnLE uA.�VJI �� WTGNUJETTE / .• i `. 37•'—'—� �r ..._..I. s-rAI ILA–, z �J \\ !r � I ,I s uNe c°ny Au.vC °\V\�e7 I g. .I Rif lF'wDR n c Irlurn/ to yii[,ru:y lce STO h� cIA) lIu II 13'0• i3,Z 3'O~ 3•o•F9tg',�+�o~=r�ZI.Br+ �,I eArEAcrtAu•reh .' I V lI �9 i, (35�1H O1 �:_7. EOI +I —•Ia, -iry ._ '. i Ih�.. 14, 1z9� I ,j 'I 1 V`i`Iwt °I Rwrrl °PnD rQl , I }i 1•E] 1 6I=P� I� ! .•$ I c._. 9'r5 1.r r.; fE•p r -•cess ,w ww�r `1I� • `. 9r4• a ,�� 78 G•I �_-1i'8,- -�---11:8"�_ k; ! 2 �..� .._ L GB,. 4 i�•Ifl' 5•a P,F-cc• n.. r �r I 6NO WEIL DR�lIN6 �6Now Cd { =� CFS Q _ 1\M.t V SNOwCRri � / �"� I. t0 :a 1. s'Z , 3 4 � { �j�� :ti _RI' su •w�er l� 10 •t: .I r j 1A I 'll 1r v .rd�D ._ lam• / +• r- I uJ ' t•Dr _ r9 , "t O _ I' f �__. nO..SII I �jk'•o I 11W,, x>T,SZya --3b _ Ns ,° oav W O ' L D 5 L O G iK £ Q.. I 1 � .••run° rt I 4r •-•�' I �� _ ' I � I r i� - � _J�jl____�„ I.'".� -11 k �, 2� i _ _ L. I �iqP ; 1,--- 11•/ I , .ss;13�i'" `fie~; '_ ilia_ _,. �. A `'"1 •I z :-�,,. r LC-a:c 4.i rW.Lj �" (' ) { � ; �i � l i .� •�'.'1 �� ' i .4� I 1.,. 1. , av iw m �Daw •,• .I I r%. T • 8''4 I (04 s tl a _ 1� I ..._ '1 (° � r 'I ryrd-r '+— 1 I I l n� 11 I ') I PROJECT NO. SEVEN, S%VNAMING POOL ACCESSIBILITY There would appear to be only two options for making the swimming pool ' in the Civic Center accessible to the physically handicapped. Option No. One: Provide a slide entrance to the pool, the top of the ' which is at 1811, or wheelchair seat height, .;o handicapped person can sit on the slide and slide Into the water. In this option, exiting is more ' difficult and would require a lift operated by a second person to lift him out of the water. ' Option No. Two: This option would contemplate installation of a set of steps extending 2' into the water and 18" , or wheelchair height, above the level of the pool bed. ' The intent of the steps would be to allow a person In a wheelchair to roll up to the steps and transfer his body to the first step as he would from a wheel- ' chair to a seat. He could then progressively move down the steps one at a time until he was in the water. Exiting the water would be done in a ' reverse fashion. it would be possible to use steps in conjunction with a slide, but they could be used Independently. This option would allow a handi- ' capped person to access and exit the pool viithout additional help if he was able to perform this type of maneuver. ' Recommendation: The second option would seem to be preferred as it would in and out of the pool allow the City to avoid the liability of lifting persons this option Is ;8,000 ' by City employees_ The preliminary cost estimate of of stainless steel In such which would contemplate a set of steps constructed be from the pool and set off to the side during a manner they could removed ' competitive swimming. 1 UEMORANDUM DATE: April 15, 1977 TO: Neal Berlin and City Council FROM: Dick Plastino, Director of Public Works /n RE: More information on resolution prohibiti g%parking on the west side of Gilbert Court This was item no. 20 on the agenda of April 12, 1977. Public Works had received a request from ACT to remove parking for a short distance north of an exit from a large parking lot. ACT rents a building in this area and they have been having problems with sight distance when pul ling out of the parking lot. Removal of parking would be a good feature from a traffic safety standpoint, but examination of the entire length of Gilbert Court reveals that almost identical situations exists throughout this light industrial area. After further consideration of the matter, Public Works would generally recommend one of two choices. Dither drop the matter and accept the fact that this light industrial area has some traffic sight distance problems or prohibit parking on both sides of the street. Prohibition on both sides of the street will create some parking problems since there is probably not enough off-street parking to assume the load. cc: Ian Robertson Basic Grants 1213 Cilbert Court Iowa City, Iowa 52240 i • City of Iowa CAY DATE: April 21, 1977 TO: Neal Berlin and City Council FROM: Dick Plastino, Director of Public Works RE: Gravel parking lot at the Moose Lodge In 1962, the City adopted an ordinance which required paved parking lots for all zones in the community except R1 and R2. In 1974, the City adopted an ordinance which deleted the R1 and R2 exclusion. The building the Moose Lodge is now housed in was originally constructed in 1962 as a church. At that time it was exempt under the R1 and R2 exclusions since this building is in an R2. In 1973, an addition was added to the building by the Moose Lodge. In 1973, there was still no requirement for a paved parking lot since it is in a R2 zone. In summary, the Moose Lodge was in compliance with all ordinances at the time the building was originally built and later when an addition was added on. The deletion of the R1 and R2 exclusion cannot be made retroactive and the Moose Lodge is pennitted to have a gravel parking lot. I have sent a letter to the Moose Lodge indicating the displeasure of residents of Southl awn Street and have asked them to give it some kind of dust treatment or permanent asphaltic concrete surface. 1' E Lowe Illy �r April 22, 1977 The Moose Lodge 2910 Muscatine Iowa City, Iowa S2240 Dear Sirs: The City is receiving complaints from residents on Southlawn about the dust generated by the gravel parking lot serving the Moose Lodge. No City ordinances require a paved lot; however, in the interest of neighborhood harmony you may wish to give consideration to either a dust seal or a permanent asphaltic or concrete surface to alleviate the dust problems. Sincere , R ch r Plastino Direc of Public Works RJP/JP cc: Neal Berlin City Council CITE' OF IOWA CITY CIVIC CENTER, 410 E• WASHINGTON ST. IOWA CITY, IOWA 52240 319.354 1800 Cty of Iowa City MEMORANDUM DATE: April 15, 1977 City Council TO: Neal Berlin, City Manager FROM: Rosemary Vitosh, Director of Finance PJ RE: Bond Issue The attached summary of Capital Projects as budgeted for in FY 77 and FY 78 shows the projects which are to be funded by general obligation bonds. Two of the projects, the Equipment Repair Facility and the Animal Shelter, require voter approval and thus cannot be issued now. Per my discussions with Dick Plastino, construction on two other projects - the Keokuk/Hwy. 6 Intersection Improvement and the River Corridor Trunk Sewer - will not begin prior to Spring, 1978 and bond issues for those should be deferred until that time. By eliminating these four projects and adding the estimated $2.3 million for the Pedestrian Mall Improvements, the total funding required for a G.O. Bond issue is $3,065,000. The City's debt margin is computed as follows: Total Assessed Valuation $447,160,914 5% Debt Limit (State Code) 05 B-8—,04-6 80% Debt Limit (City Fiscal Policy) .80 TOTAL ALL0WLE DEBT $ 17,886,436 The City is well within the debt margin as illustrated by the following: Outstanding Debt as of 7/1/77 will be: $3,795,000 Recommended Bond Issue 3,065,000 - 3,� ^^ $6,660,000 I request that Council approve the bond issue of $3,065,000 so that Finance can get started on the preparatior and marketing of the bonds. The following tentative time schedule is suggested: April 25 - Informal Council Meeting to discuss bond issue "May 3 - Resolution setting Public Hearing date for bond issue for May 17 adopted by Council May 5 - Iluhlication of Notice or Hearing 892, 0 0 Bond Issue *May 17 - *May 31 - June 9 - June 16 - June 23 - Week of July 18 - -2- April 15, 1977 Public Hearing on issuance of bonds Resolution directing advertisement of bonds adopted by City Council Notice of Bond Sale published for first week locally and in the "Bond Buyer" Notice of Bond Sale published for second successive week locally Bond bid opening. Special meeting of City-.,, Council to adopt resolution authorizing debt service levy Deliver Bonds and receive proceeds *Formal Council meeting 4/15/77 CAPITAL PROJECTS INVOLVING GENERAL OBLIGATION BOND ISSUESS V GIN. REV. PROIECI COST G.O . BONDS FEDERAL AID STATE AID SHARING BUDGETED IN 17 77 Waste Water Treatment Facility - Infiltration/ Inflow Study $ 92,000 $ 18,400 $ 69,000 $ 4,600 $ -- Muscatine Avenue Improvements 700,000 210,000 490,000 - -- SYcamor'e/Hwy. 6 Intersection 30,000 21,000 --- 9,000 -- East-West One Way Couplet #2 71,600 21,480 50,120 - -- Iil1DGE1 ) IN FY 78 . JCantinued Development -New Parks 50,000 50,000 - rmon Trek Blvd. 260,000 78,000 182,000 --- _- City Bridge Repair Project 275,000 275,000 --- --- *Equipment Repair Facility 3,588,481 3,560,000 --- --- 28,481 #Keob*41iwy. 6 Intersection 176,000 52,800 123,200 --- Riverside/Benton Intersection 91,000 91,000 --- -- #River Corridor Trunk Sewer 2,000,000 2,000,000 --- - *Animal Shelter 175,000 3-7S,000 --- -- Pedestrian Mall (Estimates): College 8 Dubuque 1,800,000 1,8 00,000 -- - Other 500,000 500,000 - -- $ 9,809,081 $ 8,8 52,680 $ 914,320 $13,600 $ 28,481 VOTT:R APPROVAL NBCGSSARY (3,763,481) (3,735,000)--- ... (28,481) FUNDING TO BE MAYED (2,176,000) (2,0 52,800) 123 200 - --- $ 3,869,600 $ 3,064,880 $ 791,120 $13,600 $ -0- • *Bonds requiring voter approval #Project not to begun until late PY78 or FY79. J. C kity of Iowa Cit# MEMORANDUM DATE: April 14, 1977 TO: Neal Berlin, City Manages FROM: Angela Ryan, Asst. City Attorney a,/ (/ I RE: Proposed Use it or lose it Ordinance FACrS v v The Council is considering an amendment to the zoning ordi— nance which requires that site development plans be submitted, building permits be applied for, and construction begin within a specified time after a change in the zoning classification or the property will revert to its prior classification. What is the case law regarding such a provision? A "use it or lose it" provision that required that construction be commenced within a specified period of time after a rezoning or the property would revert to its original classification was upheld by the Court of Special Appeals of Maryland in Colwell v. Howard County, 354 A.2d 210 (Md. 1976) . Wile the Court stated t ere were a few cases dealing with the concept, all of the cases cited involved a similar provision in the issuance of special use permits and building permits. Therefore, this is a very new concept with little case law. The Court distinguished the provision from Contract zoavng since it applied to all property which was rezoned. It also stated that retroactive statutes are not favored even when t:key do not conflict with vested or other rights guaranteed by the Constitution. in light of the language in Colwell regarding retroactivity and the fact that it is the only case on point., it would be preferable to make such a regulation prospective. UM; 0 April 18, 1977 iowa cil y r .a^ Approximately one year ago you had received a proposed excavation ordinance and I received comments from many plumbers and excavators throughout the Iowa City area. Enclosed is another rewrite of that ordinance and I believe we have worked out most of the rough spots. The main items of interest are as follows: Section 3 - Almost. everyone has to get a permit before they start digging. Section S - Surety bonds required to protect the City from lawsuits. The amount of this is $10,000. Section 6 - Performance bonds are not specified; rather I put in cash deposit. To the best of my knowledge no one has ever collected on a performance bond from an insurance company without taking them to court. I'm asking for a cash deposit and two-thirds (2/3) of this will be returned promptly upon completion of the patch over the excavation. As an alternate, a yearly deposit can be put down to covet all excavations. This is probably the biggest change in the ordinance but if backfill and patching is done properly the amount of the deposit should not be too burdensome. Section 11 and 12 - These specify backfill provisions. Essentially backfill under a paved surface can either be the excavated materiel put back and tamped or granular material such as sand. Section 15- This decribes the type of patches to be placed and essentially are the some standards we are using now. Section 14 - This gives 14 days to complete the patch. CITY OF IOWA CITY CIVIC CLNTER, 410F. WAS14INGI ON ST IOWA CITY, IOWA 52240 319 354 1800 _Z_ Please give this a look and I will contact you in a week or two and come down to your place of operation to discuss this. After I receive your comments, changes will be made as necessary and the document will go to the City Council. Since y, ichard J. Plast' o Director of Publ Works RJP/jp cc: Neal Berlin, City Manager City Council 3h • • No. PQ A PQ;c 4 LOCATION OF WORK: EXCAVATION Type of Surface _ Backfill Materials Start Date Finish Date SKETCH OF JOB LAYOUT Conditions on Permit Initial inspection Comments! Final Inspnction Comments : Final Deposit Returned CITY OF IOWA CITY, IO:VA EXCAVATION PERMIT 'y coo ;+y Date: Name: � `^'• O' Address: Director Permittee Dute 2/3 deposit returned 0 Em 0 q� CC: " 0 PERFORMANCE DEPOSIT SCHEDULE (Proposed) SPECIAL'DEPOSIT For first 100 ft or less $150.00 For each additional 100 ft or less 100.00 Minimum deposit 150.00 ANNUAL DEPOSIT For all excavation $1500.00 •`V ORDINMICE N0. a p� An Ordinance regulating the opening and excavating of public placbst,�'i�quiring a permit and payment of a performance deposit; imposing requirements �fgh�'tjie protection of life and property in connection with excavation work, including traf,k and pedestrian safeguards; regulating the backfilling and resurfacing of excavations; and Prescribing penalties for violations of these provisions. SECTION 1. This Ordinance shall be know as the "Street Excavation Ordinance of the City of Iowa City, Iowa." SECTION 2. For the purposes of this Ordinance, the following terms, phrases, words and their derivations shall have the meaning given. A. "Excavation" shall mean any opening in the surface of a public place made by any means. B. "Public Place" shall mean any public street, way, place, alley, sidewalk, park, square, plaza, any City -owned right-of-way or any other similar public property owned or controlled by the City of Iowa City and dedicated to public use. C. "Substructure" shall mean any pipe, conduit, duct, tunnel, manhole, vault, buried cable, or wire or any other similar structure located below the surface Of any public place. D. "Person" shall mean any person, firm, partnership, association, corporation, municipal department, company or organization of any kind. E. "City" shall mean the City of Iowa City. F. "Director" shall mean the City Manager of the City or his/her authorized repre- sentative. G. "Specifications" shall mean the latest edition of Standard Specifications for Construction on Primary, Farm to Market, Secondary, State Park, and Institutional Roads and Maintenance Work on the Primary Road System, Iowa State Highway Commission, Ames, Iowa. H. "Utility' shall mean any person engaged in providing a particular service to the general public. SECTION 3. EXCAVATION PEMMIT All persons making or filling any excavation in any public place shall first obtain a permit from the City except as provided in Section 20.11 No permits are required for 1 substructure installation in a new subdivision prior to acceptance of the street i improvements by the City. SECTION 4. APPLICATION No excavation permit shall be issued unless a written application is submitted to the Director on a form provided by the City. The application, when approved, shall constitute a permit. Sl-ILZILIN S. SURIM NOXI) Before an Excavation permit is issued, the upplicunt shall deposit with the City a suroty bond in the amount of $10,000, payable to the City. M annual pond miry be given under this provision. h4l,lic utilities regulated i,h the nowt. (:omt<tt.c i:unnusbiom. liersons or uulrties holding a franchise from the City, City depurtrmentt, and otic -r goverrancmil ugencivb, nv+y be relieved of the old il;ut inn ttJ tiubnntt ing snch n horld. :i7:CI'1C1� b. 1'I:ITOIS�11'�l'I. 171Ar7IiPJ'': Yurlunuut::r dcpusite, vrr rryuind Jut an} rxeucnlI'm Ili it "Ill iu plao'. betvnit� rrilmrrd uruirr thu, sari nm shrill lm a tush sreurrty. A. Purpose of Deposits: All special or annual deposits shall serve as security for the performance of work necessary to put the public place in as good a condition as it was prior to the excavation if the permittee fails to complete the work under the excavation permit. a•.. B. Special Deposits: i, The application for an excavation permit shall be accompanied with a deposit, made in' accordance with a rate schedule adopted by City Council resolution. s C. Annual'Deposits: n7r�aAIai lieu of individual. special deposits, any person intending to make openings, cuts or excavations in public places may maintain, with the City Treasurer, an *4 a, . rE a?; annual deposit in accordance with a rate schedule adopted by City Council resolution. ,Refund or Reduction of Special Deposits: lilwn Director approval of the work covered by the permit, two-thirds of the special deposit shall be promptly refunded to the permittee, and the balance' shall be released to the permittee one (1) year latera E ',"-Ref undor Reduction of Annual Deposits: M;^%1u:;4a', Upon request, two-thirds of; any annual deposit shall be refunded at the end of e one year period for which the deposit is made, The balance of the annual' -_ deposit shall be released one year later. If no refund request is received, the deposit shall be` carried over for use as the annual deposit the following year. F Use of Deposits :.+)ut os S: be'used to pay ,the cosh of any work the City performs to restore or 4 kmaintainithe public places°in the event the peimittee'fails..to perform the work. amount released'to the permittee shall be reduced by the amount expended G Vot,Exceptions 'from Deposits ents or under Cfranchise.'issued by tthesons lCityeof regulated byrthe Iowa utilitiesor opera oCommission, "ic;,r a;permit;may be:granted without making such deposit., In such cases, ,the permittee 'shall be liable for the actual cost of any: Work done by the City in restoring t"ry Yri ;n the area ;The City may, in the future; require deposits from any such permittee if abill rendered in accordance with this section becomes delinquent. a TRAFFIC CONTROL 5; urs ' A�dA i ,.No permittee shall interrrupt access to and from private property, block,emergency- Q„ ��vehielas;,block, access to fire hydrants, fire stations, fire escapes, water -valves, the k4;imderground vaults, valve housing structures, of any other vital equipmet Will ntasas designated 14 is i R+�'`; assisetarDice�andrtheia provalstreet ofcthe Director. �ulItashall bthe op the 8responsibilitytof the . x permittee to notify and coordinate all excavations with the Police, Fire, and Transit `y�AA•(<'M Departments z,,'. )' .Q. 1. $ ���.,The,petmittee.shall take appropriate measures to assure that traffic conditions as X14, 'l r Hoar normal as possible shall be maintained at all times. Type;I and Typa II barricades, as defined in Part VI of the Manual of Uniform Traffic ' ,'w"Control Devices, must be used whenever it is necessary to close a traffic lane or a sideoalk.;,"Barricades are to be supplied by the permittee. If used at night, they «, must be reflectorized, and must be illuminated or have barricade warning lights. visa a general guide for all maintenance and construction signing, Part VI of the anual!on Uniform Traffic Control Devices shall be used. The permittee shall' illustrate on the: excavation permit the warning and control devices proposed for use. At the s y ._ .: roauestof tho Director, such warning and control devices shall be increased, decreased r ,.. or modified. s of illumination. 1 oil flares or kerosene laterns will not be allowed as mean SECTION 8. PROTECTION OF PAVED SURFACES FROM EQUIP,\SENI' DAMAGE Backhoe equipment outriggers shall be fitted with rubber pads whenever outriggers are placed on any paved surface. Tracked vehicles are not permitted on paved surfaces unless specific precautions are taken to protect the surface. The permittee will be responsible for any damage to existing pavement caused by operation of such equipment and, upon order of the Director, shall repair such surfaces damaged by excavation equipment. Failure' to do so will result in use of the performance deposit to repair any damage. y SECTIQV 9. PROTECTION OF ADJOINING PROPERTY ::The permittee shall protect from injury any adjoining property by providing adequate F' support and taking other necessary measures. The permittee shall, at his own expense, ` shore up and protect all buildings, walls, fences or other property likely to be damaged during the excavation work, and shall be responsible for all damage to public or'private property.or highways, resulting from failure to properly protect and ? `carry -out excavation work. Failure to follow the provisions of this section will y " ,``-result in the use of the performance deposit to repair damage. 4. V .. .. SECTION 10. RELOCATION AND PROTECTION OF UTILITIES . the permittee: shall notify the owners of all facilities in the excavation area at .least, twenty-fourhours prior to excavating except as provided in Section 20 /9 ,(24) The. cost of moving facilities shall be paid by the permittee. iY 7ie peimittee shall support and protect all pipes, conduits, poles, wires or other :•..'apparatus which may be affected by the excavation work. The permittee shall inform + `^_ itself`as.to the existence of all underground'facilities within the excavation area exposing priorto machine digging and protect the same against damage. ^" SECTION•11. BACKFILLING OF EXCAVATION UNDER AND WITHIN TRO FEET OF PAVED SURFACES F The trenches for all substructures that lie under paved surfaces or traveled ways add Nr:',within ctwo .,(2), feet .of paved surfaces shall be backfilled with excavated material to aq titrequired` grade. in. layers not to exceed eight inches (8"), and each layer shall be t¢s T -- it ular meetinaospeci- modifiedr bro r f tions may bplacedy'anyprocedue which results ibackfn compaction. .also SECON_12 ,'.BACKFILLING OF UNPAVED AREAS AND PAR15VAYS R ," r,� + r " . �. �• , w Excavated soil should be carefully deposited and satisfactorily taped in uniform s ,layers;not'greater than', eight inches (811) in thickness until the backfill, reaches the tN�4� top.of;,the;pipe.`''The remainder of the trench shall be backfilled in uniform layers not exceeding:twenty-four inches (2411) in thickness, and satisfactorily taped to � }` "withizCone'foot�of. the surface. >"",The backfilling operation shall. continue with soil :. until,the backfill remains slightly above by the ground level. Excess material shall + be disposed of *�aM v 11a ; Granular, backfill meeting City specifications may also be used. +a we+i,/'., nn.. ei. — U,,'lµ7M1trvel M '" {'hi. SN ✓'Id[C .c �i== SECTION 13 REPAIR OF SURFACE ask' The Director may specify the type of resurfacing required for any excavation; however, in the 'absence .of specific direction from the Director, the following specifications i. ,: shall •be used for resurfacing of an excavation: . "4 A. •,HipJitype asphalt streets. The pavement shall be neatly sawn one foot (11) back om each Side o • up excavation and removed to a depth necessary to reach undisturbed subbase or soil. A concrete patch equal to the thickness of the eXisting pavement,, but in no case less than six inches (6) thick, shall be placed,in the excavation mid brought up to a point two inches (211) below the final. surface. ,The, permittee will complete the excavation with two inches (2") M4 of asphalt: The concrete patch used in excavation work shallbe an mix and shall meet Section 4340, of the Specifications (see Section 1, definitions). B. Concrete streets. The pavement shall be neatly sawn and removed one foot (11) " ac from each side of the excavation to a depth necessary to reach undisturbed i!7, •• `' SUbbaSe soil. if a construction or expfinsicion joint is within five feet (51) of the edge of the patch, the surface shall be removed back to this joint. A concrete patch equal to the thickness of the existing pavement but in no case less than six inches (6") thick shall be placed using a M4 mix in accordance with Section 4240 of the Specifications. C. Brick streets. Excavations in brick streets shall be repaired using the -' original bric or other brick suitable for a traveled surface. A six inch• (6") concrete base shall be poured using a M4 mix. Above this, a sand -cement cushion one inch .(1") thick shall be adjusted so that when the bricks are paved -' and rolled the top surface of the bricks will be at the required finished grade. The joints between the bricks shall be hand tight and shall be no greater than a inch. A dry mixture of one part Portland cement and three parts sand shall be be spread over the top of the patch until the joints are completely filled. The surface then shall be fogged lightly with water. ' D. Low type streets. Mien a street consists of a seal coat, dust seal or other rn, 1tFi as type surface, the Director may waive the prescribed repair requirements ands specify alt patch at least two inches 2" thick. The asphalt shall asphalt ^ e an ( ) P be rolled with a rptired vehicle until a dense, tight surface is obtained. Sidewalks drivewa s curbs and tter other structures. Whenever an excavation cuts a si etiaal , rivetiaay, cur gutter orother structure, the excavation 'shall be backfilled as described in Section ll. A neat saw cut shall be made twelve, inches (1211) back from each side of the excavation to undisturbed soil; t� however, on sidewalk, the pavement shall be removed back to the nearest contraction ` s7w i or expansion joint. All broken or spalled concrete or structure material shall 3t4d be,removed and the surface shall be replaced using an M4 mix in accordance faith `Section 4240: of the Specifications. - - F Par laaa s and other un raved azeas.' In cultivated grass areas, a minimum of six s�wr inches.'),of"top soils a11Tie removed before excavation begins. In uncultivated .•areas, no preparationisneeded prior'to excavation. Backfilling shall be completed as. described in Section 12. The surface of cultivated grass areas Et "k shall be. replaced with top soil and seeded. It is the responsibility of the permittee to:establish a good stand of grass. The area ea shall be lefree from 44 debris and clods On steep embanlmrents or upon request of the Director, sod or other erosion control techniques shall be used for restoration. �t'�tua%G Saw cuts ° All saw cuts are to be made to a depth of two inches. The remainder „,i may be broken off below that point in a vertical plane. fMhhs H r Bor]ng or other methods to prevent cutting of pavement will be required upon of: the Director TIME,OF COM MION �'wl Allexcavation work •and backfilling covered by the permit shall be completed in a AiV,4 prompt'manner'as determined by the Director. After completion of the excavation and fourteen i't;backfill work''restoration of the surface shall be completed within (14) ,- days(�unless a trme extension is granted by the Director.` ��a�i:aa� SECTION 15 •• NOISE; DUST AND DEBRIS y„Yf 'Each perautteershall conduct excavation work in such manner as to avoid unnecessary urconvenience and annoyance to.the general public and occupants of neighboring r property. In the performance of; the excavation work, ,the permittee shall take "appro riate'measures'to reduce noise,` dust and unsightly debris. No work shall be - pp tl air done -between the.hours of 10:00 P.M. and A.M., except with the express written _6:00 permission of the City;'or,in case of an emergency. �. SECTION 16 INSPECTION Random inspections.may be made of procedures described in this Ordinance and the permittee shall'. corrects procedure his if so ordered by the Director. Failure to do so will,result`in use of the performance deposit to correct or complete work. °' SECTION 17. ' CLEAN-UP rf ;As the excavation work progresses, all public right-of-ways and private properties shall be thoroughly cleaned of all rubbish, excess earth, rock and other dobris: All clean-up operations shall be done at the expense of the permittee.- If the permittee ; ^ [fails to clean-up within.twonty-four (24) hours after notice, the Director shall authorize the work done.Such work shall be paid for with the performance deposit. r ' _Sw TON 1"o.-T..E`: a IN PIP£ L^.YD?S Except by special permission from the Director, no trench shall be excavated more than 200 feet in advance of pipe laying nor left unfilled more than 100 feet where pipe has been laid. SECTION 19. DIERGENCY EXCAVATION Nothing in this Ordinance shall be construed to prevent the making of such excavations as may be necessary for the inenediate preservation of life or property. The person making excavation shall apply to the City for such a permit on the first working day after such work is conmienced. SECTION 20. PRESERVATION OF MONINV:NIS The pennittee shall not disturb any surface monuments or hubs found on the line of excavation work unless approval is obtained from the Director. SECTION 21. PE.NALITIES Any person violating any of the provisions of this Ordinance upon conviction, shall be punished by a fine of not less than dollars ($100.00). SECTION 22. REPEALER Section 9.60.3 of the Diunicipal Code ay in conflict with this Ordinance, are he ow Mr. Bruce Glasgow 834 North Johnson Street Iowa City, Iowa 52240 April 19, 1977 Dear �etteraopp . sgo,oing Your he Flood Plain Ordinance was made a part of the public hearing held on this subject on April, 12. Thank you for expressing your views to the City Counci I. If I Vcanbef anyassistance, please do not hesitate to contact me. rs, Neal G. Berlin' City Manager 1s CITY OF IOWA CITY CIVIC CENTER, 410 E. WASHINGTON ST. IOWA CITY, IOWA 52240 318.354.1800 W. L ^,0.- SOF April 19, 1977 Mr. Harold Stager President, Iowa City Federation of Labor AFL-CIO' 1221 Kirkwood Avenue Iowa City, Iowa 52240 Dear Mr. Stager: The City Council received and placed on file your letter at its regular meeting of April 5, 1977. The City Clerk's records indicate Mr. LaVern Shay was first appointed to the Board of Electrical Examiners and Appeals to fill a two-year unexpired term on July 1, 1971. He was reappointed to a four-year term on October 26, 1973. This term will expire October 26, 1977. The Board of Electrical Examiners and Appeals consists of five members: the City electrical inspector, a representative of the public, a licensed electri- cal contractor, an electrical journeyman (the contractor and journeyman may not be from the same business firm), and one professional electrical engineer. All vacancies on boards or commissions are advertised in the Press -Citizen. The public is encouraged to apply for any openings for which they qualify. All vacancies are advertised for thirty days. The City Council then meets and choses a qualified person to fill the position from all applicants. If the Council feels there are not enough applicants from which to chose, the vacancy is readvertised. Usually there are not very many qualified candidates. I would appreciate it if you would encourage interested citizens to apply for such vacancies with the -City Clerk. 1 hope this information will answer your questions please let me know, bin el ours, 600000 Neat G. er in City Manager If you have further questions, cc: City Council CITY OF IOWA CITY CIVIC CENTER, 410 E. WASHINGTON ST. IOWA CITY, IOWA 52240 319-354.1800 97/ • April 18, 1977 The Rev. Paul Sandin 2811 Eastwood Drive Iowa City, Iowa 5224 Dear Rev.S in� The City Council received Sand placed on file your letter concerning the proposed cemetery ordinance. Your comments were made a part of the public hearing that was held April 12. Thank you for making your feelings known to the Council. If I can be of any assistance, please do not hesitate to contact me. Sincerel you , ea G. Berl City Manag Is CI Y OF 10VVA CITY, CIVIC CE"1 TEfi, 410 E. WASHINGTON ST. IOWA CITY, IOWA 52140 319354-1800 8712 0 to we clly Mr, Charles Russell Morgan Protective Association for Tenants Iowa Memorial Union Iowa City, Iowa 52242 Dear Mr, Morgan: April 19, 1977 Recently, in a letter to the City Council, you indicated your support of the position of the University Veteran's Association, as detailed in their letter of January 18, 1977, concerning the accessibility of rental housing, There currently is a bill in the State Legislature which would correct the matters which were brought to our attention in that earlier letter. You may wish to discuss this matter with area legislators and offer support for that position, Sin re yours �,. OP Neal G, Berl City Manager is CITY OF IOWA CITY CIVIC CENTER, 410 E. WASHINGTON ST, IOWA CITY, IOWA 62240 319.3641800 $73 PAIS PROGRAM Quarterly Report April 1, 1977 NUMBER OF MATCHES F*EIVED AlY 1 5 1977 1-76 1-77 4-77 Boys matched with male volunteers 19 34 46 Boys matched with female volunteers 5 4 Girls matched with female volunteers S 25 25 TOTAL CHILDREN MATCHED 27 64 75 Volunteers matched with 2 siblings 1 3 2 TOTAL MATCHES 26 61 73 Average length of existing matches 7 9 mo. 9 mo. N of (*) match months this quarter ? T 90 on going match (months) 7 ? 665 M One match month (a.m.) - services to 1 volunteer, 1 child, & parent for 1 month. I L 8%y 1 SERVICES THIS QUARTER \. The Pals Board held an appreciation event for volunteers and youngsters at Happy Joe's Pizza and Skateland. There were 128 people in attendance including board members. The expense was covered primarily by donations from the Iowa City Optimist Club, Scott Tyree of Happy Joe's, Frank Grell of Skateland, and an anonymous donor. The event was tremendously successful at generating enthusiasm and renewing interest and awareness within the program. LIM There have been 5 orientations for volunteers with attendance varying from 23 to 2 people. over 3/4 of those attending made further application. There were two in-service meetings for matched volunteers, one involving a talk onways to promote informal learning by a school psychologist. The other meeting resulted in a volunteer -planned winter outing for the kids at Lake McBride Field Campus. Two groups (Beta Theta Pi and Iowa City Junior Womens Club held activities for the children with over 501 of those invited attending. Five volunteers have been alternating as co -leaders for groups of 4 to 6 boys at the rec center on Fridays. This program, called Gap, is primarily for boys on the waiting list and those who especially need peer interaction. There have been seven of these small group meetings; all have been well received by the boys. The board has been meeting monthly. other board committees meeting include publicity, membership, and nominatir►g committees. The newsletter continues to be sent to volunteers monthly. We would like to find funds to send it to the parents of children in the program also, as it has been a valuable means of increasing internal communications. Since acceptance of new referrals of children was cut off (due to program reach- ing capacity) we have received 16 requests from agencies and parents that WS have not been able to act on at this time. 1/18/77 Julie Zimmer Pals Coordinator ``_ "' RETAKE OF PRECEDING DOCUMENT STAFF REPORT To: Planning and Zoning Commission Prepared by: Dennis Kraft Item: Rezoning of Braverman property located at intersection of West Menton Street and Mormon 'Trek GENERAL INFORMATION Owner: Requested action: Location: Existing land use and zoning: Surrounding land use and zoning: Applicable regulations: 60 -day limitation period: SPECIAL INFORMATION Public utilities: Public services: Iransportation: Physical characteristics: (late: April 21, 1977 M. N. Braverman City Council set public hearing to consider rezoning of property from CH zoning to PC or R3A or R3. West side of Mormon Trek Boulevard at the intersection with West Benton Street. Undeveloped and CH. North -- R3 and Mark 1V Apartments; East -- RIB and undeveloped; South -- 113 and undeveloped; West -- R3 and soon to be developed apartment complex. Zoning Ordinance and Large Scale Non- residential Development Ordinance. May 28, 1977 Adequate water service and sewer facilities are available. Sanitation service and police and fire protection are availuble. Vehicular acc r es would be provided from Mormon Trek Boulevard, and possibly West Heaton Street extended. The creu is rrt•st•rtly or ur lnwa City bus route. The subject property is relatively flat and contains a portion of the Nylloa creek F joudl.luin. h'et soil ore found within and adjacent to the floudpluin and compose appruximutcly 81A of the sitr, The northern 4975 • z • margin of the site is characterized by relatively steep slopes. This topography makes up approximately 10% of the site. Parking would be permitted within the floodway of Willow Creek, however, structures would not be able to be developed there. INITIATION OF REZONING REQUEST The rezoning of this property is being considered by the Planning and Zoning Commission and the City Council following action taken by the City Council to establish a public hearing to consider the rezoning of the property. This Zoning Ordinance amendment was not initiated by the owner of the property. Recent work completed as a part of the Iowa City Comprehensive Plan has indicated that the population for Iowa City for the year 2000 is expected to be lower than earlier anticipated. Studies prepared in the 1960's indicated a greater population and greater level of University enrollment than is now expected for this area. In that the amount of commercial activity for an area is directly related to the population of the area, it is reasonable for the City Council to reconsider the 15 acres of Commercial Highway zoning which presently exists at the subject site. According to recent population estimates completed by the Cityts Department of Community Development, it is expected that Iowa City will have a population of 60,132 persons by the year 2000. This represents an approximate increase in population of 11,000 to 12,000 above the present population figures. Recent University enrollment figures have also indicated that, unlike earlier anticipated, the enrollment of the University will level off and then probably somewhat diminish into the next decade. In analyzing the future population growth of the lown City area, the total growth anticipated for the year 2000 was distributed to various parts of the City. This distribution process revealed a potential growth of 5,000-6,000 persons within the commercial service area for this part of the City. It was further assumed that the remaining development would occur largely in the northeast and eastern parts of the community with probably a lesser amount of growth in the southern purt of Iowa City. MFTIMPOLOCY A trade area mmlysis was carried out as it purt of this study and the existing commercial areas located in the Wardwuy Plaza, Riverside luive area , and in the Highway 6-218 area in Coralville were utilized to help determine where the trade urea boundaries would be locuted. 'Fite trade areas us established (sec roup) indicate an approximate existing populution of 5,000 persons for the service area. This would be ubout a atinimum threshold population fur the ir:itial development of to small nvighburhond shuppinp area. with IIIc incrna_od prowth Which ib 1jAe1) to uccur :i' the area b) the )ear :u1iL, ti xfu dete•rn!;ltca thus an area of approximately right acres would appear to lot sufficient ^r.e provide -3- 0 necessary neighborhood commercial services. Facilities envisioned appropriate for this area would include a major super- market, a drugstore, a barber shop or beauty salon, a dry cleaning pickup station, a small hardware store, and possibly an automobile service station. The above-mentioned eight acres would provide sufficient space for most of the above-mentioned facilities and would also provide additional adequate area for parking, circulation, buffering and landscaping. This type of commercial development would appear to be consistent with the type of outlying neighborhood commercial facility desired in Iowa City. RECOMMENDATION It is recommended that approximately eight acres of the subject site be rezoned from CH (Commercial Highway) Zone to PC (Planned Commercial) Zone. It is further recommended that seven acres of the subject parcel be rezoned from CH to R3 Multi -family Residential Zone, The Planned Commercial Zone would allow for a more successful integration of a neighborhood commercial facility into the fabric of the neighborhood. The PC Zone would make specific provision for various types of site controls including general land use arrangements, use locations, traffic circulation patterns and access control, and for the buffering of the commercial facilities from the adjacent residential areas. The present 15 acres of Commercial Highway zoning represents a greater amount of commercial land than is apparently needed for this neighborhood according to our initial economic analysis. Furthermore, development which could be permitted by the CH Zone potentially could be more incompatible with the character of the surrounding residential area. The remainder of the subject parcel was recommended to he rezoned R3 because this would be consistent with the adjacent existing land uses and the additional R3 zoning which presently exists along the west side of Mormon Trek Boulevard. The location of an eight -acre commercial shopping facility in this area would both allow persons within the neighborhood to travel a relatively reasonable distance (one-half to one mile) to obtain various types of commercial goods, and would also allow residents of the nearby multiple family residential areas to walk to this shopping area if they so desire. Presently, no one living within this area is within easy walking distance of any commercial facility. The Willow Creek Floodplain is located within the subject area and this facility does need to be given consideration in the development of this site. ALTERNATE SITE The economic demand study which was carried out for this urea was of a relatively general nature, and it established the need for u commercial area in the vicinity of the subject property. This commercial facility could ulso be located slightly south of the 9UbieC1 Itruperty u] 0111! the west side of Mornxm 'Trek Boulevard. The alternate site is presently wide[ the sant ownership us thr subject property and does hove both udvanr uhes and disudvuntages over the subject property relutive to future commerrciul development. Specificully, the • -4- alternate 4- altarnate site docs have a larger arca of stceper topography (approximately 40 percent) but it does present the advantage of being located outside of the Wil low Creek floodplain and it does not contain the wet soil types found in the subject property. furthermore, it would be possible to provide a more convenient means of access for the alternate site if it were to be served by a road which would include the westward extension of West Benton Street west of Mormon Trek Boulevard being then tied to a north -south road which would extend southward to Rohret Road (see attached sketch). AITACHMENTS Location map, potential site development sketch for Alternate Site. O D • �UC�U 0 ME CI A ARE/, s S013JECT PROPERTY • EXIsT NG NBHD • COMMERCIAL '00 EXISTING POPULATION 0 POTENT]AL POPULATION J BY ........... . DATE .............. OUBJECT .................. ....... _..... ......... 0....... SHEET NO ......... OF CHKD. BY... ..... DATE ............ _.................... ..................._......_....................._. JOB NO.. . .............. ..... __........................................... .......................................................................................... ... I ..................... . W. 6E.11To11 SUBJECT PROPERTY-. ALTERNATE SITE 11 STEEP SLOPE WET SOIL ,100 YEAR CLOOOPLAIW i. • , " , , . *city of Iowa Cite MEMORANDUM DATE: April 18, 1977 TO: Planning and zoning Camiission FROM: Angela Ryan, Asst. City Attorney RE: Proposed Rezoning QUESTION PRESENTED What are the legal considerations in the proposed rezoning of the tract at Denton and Nionran Trek? OONCLUSION The City has the authority to rezone if circumstances warrant the change, if it is rezoned in accordance with the oorrprehensive plan, and if its action is neither unreasonable, arbitrary nor discriminatory. 4WOkT3 -1011 The test of whether a zoning ordinance is arbitrary, unrea- sonable or discriminatory is whether the neans enplcyed in the atteipted exercise of the police power have any real, substantial relation to the public health, safety and welfare. Hanna v. Rathie, 171 N.W.2d 876, 880 (1969). The courts, in many cases, have attested to lay down a defini- tive rule for the detxrmination of what is, and what is not, reasonable. In People ex rel. R. Larsen and Co. v. City of Chicago, 179 N.E.2d 676 (I1 iry is), the court stated: "In considering the validity of a given zoning ordinance, each case must be decided on its own particular facts, with due regard to the char- acter of the neighborhood, the classification and use of nearby properties, the extent to which property values are diminished by the particular restriction, the suitability of the subject property for the zoned purposes, and the gain to the public as cmpared to the hardship on the re- e't, mr-wr " In Clary v. 9orouyh of Eatontown, 41 N.J. super 47, the court stated at�i t zoning re guulations are to be formulated with reasonable consideration to the character of the district and its peculiar suit- ability for purticulaLr uses, and witf: a vier of rowwrvino ttw valix of property and encouraging the most appropriate use of lard through- out the muiicipality. The stendard is not the advantage or dotu,imwit to particular neighboring landowners question, but rather the effect on the economic, or political unit. or the owner of the property in entire conmmity as a social, The court will often examine whether the legislative bodies of the City made their decision after careful consideration of the facts and circumstances of the particular case. Keller v.City of Council Bluffs, 66 N.W.2d 113, 116 (1954). It is often critical of hasty a 9OFents in response to a landowner's proposed use. Any change must be in furtherance of sound comprehensive zoning. Pettin Asso- ciates Inc. v. Township of Dover, 316 A.2d 1 (1974), w}nch imWsition of zoning restrictions do not bear alike on all persons living in the same territory under similar conditions and circumstances is discrimina- tory. There must be substantial and reasonable grounds for the discrimination, when one lot or tract is singled out from the remain- ing portions of the same zoning district. Hernrvm v. City of Des Moines, 97 N.W.2d 893, 896 (1959). However, zoning or rezoning to centers at convenient locations in permitted. They do not constitute location, and extent are reasonable 168 N.W.2d 739, 745 (1969). provide for shopping and business residential districts is generally "spot zoning" where their existence, . Anderson v. City of Cadar Rapids, MINUTES OF STAFF MEETING April 6, 1977 Items from the Council meeting of April 5, 1977, were discussed: A question was raised about the parking lot at Washington and Clinton. When it was constructed, was it considered having an attendant rather than meters? There should be a report in the Finance Department which indicates this. The Finance Department was requested to furnish a report concerning the feasibility of removing the meters and making it an attendant lot. The Legal staff is to meet with Community Development regarding the provision in law written up in the Municipal League Magazine which says when property is rezoned it is to be used within a certain length of time or it will revert to its original zoning. The City Council increased the funding for the PALS Program to $11,200. The budget should be amended to show this increase which will come out of general revenue sharing funds. The City Manager's staff is to write to Boca Raton, Florida, for a copy of their recycling ordinance. The City Manager requested that the Finance Department furnish by Friday a date by when a report will be available on an alternative for the $2.00 parking ticket in the downtown area. During the public hearing on the Model Traffic Ordinance, a number of items came up whicn need to be clarified. The City Manager is to be informed if this can be done by Friday so that the ordinance can go on the agenda for the first reading. The Director of Parks and Recreation is to furnish to the City Council a status report on the lights at Mercer Park. Next week at the staff meeting the subject of priorities for the Resources Conservation Commission will be discussed. The department heads were requested to bring a list of priorities which this new Commission should be dealing with. The Director of Community Development was requested to inform Paul Glaves about the change in review procedure for urban renewal buildings. There wiII be a separate review by the City Council_ A problem arose during the discussion of the Model Traffic Ordinance. In a letter to Rev. Welsh, the Department of Public Works indicated a change would be made in the definition of an alley; however, this change was not made. it was noted that the names listed in the minutes of the March 24 meeting of the Planning and Zoning Commission are in error. The Department of Public Works was requested to check to see what the procedure is for moving a fire hydrant. At 1500 Lower Muscatine, a fire hydrant is located near a driveway which the owner wants to widen. Tire City Maiwger ib to be informed when the minimum housing code will be on the agenda. The -manner in which the City staff communicates with rotate 'legislators will be et;�n ed. The Director of Human Reletions will be checking with the Iowa League of Municipn hies 876 0 0 every Friday afternoon to check on the status of bills. Department heads will then be informed of anything relating to their department. The Legal staff and the City Manager will continue to review all bills. Bills that are of any consequence will be sent to the department heads by the Legal staff. If the department heads have any interest in those bills, they were requested to put it in writing and send to the City Manager's office. This matter will also be dis- cussed at each Wednesday morning staff meeting. Information of this type will also be passed on to the Legislative Committee of the City Council. The City Manager asked about the status of strip along the riverfront. The Director meeting of the Riverfront Commission and P on April 13 at 7:30 P.M. in the Recreation at that time. the recommendation for ownership of a of Parks and Recreation replied that a arks and Recreation Commission is scheduled Center and this subject will be discussed The Finance Director furnished to the department heads a copy of a memo regarding a vehicle pool. This subject will be discussed at the next staff meeting. The City Clerk advised that her office is having difficulty determining which drafts of ordinances and resolutions are the final copies. It will be a policy that all drafts will be typed on colored paper, dated, and marked with the draft number. The final ordinances and resolutions will be typed on white paper. ,. 0 0 M I NUTES RALSTON CREEK COORDINATING COMMITTEE April 12, 1977 MEMBERS PRESENT: Chet Orelup Jim Jacobs Roxanne Haldeman Jane Jakobsen Helen Kavanaugh Charles Eastham Julie Vann Jim Powers Dick Plastino Don Schmeiser Audrey Scott Florence Stockman Glenn Boutelle A e opy of an interim report on existing conditions in the Ralston Creek watershed was handed out. Jim Powers discussed the areas his firm would look into in preparing a final report on solutions. He discussed the inadvisability of removing restrictions in the creek in the upper parts of the watershed without corresponding action in the lower part of the watershed. Such actions would allevaite flooding higher up to the detriment of those lower down. He thought it would be perhaps 60 days until a rough draft of proposed solutions was prepared. There was discussion on the status of the East Side Detention Structure. It was stated that Hansen, Lind, Meyer will be put under contract to do the Environmental Review Record. This should be done within 6D to 90 days. A status report was given on all the other interim projects. Land is being acquired and all projects are on schedule. The Ralston Creek Coordinating Committee was informed of Council's decision to borrow approximately $400,000 of Ralston Creek funds to alleviate a cash low problem. It was stated that it was fairly certain the funds would be +eturned at the earliest in September of 1977 and perhaps at the latest by spring of 1978. It was rtated that the Flood Plain Ordinance wos up for Puh)ic Hearing { on April 12 and no problems were expected. The meeting was ser for May )6, 1977, in rhr Citv Manayer's Conference Room. Richard .t. Ila inn Director of Ulic Wor)s 977 • • City of Iowa City MEMORANDUM DATE: April 14, 1977 TO: Neal Berlin and City Council FROM: Dick Plastino, Director of Public Works RE: Monthly Report for March ENGINEERING DIVISION The Washin ton Street Amenities Pro'ect - Terminat ion date on this project or O'Brien Electric is May 15. We are encouraging O'Brien to get started on this and wrap it up since the community is get ting impatient. We have found a sign base that will look good in the Washington Street area and have ordered these from Neenah Foundry. Delivery is expected in four weeks. Muscatine Avenue Im rovements - Final plans specifications and costs estimates en ave besubmitted to the Iowa Department of Transportation. The bid opening is May 24. West Park Lift Station - Conversion from the existing lift station to the new lift station s ould occur during the second week of April. Storm Water Manual - Comments have been received from local engineers and a final document is being prepared for City Council. It is anticipated it will be submitted to Council for adoption April 26. Erosion Control Manual - A rough draft of this document has been completed and submitted to the Soil Conservation Service for review. This document should be submitted to Council approximately six weeks later than the Storm Water Manual. Ten Unit T- Hanger - No change. Air Conditioning Studies - We are continuing to prod Moore and Associates. the future we will efinitely not utilize this firm for air conditioning or ventilation work. Southwest Interceptor Re air - No work done on it to date; however, we have started a ing y rogen peroxide to the Hflwkeye Lift Station, therefore, odor has been eliminated. Mormon Trek Boulevard - Existing cross sections have been drawn and all the topographic •wor as been done, we are currently waiting word from the State concerning our concept statement. The State is not reading concept statements since they sre spending all their time on immenent construction plans. Monthly Report • Page 2 • Urban Renewal - A contract has been written for the Consultant which has been approved by Legal, Redevelopment, and yourself. Tennis Court Lighting Proiect - This project was awarded to Shay Electric and bidding documents are currently being prepared. FY78 Landfill Excavation Contract - Notice to bidders has been sent out. Asphalt Overlay Project - A list is being prepared on which streets should F; overlaid. This will be submitted to Council. City Park Pool Li Qhts - Shay Electric was awarded this informal contract to erect six poles and associated flood lights for City Park swimming pool. They will be starting this project in April. We have hired a new technician as a replacement for Al. Sanchez. We are currently advertising for the vacant engineering technician for inspection purposes. SOLID WASTE DIVISION The Solid Waste Division picked up 852 tons of solid waste during the month. Manhours per ton averaged 2.04. Volumes of solid waste are increasing dramatically as brush and yard clippings come out. Some overtime is being incurred and manhour s per ton is dropping into the 1.2-1.3 range. We are having difficulty keeping the Sanitary Landfill clean due to the high winds. The sludge that was hauled from the Sewage Plant to the Landfill is now, being spread and mixed in with the soil at the Landfill and seeding will be done in the next two to four weeks. POLLUTION CONTROL DIVISION The crews cleaned approximately 6500 feet of sanitary sewer. Approximately 143 manhours were spent working on lift stations. There were no complaints on sewer stoppages. A Maintenance Worker 11 position has been filled. A pump at the Pepperidge Lift Station failed. It was removed and parts were ordered. Repairs were completed at the west grit removal machine. The Iab technician attended a one day equipment seminar at Kirkwood Community College. The west pump at the Hawkeye Lift Station was rebuilt. The Department of Environmental Quality's approved our infiltration inflow study and it has been submitted to EPA for their approval. STREET DIVISION Craig Minter has assumed his responsibilities its Street Superintendent. As you remember Craig was the area superintendent for Kansas City, Missouri, and wuv in charge of approximately 500 aides of streets north of the river in Kansas City, Missouri. Monthly Report • • Page 3 Ile is thoroughly revamping the entire street maintenance procedures. After a week on the job he has completed an internal complaint form for use by Street Division personnel in recording citizens' complaints or writing down complaints themselves and then insuring that follow-up is made by the Street Division. A master work board has been posted at the Service Building so each crew will know its work assignment upon arrival at work. Craig expects to place major emphasis on crack sealing programs on concrete streets. lie believes that the $11,000 we budgeted for a double -jacket tar kettle will not be necessary and he would prefer to transfer these funds into buying a piggy -back oil distributor which cannot only be used for crack sealing but also for dust sealing streets. It is my intent to give him a very free reign to make changes over the next several months. As you know, I believe we were extremely fortunate to acquire Craig. CODE ENFORCEMENT 65 building permits were issued. Building permit for 902 and 904 North Dodge was reissued. Charges were filed against 132 North Dodge and charges have been refiled on the junk yard at 800 First Avenue. An injunction has been filed against the barbed wire fence at 222 East Benton. WATER DIVISION There were seven water main breaks during the month. 55 new meters were installed and 104 outside readers placed. Four employees attended the regional meeting of the American Waterworks Association at Muscatine. The valve at the intersection of College and Dubuque was replaced. The 500 -horse power electric motor at the main plant failed causing considerable damage to low lift motor and electric breakers. TRAFFIC ENGINEERING DTVISI ON The Traffic Engineer had the following meetings: e. Southgate Developers and IDOT concerning Sturgis Corner. b. Mort Ochenfel concerning Kirkwood 1ruck Question. c. 'University of Tows concerning Lindquist Center. d. Iowa -Illinois Gas and rlectric concerning Street Light Easements. e. Don Akin, Dawn Chapman concernstrg Nandicappee Pnrl.ing. f. Craig Sonksen concerning the University of Iowa O/D Survey on Melrose and Woolf. The Traffic Engineer worked with the part-time ntnt8'1) studto vvwaspcem},letean analysis approach to tisr north ide pa.ki.nr, Kirkwood 'Avenue for truck traffic. The 1976 Summary Collision Diagrams at 21 accident locations have been completed. The vuriable message signs for Gilbert at Bowery and Prentiss hove been ordered. A postcard survey was Monthly Report • • Page 4 initiated for Dewey and Yewell Street. Work continues on the East-West one-way couplet signalization. No work has been done on highway 6/1/218 resignalization. No progress has been made on Sycamore and Highway 6. Work continues on the Model Traffic Ordinance. I anticipate that we will be shipping some signalization programs planned for FY77 and 78 to Consultants. The Traffic Engineer continues to have his time completely absorbed by requests to have parking removed, requests for stop signs, speed signs, cross walks, street lights, and other miscellaneous requests. These requests are important; however, they are completely bringing to a halt all in-house work on major traffic signaliza- tion projects. The Traffic Engineering Division was called out on 34 defective traffic signals. 100 traffic signs were replaced and 31 street name signs were replaced. The signal at Rocky Shore and Highway 6 West was knocked down and replaced. EQUIPMENT DIVISION A bid was accepted on the street sweeper and it was awarded for a Wayne Four Model L12 Street Sweeper. A new high pressure washer has been received at the bus barn and will be installed shortly. One Maintenance Worker III resigned from the City and his position has been filled from in-house. One Maintenance Worker I transferred to Park Department and this position has been filled. The roof at the service building is leaking and the entire roof has bubbled. A roofing contractor has examined the roof and will give us an estimate shortly. The Consultant has completed drilling at the service building for soil testing and the results should be in within about two weeks. Finance Department is working with Public works on revamping the parts inventory system and a complete inventory w ill be done of all parts on April 20 . All stock transactions will be consolidated at the bus barn to eliminate the duplicate record keeping system at Finance and the Equipment Division. TRAN57T DIVISION Three new Flexible buses have been received and they meet specifications. The new Transit 'Manager has been hired. Mr. Mose comes from Pennsvlvania and has work experience in the University of Maryland Cambus system. A list of approximately 25 items will be given to the new manager when he gets here for investigation and implementation. These include minor route changes, more standardized work rules, etc. The system carried 138,000 passengers during the munch. Revenue was S«:,354. Nus N1 has been down ^2 days with rear end repairs. CAN PUBLIC -EMPLOYE UNIONS BE CONTROLLED? The unbridled power of government -worker unions continues to threaten vital community services. But citizens and elected officials are battling back BY KE10lVnr Y 7bNLINtaN F. UF. MARLEY, a 68 -year- old widow, watched UF as flames en- gulfed her home. Where were Kan- sas City's firemen? They had been on serike for four days, a period during which fires had occurred at inure [Iaan twice the normal rate fur this Missouri city. Many, like this one, were described by police as "well- pLaanned arson corru fitted by pcuplc kasowledgeable about fires.' a 61owl , methodically, four strwd bandits took pusses and wal- lets from too patrons in one of San Francisco's best-known restaurants, wins they were done, the wrapped Hasa 11S� worth of lone n a to Is. lath and walked casually out the from dour. Why burry%'Mun of San Francisco's policemen were on strike. Those officers who remained on the job did so under the most chaotic of condisiuns—police can were vandalized, tires slashed, igni- tion systems jammed and two-way radios dismcmberad. 9 Mountains of refuse covered the sidewalks of New York. The city'i sanitation men had walked oR the job, illegally, Leaving 5%000 tom of garbage rottirag in the hot July sun. Doliciate residents appealed to city leaders to use the National Guard. "If they call out tic Guard," onegarbagcman told the press, "we II blow up the trucks." spawned by [fie rapid growth of pp vernnicnt unions, such walkouts br public servaiTrs hnw nnrurwl 141 THE READER 5 DIGEST with alarming frequency in recent years. indeed, our country faces the very real prospect of public -employe unions literally dictating what gov ernment workers earn and, there- fore, the taxes citizens must pay. Since 1g6o, the number of state and local government employes has nearly doubled; Payrolls have more than quadrupled. Once considered underpaid, these employes generally have gained salary parity with the private sector, and in some cases spectacularly more. In New York, a municipal -subway token seller gets a base salary of 11a16 a week, while a bank teller starts at an average salary of 11145. In San Francisco, a beginning clerk -typist at city hall makes more than highly skilled sec- retaries working for major corporate executives. Traditionally, a government job— as a policeman, teacher, clerk, what. ever—carried with it a commitment to uphold the public trust; in fact, citizens voluntarily forfeited the right to strike when they became public servants. But the growth of public.employc unionism hupro- duced a new militancy in employe ranks. In 1974—the last year for which official figures are available— there were nearly 400 public. employyee suikes rcppreseming a loss of s.4 mill'san moan d� s. The Payoff. Despite the illegality of most public -employe nrikes, they have become a favorite bargaining tool—because they work. When peo- ple call's let to work because of a trannt nuke, there is cawncous pra- 4J APR sure on public officials to give in to bus drivers' demands. When work- ing mothers have to stay home be - awe teachers have closed down the schools, "political wisdom" often dictates a generous settlement—any- thing to end the strike. But that's not the whole story. The potential for collusion be- tween elected officials and politically potent employe -interest groups is one of the most troublesome aspects of the public -employe -union ques- tion. For more than two years, begin- ning in early 1973, the San Francisco Chroru'ck ran a series of exposis showing blatant manipulation of the city's crafts pay law. Waterworks employes, whose sole job was to adjust pipeline valves, were making up to $40,000 a year, end their retired colleagues were drawing as much as 522,3oo in annual pensions. City–hall plumbers were raking off salaries far above the private -sector wage, and Civil Service Commission officials were seeking to extend the pay -bo. nanzas to other city workers. Why was nothing done to stop this public rip-off? A clue an be found in the back -room alliances between union bosses and politicians in the early m97os. The presidene of the Civil Service Commission, sap - pointed by 'Mayor Joseph Alioto, 4napperrec'to be Vier President, of -^fir EPlunlberi union. The crafts -union heads were key financial backers of Aliotoi mayoral andlgubermtarial campaigns. In New York, municipal -union worker and thou families agarum 0 197 UN PUBLIC -EMPLOYE UNIONS BE CONTROLLED? for as many as 500,000 votes in a city where the average primary turnout is only goot000,. "There's no question about It t bouts Victor Ootbaum head of the city's largest municipal union. "Wc-have the ability to elect our own boss." Of course, municipal employes expect something in return. Two weeks before a crucial primary in 1975, Philadelphia Mayor Frank Rizzo handed 12,11 -percent raises to that city's civil servants. Rizzo'i fiscal irresponsibility brought Philadel- phia to the brink of bankruptcy the following year, but city employes applied thesrmuscle to his re-election campaign, and he won. The Bargaining Hoax. For years, leading opinion molders sold man- datory collective bargaining as die best mcism to avoid public -employe strikes. Now it is dear that just the opposite is the ase. "Compulsory collective 'bargaining causes an in. crease in -strikes and employe un- rest," concludes a recent study by the Public Service Research Council. In Pennsylvania, where the bargaining law has been cited as a model statute, yearly strikes entire than tripled in the four years following the law's enactment. The shady documents what many city of c"'have'camed rise "a" way.ln the i11 years following New York's decision to grant cxdu!ivc bargaining rights to municipal unions, secret labor negotiations saddled the dry with ata employt structurcn.sice as costly per citizen as in virtually every other city in the nation. Only after the city's recent fiscal crisis did taxpayers learn what had been bargained away. For every 13 the city spends on pay, It Is committed to $2 in fringe benefits. Under its 20 -year retirement plan, many city employes earn more as pen s.murs than when they worked. As the New York Trina pointed out, "New York is working for its union. ized civil servants, not vice versa." Today many of the "experts' who advocated compulsory collective bargaining to solve potential strife are touting binding arbitration as the only alternative to public -employe walkouts, Recent experiences, how- ever, document how this concept also erodes democratic government. In Alaska, community -college in. structors forced contract negotia. tions into binding arbitration. An outside arbitrator dictated a pay package at least $ s million more than officials believed the state could af. ford. Then he took the next plane to New York. "Tins is taxation without representation—the decisions on spending arc taken from the people's representatives,*' says Alaska Gover. nor Jay Hammond. Blueprint for Action. Unionized public employes arc not inevitably more powerful than the people they arc supposed to serve i here is hope that Americans arc ready to reverse the tide of public -union domination, and some of the best signs come from cities which have suffered most from undiecked labor- lir example: Sar hianarco. in 2975, voters overwhelmingly approved a charter NI THE READERS DIGEST April amendment effectively lowering pay equipment that was sabotaged, and for city crafts workers and requiring they battled arson4arrhed hlmcs— that striking police and firemen he one destroyed a lumberyard and fired. (Last fall, voters extended caused more then $500,000 in dam - mandatory firings to all city workers age. By the strike's end, however, it who strike.) A city plumber's base was not the city but the firemen pay was dropped from $24,000 to who had capitulated. While wages $20,500; '2 street sweeper's from were increased—less than demanded $17,300 to $14,700. Seventeen hun- —the firemen agreed to a sweeping dred crafts workers and another reorganization of the department 30oosympathizers promptly walked which increased each individual's of the job. But a majority of munici. workload and removed 27 super -vi - pal workers—including police and son from union control. And the • firemen threatened with the loss of city refused to withdraw major their jobs if they did not work— damage suits filed against the crossed picket lines. union. Citizens quickly realized that San Sedde. When Democratic Mayor Francisco could survive a major mu- Wes Uhlman eliminated some 500 nicipalstrike.Motoristscarpooled in needless city jobs, and then dis- unprecedented numbers, businesses for missed a fire chief who opposed hisdepartment's budg- organized transportation their effortstotrim affected employes, neighborhood et, the Firemen's union, backed by organizations spearheaded street other disgruntled employe groups, cleanups. Recalls Ann Fogelberg, a forced an election to recall the mayor cleanup organizer: "We wanted to from office. "Should the bureauera- shuw the labor bosses that we could cy control city government?' the do the job without them." After 39 maynrasked. The voters said no, and days, the crafts worken got the mes- he was returned to office by a new sage and west back to work. two -to -one majority. Kansar City. "When faced with Then workers at the city-owtxd militant union leaders, the public electrical utility walked off the job.. deserves militant elected officials," Por nearly too days, amid severe says Mayor Charles B. Wheeler, who storms and a terrorist bombing, the served as spokesman for the city city electrical system was kept in council during it four-day, illegal operation by afundfhdofsupervssary fire-fighters strike. He refused topersonnel. Today utility workers an nn's union negotiate with the fsrcx back on the job—and they have ;o while members wtrr off the job. minutesforlunehinnesdofthetwo. Meanwhile, hastily assembled fire hour break they had enjoyed before. crnvs. composed of yxliee, National Cltimi0ontral.lnaddition to dor Gusrdsnhrn and volunteers, fought leamu from (nese cities, there acre the city's fires. They worked with essential steps which local govern - 144 r9» GN PUBLIC-F.AU'LOYE UNIONS Bb' CONTRO1.l.F.D7 menus must be willing to take in avoid labor clams. Sunn• conuuuni sits may have to insplemrut manda- tory dismissals for public employes who strike. Other cities may need lesser penalties such as loss of scnior- ity or a reduction in retirement bene. fits for employes who' strike. But irrevocable penalties should be en- acted and made to stick. No community or arm of govern- ment should be without contingency plans to he implemented in case of strikes. Selected National Guard units in every state should undergo police and fire training. Supervisory Ihersonnci should be prepared to keep schools and the machinery of government going, using retirees or volunteers if necessary. Atlanta, Go., school officials found it much easier to negotiate with striking teachers when they discovered there were four qualified applicants for every teaching pose iu the city. The folly of baek-room accords is readily apparent. All bbovernment- union agreersaents should be arrived at ublidy, and taxpayers should be in of Prrsrta and future commitments. At the amt time, legitimate ernploye needs must be recognized and dealt with. Sound grievance procedures should offer workers avcnurs for complaints without having to turn to strike - happy union leaders. Most of all, city officials m ust talk frankly with their employes. When Cleveland Mayor Ralph Perk took office, he called some 3000 police and firemen to the city auditorium and explained that tire crushing budb'ct deficit he inherited necessi- tated that city workers take a [empo- mry ten -percent pay deferment. The ensuing years brought more fiscal woes and sonic employe layoffs; yet whenever action was taken, Perk faced employes to explain what was happening. Workers were by no means pleased, but labor unrest has been held to a minimum. A nationwide compulsory bar• gaining late is one of public labor's top priorities in the new Congress and, although that body is heavily weighted with union -sponsored rep. resentatives, citizens must create a ground swell of opposition ^eo such, proposals. When it comes to •respc n- si6ilih far sauntering tlw saifitarwv of pu6lic•employc unions, the price of citizen control is citizen concern. \� 40 Few people actually waste time; they just don't use it properly. But you can develop habits of priceless value Ten Tips _ to Help You Manage Your Time Canderued Irani "Giro oic Tiww C1 ow" MIST PFd:oup, wrEAESTEa in the if they dont, they don't return. Realizing that I was not one of I effective use of time when I was an assistant to a U.S. Senator. thos`wholuatltm°ownclife somcof apply Y Y Members of Congress are faced with demands on g. the techniques I had observed. Here urgent and rnnflicting work, are tell I havell - helpline mostme their time—for committee «I nd Boor votes, speeches. interviews. your day, Otherwise, ,you'll ;lhKate briefings. COffelplalldellef. investiga• c0 and your time according to whatever tions, es. rnu' prnblems, the need to Ix infrmed ml a wide Moult willwils llfindlyourself Makingoil your drik ^'Ile Yprimarily range of subjects. The more suc• develop tech. Yjuake (with cesful Congressmen hrm problems rfatherl titan opportu- 1 niques for griang maaimurn . from minimum investments o(time, by mile'- start each general schedule,,, with partilularam E..,, C. RIJY is a rNmilm l {MIW •d tewva.r Lauer nn n iio', nor quo- phanr on the two or threc nnapor things you would like m acconlpllish 1x.IMa1. _.... ... .. n.,. ...... ., ...n . a...',... fit{ ............... 12 TEN 7'11'.1' TO f it L YOU 111W.46P YOE' TIb11i ae top. I n host t,res, however, Glut. cr ',indcrs co'-ccltration and can Conic tension and frustration—a ,fealiag of.btingasnosvcd under." Whenever you find your desk be- coming chaotic, take time out to re- organize. Go through all your papers (ma king generous use of the waste- hasket) t)and divide them into cote- gcrics: 1) Immediate action.2) Low priority. 3) Pending. 4) Rc:•ding ma- terial. Put the highest priority item from your first pile in the renter of your desk. then put everything else out of sight. Remember, ,you can think of only one thing at 1 time. and you can work on only one task at it time -in focus all your attention otl the most important one. A final pnint- clearing the desk completely, or at least organizing it, each eve- ning should be standard practice. It gets the next day nff to a good start. Don't Be a Perfectionist. There is it difference between striving for excellence :,till striving for perfec- tion. The first is attainable, gratify- ing :old healthy. The second is often unattainable. Frustrating and neu- rotic. lt's also a terrible waste of time The stenographer who retypes it lengthy letter because of a -ovist error, or the boss who demands such retvping• might profit from namin- ing the Declaration of Independence. \sirhen the inscrilser of that document ....:u 1, hwo error, of nmissinn. he inserted the missing letters between e the ]lives. If this is acceptable in file r document that gave birth to Amen. r c.ol f1ccdnnl, fumll' it would he an•rlrah:r m .i letter 11111 will Ix —including things that will a; f icve lung -teen goals. Remember. stcsdics pnivc what common sense tells us: the more time the spend planning a project, the less total time is required fir it. Don't let today's busvxvnrk crowd planning -time out of Yoe - schedule. Concentrate. Of all the principles of time management, none is more basic than concentration. Penpie who.have serious time -management prohlcros invariably arc trying to du too many things at once- The amount Of time spent of n I,roieet is lint what counts: it's the nonmmt of fceinrrfrupted time. Fewpmh- Iems can resist 1n,11.nut attack; few can be solved piecemeal. Take Breaks. Ti, work for long periods without inking a break is nm an effective use of time. L- nergy decrcasrs,bnredomacnin,;hrd physi• col strrvs and tension accumulate. Switching for a few minutes from a u• uutal task to something physical— ieometric exercises, walking around the ullice. even changing from a sit- ting poutinn to a standing I•iosition lira whilr—can provide reed. fvierviv resting, however, is Often lite lest course, and you should lint Klink of O "ren" brenk as pnor Ilse m of time, Not only will Ixing re, frrshed incrcate your efficiencv, but teln•vhig tension will benefit )'nur lit-Ath. Anwiitog shat cnru•ihuict pro la•alth is good time manar-elwrm. Avoid Clutter, Sone petq•le has' a roasham swirl of papers .,n thei dr.p...ini dvwmr that sorno,ow rh �ol;.orrun Manor, W& lu.0 u fxh • u rGA' %•ll's TO lIHIJ' YOU SIANACh' YOUR TINE briefly glanced at en route to some- one's file cabinet or wastebasket Don't Be Afraid to Say No. Of all the time -saving techniques ever de- veloi•.ed, perhaps the most effective is frequent use of the word no. Learn to decline, tactfully but firmly, every request that does wt contribute to ,vourgoals. If you point out that your motisntion is not to get out of work but to save your time to do a better job on the really important things, you'll have a Rood chance of avoid- ing unproductive tasks. Remember, many people whn worry about of- fending others wind up living ac- cording to other peoples priorities. Don't Procrastinate. Procrastina- tion is usually n deeply ranted habit. But we can change our habits pro- vided we use the right system. Wil- liam James, the father of American psychology, discussed such i system in his famous Principles o/ Prvchol- ogy, published in x8go. It. works as (allows: 1) Decide to start changing as Anon ns you finish reading this arti. cle, while you are mrnicated.Taking that first step prongttly is important. 2) Don't try to do too mrch ton quickly. just force yourself right now [o do one thing you have been putting oR. Then, beginning tomor- row morning, -start each day by do- ing the most %opk-,Wtrt thing on your schedule. Often it will be a Amall matter: ml overdue apology; a confrontation with a fellow w•nrk- tr; an nnnoyiug dote you knov vnu Should tarkla Wkile,ri it i•. d" It hCrort you beim W,nl mo.0 ov.lo ing routine. Phis simple procadurc can well set the tone for your day. You will get a feeling of exhilaration from knowing thal although the clay is only hg minutes old, you have al- ready accomplished the most un- pleasant thing you have to do al l day. There is otic caution, however: Dn not permit any exceptions. William James compared it to rolling tip a ball of string; a single slip can undo more than many turns can wind up. lie tough with yourself, for the first few minutes of each day, for the next two weeks, and I Promise Van a new habit of priceless value. Apply Radical Surgery. 'rime. wasting activities are like cancers. Thry drain off vitality and hove :I tendency to grow. 7'he only cure is radical surgery. if you are wasting your time in activities that pore you, divert you Gram your real goals and say, your energy, cul them nut, once and lire all. The principle applies to percomd Whits. routines mid activities a% much aI In ones associated with vour work. Check youraplointnaent cal. endar, your extracurricular activities• your reading lin, vour television viewing bahus, lilt ax everything that dnesn•I give'Vail a feeling of air complishntenl m satisfaction. Delegate, An early example, of faihue to drlerane a fimnd all tit Bible. Moses, having ped his pergrle (lilt of Egypt, was to impressed wish los own knowledge and authcarity 111.11 he wslshed an ruling prrsnunlh sol rvr-\ IUI111p V1^\1' th.11 arl\u' o, la dt'l. i L, \v a' lalllt'I III•Id N', Ielluo. las THAI rills To HELP YOU AMNXrE YOUR TIME recugnixing that this was poor use of a leader's time, recommended a two-phase approach: first, educate the people concerning the laws; second• select capable leaders and give them full authority over routine matters, freeing Moses to concen- trate on major decisions. The advice Is still sound. 14111 don't have to be a national leader ora corporate executive to delegate, either. Parents who don't dch•ga is household chores are doing a disservice to themselves and their children. Running a Boy Scout troop c.uh he as time-consuming as running General Motors if you try to do ev- erything yourself. One caution: giv- ng sulordinates jabs that neither you nor anyone else wants to do isn't delegating, it's assigning. Learn In dcicgaue the challenging and re- warding tasks, along with sufficient authority to make necessary deei. sirens. It ran help to free your time. Don't Be it "Wurkabolic:" Most successful executives I know work lung hours, but they rlun't let work Illterlere with the rcalh inspartaot Ilungs it, life• such as friends, ftrnily and fly fishing. 'fin differentiates them from the workaholic who Iw- cumcs addicted In work just as Inople become addicted to alcohol. Symptoms of work addiction iq- elude refusal to take a vacation, in. ability to put the otice out of your mind on weekends, a bulging brief. case, and a wife, son or daughter who is practically a stranger. Counsding can help people cope With such P. oblems. But for starters, don bit of sclf•counseling. Ask your. self whether the midnight oil you are burning is adversely affecting your health. Ask where your family conies in your list of prioritic syhcthcr you arc giving enoIs ugh o yourself to your children and spouse, and whether you are deceiving your. self by pretending that the sacrifices you are making are really for them. AIIIWE ALL ELSE, good time manage. nhrut involves an awareness that to. clay is all we ever have to work with., 'I'hc past is irretrievably gone, the Allure is only a concept. British art critic John Ruskin had the word "'I WAY-- carved into a small marble block that he kept oil his desk as a constant reminder to "Do It Now." Nut my favorite quotation is by an anonymous philosopher: Yesterday is a canceled check. 'lbmorrow is a promissory note. Today is ready ash. Use it • Y of Iowa Cite MEMORANDUM DATE: April 15, 1977 TO: Neal 'Berlin and City Council n FROM: Dick Plastino, Director of Public Works // RE: Ralston Creek Watershed Report /-!/ Attached is a report on existing conditions in the Ralston Creek Watershed. This report is one segment of the Ralston Creek Watershed Management Plan. A final report outlining suggested solution to Ralston Creek flooding is expected midsummer. �`i�Fwi}Rt`ca i1AaRYlIN'I�hAN�i� f .� ; e;.. SII . 0 y M u rI a � _ _._. � Y wiy :%Mer• 1 �.�... - • ..: .. .. dl}M 'r IYywIF Nf ��91!/'1hk/.i r 1 1 POWERS & ASSOCIATES ENGINEERS • ARCHITECTS' PLANNERS 325 EAST WASHINGTON STREET • IOWA CITY, IOWA 522aO LINDLEY & SONS,INC. 10 N. Lincoln St.. Hinsdale, Illinois 60521 • Phone (312) FA 5-0886 Marco 21, 1977 Mr. Richard Plastino, P.E. Director of Public Works Civic Center Iowa City, IA 52240 Dear Mr. Plastino: We are pleased to submit this report dealing with existing conditions, problems and needs relating to flood damage in the Ralston creek watershed. This phase of the study does not contain recommended solut inns to the problems which have been identified, but does present an analysis of existing conditions and their relationship to the concept of storm water storage as a means of alleviating flood damage. Plans and recommender- ions for minimising flood damge will be Presented in a forth- coming report. Sincerely, lames w. Powers, President Powers 6 Associates K. P.L. Y /dlc TABLE i DIRECTION PAGE Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Goals and Objectives . . . . . . . . . . . . . . . . . . . . . . . . 1 Related Policies . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SOCIAL CONCE1`VS History of Flood Damage . . . . . . . . . . . . . . . . . . . . . . 3 ExistingLana Use . . . . . . . . . . . . . . . . . . . . . . . . . 4 Impact of Ralston Creek n 'roperty Values . . . . . . . . . . . . . 11 Housing and Population Characteristics . . . . . . . . . . . . . . . 13 Aesthetic Values and Social costs . . . . . . . . . . . . . . . . . 14 Recreational Use o: SLcc._m dater Storage Areas . . . . . . . . . . . 16 Transportat�-�n and Safe . . . . . . . . . . . . . . . . . . . . . 18 CHANNEL AND F_ICi),- =i.4 i': D' AILS Channel and F]Dod F', -,1n :,ta . . . . . . . . . . . . . . . . . . 23 DRAINAGE S'i ST=':-` Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Existing Records . . . . . . . . . . . . . . . . . . . . . . . . . . 35 Runoff. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Transport. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37 Storage.. 42 Sanitary Seca<•r Surcharge . . . . . . . . . . . . . . . . . . . . . . 43 NATURAL AND PHYSICAL FEATURES Geology and soil& . . . . . . . . . . . . . . . . . . . . . . . . . 49 Erosiun and . . . . . . . . . . . . . . . . . . . . . . 49 Assessment of Wildlife and wildlife Habitat 50 LEGAL. ADMINISTRA'1'1%1 AND I'1NANCIAL Legal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . rc Governmental Subdivihiuns . . . . . . . . . 56 Administrativc (Local Agencdas. 57 Adm finstrativ•. lSlat.v and !'ederal Agemi-�s) '.i'! FIGURES Flood Water Profiles . . . . . . . . . . . . . _ . . . . . . . . . 39 Flood Plain and Floodway Comparisons . . . . . . . . . . . . . . . 40 TABLES 1962 Flood Damage Estimates . . . . . . . . . . . . . . . . . . . . 3 Comparison of Property Values . . . . . . . . . . . . . . . . . . . 12 Housing and Population Characteristics 13 Potentia] Srorm Water 5'3.tes. 44 �I 11 FJ u :II MAPS PAGE Existing Land Use . . . . . . . . . . . . . . . . . . . . . . . . . 5 Land Use by Ownership . . . . . . . . . . . . . . . . . . . . . . . 7 Agricultural Land Use . . . . . . . . . . . . . . . . . . . . . . . 9 Street Flooding . . . . . . . . . . . . . . . . . . . . . . . . . . 19 .� Ralston Creek Channel 6 Floodway Features . . . . . . . . . . . . . 24 U.S. Highway 6 to Rock Island Railroad . . . . . . . . . . . . . . 25 ' `{ Rock Island Railroad to Washington Street . . . . . . . . . . . . . 26 Washington Street to Clapp Street. 27 Confluence to Hickory Hill Park . . . . . . . . . . . . . . . . . . 28 Glendale Court to Sheridan Avenue . . . . . . . . . . . . . . . . . 29 . Sheridan Avenue to F Street . . . . . . . . . . . . . . . . . . . . 30 F Street to Memory Gardens Cemetery. . . . . . _ . . . . . . . . . 31 J Memory Gardens to Brookside Drive . . . . . . . . . . . . . . . . . 32 Brookside Drive to Scott Boulevard _ 33 Subwatevsheds and Major Storm Sewers . . . . . _ . . . . . . . . . 36 Potential Stone Water Storage Sites. . . . . . _ . . . . . . . . . 45 Flood Plain & Sewer Surcharge Area _ 47 Terrestrial & Aquatic Study Areas. _ 51 FIGURES Flood Water Profiles . . . . . . . . . . . . . _ . . . . . . . . . 39 Flood Plain and Floodway Comparisons . . . . . . . . . . . . . . . 40 TABLES 1962 Flood Damage Estimates . . . . . . . . . . . . . . . . . . . . 3 Comparison of Property Values . . . . . . . . . . . . . . . . . . . 12 Housing and Population Characteristics 13 Potentia] Srorm Water 5'3.tes. 44 �I 11 FJ FC j In March of 1976, a report dealing With "interim solutions" to the Ralston Creek flooding problem was prepared and he city. The report contained recommended presented to t solutions which could be implemented in a relatively short period of time while the problems and needs of the ' watershed could be more thoroughly analyzed and additional solutions studied. .. The amount of existing data available on the Ralston Creek watershed and related -flooding problems is voluminous. n The problems have L,en studied by Federal, State, County, Municipal and private agencies as well as a number of individuals and a variety of solutions have been recommended -� to reduce flood damage. i Past recommendations have covered many aspects of flood control, including permanent pool storage, diversion ..� channels, channel widening, removal of structures from the ..P flood plain, enlargement of storm sewers, and many others. n r It is readily apparent that no single solution or method within financial reason has yet been developed for A. alleviating flood damage. This study has been initialed on the premise that there is no single solution to the flooding problem, but that a �+ combination of many methods must be used. Thus, the concept r. of storm water management through the use of detention ,n facilities, together with various ne1)^s1rL3Cturh] solutions it for reducing flood damage is being developed for the Ralston Creek watershed. r.. r. solutions contained in the interim report included the Storm Water Management Ordinance, together with a number of channel improvements and development of smaller storm water storage sites. The ordinance has been adopted and is being implemented and construction drawings are in progress for various other projects which were recommended. This report contains an analysis of existing conditions, problems and needs relating to flooding and flood damages in the Ralston Creek watershed. In addition to this report, an "Assessment of Wildlife and Wildlife Habitat in the Ralston Creek Watershed" was submitted to the city in January of this year. Information contained in these reports will provide the framework for developing plans and recommendations to be contained in the final Watershed Management Plan, which is scheduled for completion by mid- year. Unless preventive measures are taken, flooding problems along Ralston Creek will continue to compound as remaining portions of the watershed are developed for urban use. Increases in storm water runoff and increases in the rate at which storm water runoff occurs as a result of additional development in future years will, if unchecked, set the stage for more severe floodinq problems along Ralston Creek. In addition to contributing to flood problems, there is also the possible threat of litigdtiun facing land developers in the upper teaches e f the wetcrshed where additional development would contribute to an 1�wrr nnr*)oris of alreaay sevcue :iuuc.:,q i -..%f" the crep.k. r:: 'law Y i•r� w���'. u w 4n .f 1` '{�-_'�r.Z �I��Y: �b . i K^:y �S f �� f •�f i M � y i a x _ � ' r R wyrt • i'. ram j Direction RALSTON CREEK WATERSHED AN INVENTORY AND ANALYSIS OF EXISTING CONDITIONS, PROBLEMS AND NEEDS INTRODUCTION The problem of flooding along Ralston Creek is old and is the result of urban development encroaching on the flood plain. The Ralston Creek Watershed has been Iowa City's most rapidly developing area over the past two decades. New residential areas such as Court Hill, Bel Air, Washington Park, Oakwoods and Windsor Heights have both increased and accelerated the storm water runoff rate. As runoff passes through previously developed areas such as Morningside Addition, the Longfellow area, the Washington Street area, and the South Gilbert Street area, it encounters limited channel capacity due to obstructions by past development and street crossings. It appears as if there has been an increase in the magnitude and frequency of flooding. The City and especially the citizens residing in close proxi- mity to the channel are well aware of the problems. There have been studies documented by a number of sources including the Corps of Engineers, Soil Conservation Service, and Iowa Natural Resources Council. The basic decision has been made by the City of Iowa City to develop a Ralston Creek Watershed management Plan, the philo- sophy and concept of which will determine its success. A program that is realistic, effective, economical, and achieveable is being developed by the City and portions of the program are already being implemented. It is based on the premise that no one single solution is available, but that a total watershed management plan is a combination of structural and non-structural measures in the proportions determined to be most effective, benef i.Cial, and feasible. The initial phase of the study, presented in a report dealing with "interim snJutions," hrs provided thr bnsis fnr drvelnp- ing and implementing several immediate solutions, the most significant being the preparation and adoption of the Storm Water Mo nduement Ordinance. Several small ^4anne] imi�rovements and storm water storage sites were also selected for con- structio a in 1976 - 1977. GOALS AND OBJECTIVES The goal of the Ralston Creek Watershed Management Plan is to reduce damage caused by flood waters. Some of the objectives necessary to realize the goa 1 include: A. Control storm water runoff. B. Protect the flood plain from further encroachment. C. Encourage the conservation of natural resources. D. Develop solutions that are compatible with the environmen t. E. Identify the beneficiaries of alternative solutions. F. Evaluate the monetary, social and environmental effectiveness of alternative solutions. G. Determine sources of funding and services for con- struction, operation, maintenance and administration of projects or programs. H. Organize and coordinate efforts of funding sources with the appropriate authority to follow through with the projects and programs. RELATED POLICIES To guide the planning, design and development of storm water management programs, certain policy statements aimed at accomplishing the objectives outlined above, should be adopted. A. Design of flood control and drainage facilities should be in conformance with a comprehensit,e plan. B. Because f i ood control is a space allocation problem, the temporary storage of excess storm water near its origin should hr enev+urr+ged. C. Project planning should take into consideration the <Ffec's o^ adjacent and downstream land and water uses. As the urbanized area expands, projects that simply transfer flood problems will become less desirable since they tend to perpetuate and multiply problems rather than solve tient. a , ��r i.�'. �`. -.. a� � �.1 � ,., ,.r"w� t ...... �.. s G. Natural or manmade obstructions in stream channels inhibit the flow of st ormwater and aggravate flood- ing. A continuous program is needed to prevent obstructions and to retain adjacent channel capacities compatible with an acceptable discharge capacity. H. Combinations of flood damage reduction methods should be used, including detention basins, flood plain zoning, land use controls, flood forecasting, and structural floodproofing. I. Public agencies should be encouraged to acquire by P, gift or purchase, key areas adjacent to streams for IJ maintenance of flood drainage, and compatible uses. J. Adequate flood control funding must be provided if an effective program t o reduce flood damaqe is to be achieved. K. An organization of the City government should be responsible for operation and maintenance of tho storm water drainage systems. L. All local aovernments dnd Fedcral agcncics shrwld LO encouraged to support projects for soil eroslun crod sediment control from agricultur�ll land. 1 I 1 a 1 D. Flood control measures should, insofar as possible, serve other purposes as well, including recreation, wildlife conservation, open space, and improvement of stream flows. E. Flood plains must be protected from encroachment not only to provide for the storage and passage of storm waters, but to prevent damage to adjacent development which would otherwise occur. —, F. Drainage problems are worsened by deficiencies in storm sewers and manmade channel systems. These deficiencies should be eliminated or minimized. G. Natural or manmade obstructions in stream channels inhibit the flow of st ormwater and aggravate flood- ing. A continuous program is needed to prevent obstructions and to retain adjacent channel capacities compatible with an acceptable discharge capacity. H. Combinations of flood damage reduction methods should be used, including detention basins, flood plain zoning, land use controls, flood forecasting, and structural floodproofing. I. Public agencies should be encouraged to acquire by P, gift or purchase, key areas adjacent to streams for IJ maintenance of flood drainage, and compatible uses. J. Adequate flood control funding must be provided if an effective program t o reduce flood damaqe is to be achieved. K. An organization of the City government should be responsible for operation and maintenance of tho storm water drainage systems. L. All local aovernments dnd Fedcral agcncics shrwld LO encouraged to support projects for soil eroslun crod sediment control from agricultur�ll land. 1 I Social Concerns fli 1962 1977 HISTORY OF FLOOD DAMAGE t1977 INTRODUCTION Flooding from Ralston Creek has caused extensive damage in Iowa City in eight major floods during the 40 year 1 period from 1932 to 1972. Two floods of approximately 17 -year recurrence intervals occurred in July, 1962 and July, 1972, and produced flow rates which caused considerable damage. Following the 1962 flood, the to present day value. Army Corps of Engineers inventoried flood damage for :It is important to recognize that flood damages, while use in future watershed planning studies. The inven- affecting only a few Iowa City residents directly, tory by the Corps included interviews with residents also have an effect on the total population of the as well as commercial property owners. Damage estimates City through inconveniences and interruption of ser- in monetary terms were developed and are presented in vices as well as the cost of clean-up and repair to the following table. fli 1962 1977 The 1962 dollar amounts have been adjusted to reflect t1977 values as shown on the accompanying table. The estimates are of particular significance because they represent the only thorough analysis of flood damage 1 prepared by experienced and objective personnel. A local survey conducted after the 1972 flood estimated damages as $350,000 or approximately $485,000 adjusted to present day value. :It is important to recognize that flood damages, while affecting only a few Iowa City residents directly, also have an effect on the total population of the City through inconveniences and interruption of ser- vices as well as the cost of clean-up and repair to r public facilities in the flood prone areas. As flood magnitude and frequency continue to increase, tax supported repair and clean-up costs will also increase �w accordingly. fli 1962 1977 1962 FLOOD DAMAGE ESTIMATES BY U.S. ARMY CORPS OF ENGINEERS EMERGENCY WORK DIRECT EXCAVATION & OTHER NO. OF DWELLINGS WITH NUMBER OF PHYSICAL REHABILITATION INDIRECT DWELLINGS THE FIRST FLOOR PERSONS AREA DAMAGE COSTS DAMAGES AFFECTED FLOODED EVACUATED main stem below junction with N. & S. branches $ 68,600 North branch 8,600 South branch 57,600 Commercial and Public Areas 139,400 TOTAL $274,200 *1977 $526,000 '. 1962 GRAND TOTAL EXCEEDS $300,000 1977 GRAND TDTAL EXCEEDS $625,000 $ 8,100 $ 100 160 6 16 1,000 - 32 _ - 8,300 700 216 6 16 14,300 19,100 36 - $31,700 $19,900 444 12 32 $60,800 $38,175 *1962 values adjusted to 1977. By multiplying the 1976 Price index by 1967 dollar value (base year) and dividing it by the 1962 price index, increase from 1962 to 1977 is obtained. Source for value adjustment: Consumer Price Index - Monthly Labor Review, Jan. 1977 3 EXISTING LAND USE EXISTING CONDITIONS AND PAST TRENDS Ralston Creek has not been a major influence in shaping the community's land use pattern in the past. Instead, Ralston Creek has been shaped, graded, altered and relocated in many places to accommodate urban development. Accurate boundaries of flood prone areas were not fully defined in many parts of the water shed in the past and the potential threat of flood was obviously overlooked or dis- regarded in many instances. An increasing demand for useable land within the urbanized area of the City, together with the lack of adequate controls, has permitted subsequent urbanization of large portions of the watershed. This has contributed substantially to the amount and rate of storm water runoff, resulting in even greater flooding potential. This trend has not completely dim: nished, however, the City is exercising better control over development on the flood plain at present than in years past. Existing land use in and along the flood plain can be categorized into three general types, which are: 1. open space 2. Single family residential multi -family and commercial The land use for urban portions of the watershed is discussed on the following pages and is shown on the accompanying map. URBAN LAND USE LOWER REACHES OF RALSTON CREEK. In the area south of the Central Nusiness District, land use has been changing from single family residential to a mixture of retail and whole- sale commercial uses. Housinq along the lower reaches of the creek consists primarily of older, smaller single- family structures, many of which are in a deteriorated state. A number of these structures have been subjected to flooding and as a result, their improvemuit or replacement 2%as Leen: d:sc raged. L recent years houses have been replaced by commercial structures, a number of which have apartments on the second floor. Because of the demand for small parcels of light industrial and commercial land, a number of properties in this vicinity cannot economically be redeveloped for single family use. Most building sites are better suited for commercial use than for residential. Warehouses and some other types of commercial buildings would incur relatively little damage in the event of flood as contrasted with dwellings. The proximity of recent development to the Creek and flood prone areas has not changed appreciably, except greater consideration is now being given to elevations and encroach- ment on the f loodway than in the past. A description of land use characteristics of several specific areas along the lower reaches of Ralston Creek is presented on the following pages. Iowa River to Kirkwood Avenue. From Kirkwood Avenue To the mouth of Ralston Creek, the channel and adjacent overbank areas have sufficient capacity to accommodate storm flows. As a result, flooding does not signifi- cantly affect adjacent land use in this area. Kirkwood Avenue to Rock Island Railroad Bric e. Signifi- cant land use changes are occurring in this vicinity and many are the result of the reconstruction of Gilbert Street. Many properties on the east side of Gilbert Street are now better protected from flood waters than in the past and also enjoy improved access to the Central Business District. This general area is attractive to various types of commercial uses as well as multi -family dwellings because existing streets and utilities are available. At several locations between the railroad bridge and Benton Street, land on the west side of the Creek is lower than on the east side. Flood water spills over the west bank and seeks its own course, which does riot parallel the creek channel, flowing southwesterly to Lafayette Street, then westerly along Renton to Dubuque, and southwesterly across the parking lot at the National Guard Armory before crossing Kirkwood Avenue and re- entering t3ie creek channel. Because of the susceptibility of flooding, redevelopment to improved commercial and multi -family use would accelerate if the flood hazard could be minimized. M J4 pu.wk2w�-. wp•• P IL IEXISTING LAND USE Y RALSTON CREEK B IOD YEAR FLOOD PLAIN Q SINGLE FAMILY RESIOEN71AL •WO FAMILY RESIDFNTIAL Q MULTI— FAMILY RESIOEN71AL COMMERCIAL INDUSTRIAL �pp PUBLIC B SEMI. -PUBLIC a>•1 VACANT 0 P"I'116 WILL16 6 ASBD(Wrip /- !I l iOMJ N ', L W01f, aNN,. r r n�410L:1. ;0.. � Current trends indicate that vacant sites on the flood plain in this area are being developed. This in turn causes encroachment on the channel and/or flood way resulting in more flooding on existing properties. Railroad Bridge to Burlington Street. In the block immediately north of the railroad bridge there is a significant amount of vacant land on either side of the creek which coi.11d be developed if the creek could be contained within the channel and adjacent fl oodway. Some existing commercial uses in the vicinity could be floodproofed with relative ease. Similarly, the vacant areas along the creek between Gilbert and Burlington Streets could be developed with little difficulty if the expanse of the flood plain could be control led without adverse effects on upstream areas. Major land use changes in this area include the recent abandonment of several railroad spurs and movement of industrial and commercial uses from the area. An apartment building is presently under construction on Linn Street. Burlin onto Washington Street, In this area, Ralston Cree is on City property and passes the Recreation Center and the municipal parking lot. The parking lot is subject to inundation, however, land uses in this vicinity are not expected to change. In this general area many uses on the flood plain are commercial in nature together with numerous accessory uses such as parking lots and loading and storage yards. Land use along Ralston Creek in this vicinity has undergone minor changes in recent years and will likely continue to experience some additional changes in the future. while many of these changes did not occur as a direct result of potential flooding, the proximity of structures to the reek, chances in elevation, encroach- ment and floodproofing measures will be taken into zccount when future development is prepared. washing_ton Street t-0 the Junction of North and South Branches of Ralston Creek. The east edge of the Cential Business Urstrict is a transitional area where commercial and ci! is uses joi- ar area cf predoreinar.tly rcz �dr,rt�l uses. Because of the proximity of this area to the Central Business District and to the University, there is a ctrona demand fnr multin]F family dwellings, and it is anticipated that the trend from single family to multiple family dwellings will continue. Because of the topography north of Ralston Creek between Van Buren and Governor Streets, caution should be exercised in the construction of basement apartments and storage of valuables at locations susceptible to flood. NORTH BRANCH. A short distance northeast of the juncture of the North and South Branches of Ralston Creek, land uses are predominantly single family residential with nearly all areas developed. In the past, some consideration was given to the flood prone areas and few dwellings were constructed adjacent to the creek without adequate fill. One low area was given to the City for open space instead of developed housing. Due to the general condition and character of this area (between Jefferson Street and Rochester Avenue) no change in land use is anticipated in the future. Further- more, the flood plain in this area becomes very narrow because of the rolling topography. North of Rochester Avenue land use along the North Branch consists largely of open space including Hickory Hill Park and portions of Regina High School property. Limited development in recent years includes residential areas west of the park and immediately west of Regina High School. This location does, however, have the potential for addi— tional recreation use and could serve as a major storm water storage site. SOUTH BRANCH College Street to the Railroad to Muscatine and First Avenue. Near the confluence of the North and South Branches, land uses consist of residential development, however there are some large wooded parcels in this vicinity which could be developed if flood protection were provided. South of College Street nearly every parcel of land along this segment of the South Branch is ieveloped. Most development in this area, some cf whi ch is located ir. a broad flood plain, consists of single family dwellings with some 2 family units interspersed. Because of the general nature of development in this part of the City, there has Leen little or no changc- to the overall land use pattern of the area. First P.vc:_aue. Tuerr Lis acct, ..o1.e_re::al:.e L�.idlrig activit_y in this area in recent years with a number of small structures (mostly commercial) being constructed. itecause of an eipparent demend fnr vh t -i r,u5 type -s of ncigLhc,rhood n(-rvic-n fmmTTu•rcial in this vicinity, it is l:ipv..'..(:.'. t).(!t (.C7. * * .(o ff r"r 1:: ! . 11lIL* ; I pII 11 f:i 11 rr vacarit parcels are developed. I: I. I I i IS I re I JIJ �l I■ h' I I t l I LAND USE BY OWNERSHIP f... PUBLIC 4 i SEMI-PUBLIC 1..� � �II �. �rM I ( - Yu4n wm :41.up uurtnm of IUYY t' Y ( - GUJMCI IUw{ (II. Of.l p CJYYnGi11 pr(�UMY 141 PMENS - WILLI6 r ASWC4(re INC k East of First Avenue. Beyond the cluster of commercial development, land uses are predominantly single family residential with some areas of open space along the flood plain. Development is relatively new and no change is anticipated in land use along the North Side. There is some vacant land in the flood plain along the north edge of the mobile home park and cemetery. Fill material has been placed along the Creek to permit additional development of the mobile home park, resulting in the loss of floodway area. In the vicinity of Friendship and Brookside, recognition of flooding on Ralston Creek and its tributaries has resulted in the development of some park and open space areas that might not otherwise have occurred. Develop- ment in other areas of the watershed outside the flood plain and particularly that area bounded by Friendship Avenue on the south, Seventh Avenue on the west, Rochester Avenue on the north and extending eastward to within two to three blocks of Scott Boulevard has, for the most part, been developed for single family residential use. There are some small areas which have been developed for multiple family use, schools, churches, cemeteries and other public and semi-public uses. PUBLIC d PRIVATE OWNERSHIP PATTERNS In the Ralston Creek watershed, a substantial amount of land is under public and semi-public ownership. Much of the land under the jurisdiction of the University of Iowa is located west of the Central Business District near the edge of the watershed, however, little if any is located on the Ralston Creek flood plain, One of the largest tracts of land in public ownership is Hickory Hill Park, with the City High School site, athletic field and Hoover School sites combining to make the next largest tract of publicly owned land. Various other school sites and !aria arc located throughout Ihr wattrehed card are shown on the accompanying map. There is a large concentration of public and semi-public lands in t.iit nQitl.err, port ()f the water ahe�i w!,:rf. incl dt Oakland and St. Joseph Cemeteries, Hickory Hill Park and the Regina School site. Other public and semi-public areas in the etetcrn ;. _ �' •h4. ,,,,e.t•rshe r .chr, churches, parks and such uses normally found in residential areas. :7 � 5 ;4 x It is of particular importance to recognize that many areas in public and semi-public ownership are situated n P at key locations or have physical characteristics which make lJ s�}s .them:conducive'to storm water storage. ,a n. n RURAL LAND USE Lit The present.limits of urban development in the RaLston Ir1� Creek watershed are approximately Scott Boulevard ontheu Feast and: RochesterAvenue on the north. Slightly more than a+ onelhalf or.approximately two and one half square miles, of the undeveloped portions of the watershed are outside the Iowa' City. corporate:.limits and are subject to the Johnson County.zoning regulations. Land use in this area is shown on the accompanying map. Land use,:in the.rural,portion of the watershed has been .categorized as rural residential, grasslands, woodlands and n row...crops. Major'changes'that have occurred in the past L`t s, include,the conversion'of wooded areas and grasslands to �{F`, agricultural,use'and-particularly-to,row::crop farming.. Because' the steep topography of the remaining woodlands D, and :grasslands;:;' little or no, conversion to row crop is 'Y' Y anticipated In the; event such areas are placed under " cultivation,,'extensive soil conservation measures should be 0 �. implemented ,. ,. t Of the areas in agricultural use, soil conservation projects consisting of,tile-terracing have been implemented on only ;althoughsconservation plana have been'prepared,for ,.acres t r ;more .than 4G- additional- acres. Because of the Tong range n commitment (20'years),land' owners must make -to receive! a' Federal.::assistance for.,tile-terracing:,and other permanent k +, cost -shared conservation programs,"it is unlikely: that k' ad ditional'projects',will be undertaken within those areas d „Y, wh�.ch,could'conceivably be• developed' for urban use within f4 a A. 55. . trl the'next,,.20-25.years.� As a'result'Iowa City can expect only 1 the,more.distant and remote. areas of the watershed to be :a „yF ; considered for permanent soil conservation programs such as Othery forms ofs oil conservation, such as no -till or contour kwAr i;farming,' and' debris and -sediment control basins, should be :. "r" �`"'considered where a'short-term commitment is desired or where N ithd`expense of",tile-terracing or other conservation practices Jy Jare not practical.', r y ppWL1r of ll.p Mfll r - Al AGRICULTURAL 7, N-Mr LAND USE :A, RURAL RESIDENTIAL WOODLANDS 1,7 GRASSLANDS ROW CROPS 0 j CONSERVATION PLAN PREPARED CONSERVATION PLAN IMPLEMENTED MM 4 Olt tIA LIMITS' OF URBAN DEVELOPMENT -'J POWERS - WILLI$ .5 ASSOCIATES IOWA CITY, IOWA AND LINDLEY a SONS INC. HINSDALE, ILLINOIS -.L IV/ } 1 Ci►WdIjul ail ;R F� L � ' e��• W. \❑(�:'{ /♦ 1�1 At17 � ,�1�I�W� r •. �� 8 r1 t4rwh Y[A. 41 .«,�.,.• Ate,., 77 v K114 JMMARY'AND CONCLUSIONS and'use changes are occurring most rapidly in the lower ?a'ches':o£,Ralsto'n Creek,: in: the, vicinity of Kirkwood ✓enue;:-Benton Street,s,Gilbert and'Van Buren Streets, where lder-,single;;family`'dwellings are :being `replaced. by yil mmercial,and;light,_industrial:.uses. This change in land . e cannot:be',`attributed'wholly.to;the'flooding problems:': Rural residential development'has been occurring at x5 =i scattered locations throughout this portion of the water - ater- extent'of urbanization and the type of development extent of ,expected: in futureyears' will be dependent upon the availability, of,municipal 'utilities, annexation of potential growth'; areas,'-and;the effectiveness of municipal and County land'use policies, in regulating the expansion of urban areas.: At -the --present time, urban development on Iowa City's east side<hastreached Scott Boulevard 'and 'it is expected that ; ys ':'.development will continue in this vicinity in the near future. Because the South Branch of Ralston Creek passes through this` area, it is imperative that steps be taken to accommodate the need for storm water storage as well as promoting the, most'`appropriate use of land. JMMARY'AND CONCLUSIONS and'use changes are occurring most rapidly in the lower ?a'ches':o£,Ralsto'n Creek,: in: the, vicinity of Kirkwood ✓enue;:-Benton Street,s,Gilbert and'Van Buren Streets, where lder-,single;;family`'dwellings are :being `replaced. by mmercial,and;light,_industrial:.uses. This change in land . e cannot:be',`attributed'wholly.to;the'flooding problems:': eatedi by;,Ralston'"+Creek,'; but i'' irtially a' result of , icie`ised�'demand for' commercial and industrial properties locations'having.good access and close to the center of . ie,,City ie second major area,,where land use changes are occurring on;'the,'eastern:'fringe of:existing urban development rerd;the con version,of;raw;',land to'residential and other: `ban"use' is"aaking,`place. ' ` Lny,undevelop'ed areas are well, suited for;, storm water ; .orage, however, timely, action. on, the part' of the City necessary. to "their: future availability. ie';feasibility of providing major: storm water storage cilities is. :far more; practical if,it can be incorporated 'th'e oto 'design'. of, an area before development takes place. croachment upon,the flood plain by urban development and duction of3 channel' capacity through the.; placement of fill terial on" the Creek. banks. has o-,curred>in much of the'`-. ., baniiid'ar ',along` Ralston Creek and its tributaries. and:enforcement e:adop 'of the!. flood -plain zoning dinance will''help'provide a measure, of, control for future velopment.• ' X Soil conservation practices should be encouraged in the outlying portions of the watershed which generate runoff but which will not be needed for urban development. Rundell Street Area IMPACT OF RALSTON CREEK ON PROPERTY VALUES INTRODUC•ION The effect Ralston Creek has on adjoining property values, differs considerably from one area to another. As a'result of'.the "flood insurance program which has recently provided the accurate delineation of flood prone areas along Ralston Creek,:realtors, appraisers, assessors, and other concerned' :withdetermining the valuations of properties now have the benefit of a current map showing flood prone areas.These areas, undoubtedly vary from what many individuals believed were susceptible to flooding over the past years. In some P!.,..,. instances; the flood insurance maps will show areas whichare susceptible-to flooding that were previously believed to be< ee' from'.flood, in other areas certain properties ,while; that';are'within close proximity to Ralston Creek or its `I 'tributaries are `shown by the survey to be free from flood threat ' The final''location of flood prone 'areas as delineated by h the*U S.'Survey. for Ralston Creek, including. both ;Geological the�nortl ;.,and south' branches, was not available �in:1975 when the'most'recentproperty re-evaluation of the City was t undertaken :.Thus, the present valuation figures will not b necessarily, reflect the specific' boundaries of the flood �,T,, K,>, ,,a•-�", prone, areas' delineated by the U.S.` Geological Survey. K�v „ }.The impact. of. Ralston Creek and flood prone areason, property ,iy,+ valuesrhas been,studied:in considerable' detail by Gerald :Bernardwith the Institute' for Economic', Research at the s University of Iowa. Mr. Bernard has done extensive work on „w, 4 'this•"subject using econometric computer models with a -number „ variables. y Using block data from the 1970 census and the current value- •ions as;:shown on the City Assessor's lists, comparisons, can be;made ;'between the valuations of properties located in the' �n flood..plain.and properties located in the same neighborhood 'but outside the 100 -year flood contour. Not only can these ' N �� SxS , •, comparisons be made, but data for 1970 can be compared with;, , ,�,k • , ;, , current assessments taken in 1975) and used at the resent w., time. In ;the lower reaches of Ralston Creek,''' particularly through,; Central, Business District', and further downstream, there - has been a number of'land 'use changes in and along the flood" plain in recent years.. These changes in land use, together with the increased demand for multiple family and commercial. G"F�� land:makes any such comparison of valuations and the effects of,Ralston`Creek on the valuations extremely difficult. Although it is expected that Ralston Creek will have some monetary effect on the value of properties located along the " Creek or within the flood plain, various types of commercial <'uses'# particularly warehousing uses, can be constructed on :the, flood pla.in.with little additional cost. As a result, jq the, value of property along the lower reaches of Ralston y Creek has continued to increase significantly, because of the demand' for commercial space and the relative ease with which ,< many',commercial,'and industrial type ,buildings can be flood- ' Thus the effects of Ralston Creek on adjacent and nearby properties are difficult to evaluate in this vicinity i. because of the increased demand for commercial and industrial space.' ` R Y! it 1 A.. A''comparison of property values was ,made in four areas along 'AL+- Ralston Creek. In selecting the study areas, consideration was given to the location of adjacent blocks which were not it „ ,+• Sonly;outside-the ,flood plain, -bub very similar in: character w 4. st,tofthose on the, flood plain.- These are referred to as r "control "r properties or blocks. , The 'areas selected include two areas along Rundell Street y* �s(northwest'and`southeast); in area in the vicinity, of 2nd u `ks'Ayenue:and E -Street: and an area in the vicinity of Friendship {w++w'+ ''Street' and, Brookside' Drive Gt�ST ;The+increase iw property values from`1970 to 1975 is shown' ,table;fof flooplain properties as well `;rysinthe:followingd asthe''control'properties. In addition, the difference in valuation-between`flood plain properties and control properties is I. shown for both 197 and 1975. w + It,is'important to note that from to .1975 all blocks i containi ng flood plainproperties which were examined increased 4 in;value;except for one control block in the. southeast ,.Rundell''.Street ;area.,which showed a'decrease of, 1.29. Of *+ particular significance is' the difference between flood `'plain and non -flood plain properties' from 1970 to 1975. In ` all'.instances',the difference in valuation between flood 1 !: plain and control.propert es; was' less in 1975 than' in 1970' Jx7 (13ll: 28:,compared with,18.48), with the value of flood plain' properties. being lower; This indicated that the valuation of'properties.on the flood plain;are'being adjusted closer 'One tothe;.valuation of, properties outside the flood plain. i`bf the apparent seasons for this trend is that the need for .low-cost housing in the community has increased the demand "for many of these properties. 11 G"F�� .LLWC111uya ua a...ar rr ..� 1 tion between properties on the flood plain and control properties is relatively small. It should also be noted that while' many of the properties in this area are located within the 100 year flood contour, most homes are at a sufficiently high elevation to avoid the damage of -flooding `experienced in some of the older areas of the community. The'marketability of properties in the flood plain is obviously affected,by the potential threat of flood and ' added 'costs 'of flood, proofing or costs of flood insurance. However; potential', marketing problems of existing developed properties (primarily residential) are largely offset by two key factors: 4* 1 The -lower assessed valuation and comparative #N lower value than similar properties in the p;ineighborhood. 2'. The high demand for moderate and low cost i<sr '.housing in the community. Although there,js some reluctance,or hesitation on the part wt `s{potential> buyers `to acquire undeveloped property on . the � * flood",plain'.for.commercial:` and/or ;industrial development, the ",;rate :at -which -available landsare.currentlybeing'dev- d ti fit, „ elo ed sn the lower:xeaches,of•Ralston Creek would indicate t �'�'�' few• in -ma rketingsuch lands. ....,... ;UMMARY ANd CONdUSIONS: L11.•valuation's increased except for the control properties .n'ii%thei.southeast Rundell area which show a decrease of .1.28 r6 ' 1970 to,1975. The difference in valuations between iroperties;located_on the;flood;pliin and'"those;outside'the .lood plain, shown, on the table reveals.,that, properties on :he:flood'plain have lower valuations than comparable )roperties,.not on'the flood plain. These differences were L8 48 in, 1970 and 13.28 ih'1975. r ; Phe difference in valuations between those properties Located on,the flood plain and,those:free from 'flood is iecreasing ";''A major reason is that the demand for low :ostrhousing.is,great. enough that prospective buyers often iverlook or, disregard the potential hazards of locating on :he,= flood?plain.' [t`'is'ianticipated that'the!difference invaluations will :ontinue to decrease in future years as the threat of damage Erom'."flood': lessens. lJ!. '. COMPARISONS OF PROPERTY VALUES FOR 1970 AND '1975".FOR PROPERTIES LOCATED ON THE FLOOD PLAIN AND OUTSIDE THE FLOOD PLAIN DIFFERENCE IN VALUATION INCREASE IN BETWEEN: PROPERTIES ON THE VALUATION FROM FLOOD PLAIN 6 OUTSIDE 1970 - 1975 FLOOD PLAIN** .-.I 1970 1975` mdell Street IInIf Northwest Portion (76 Properties)- Flood Plain Properties 11.59 r 25.7% 22.8% *Control 7.36 � e � Southeast'Portion (59 Properties)' r Flood Plain Properties" 10.21 Dti M �' 11.96 2.69 �; Control -1:29 k Sir` ,fi '� d �`R'9'4f H'i„+ r �d Avenue &'E Street (28 Properties) �F Flood Plain°Properties 32.39 , c 27.09 24.29 Control 26.69 A r r�+r a_ iendshio Street°- Brookside Drive ,8 Properties) Flood Plain` Properties 27.61 rrd 12.49 Control`. 20.79 Q HOUSING AND POPULATION CHARACTERISTICS The type;snd character of housing on flood plain and non- flood plain propertiesis the most consistent in the Rundell`Street''area of those areas which were examined for the"purposes of this study. Practically all dwellings are single .,family structures and with few exceptions were con- structed'during°the same era. I In, the' Iowa - Dodge Street area and in the vicinity of A01<. Second Avenue and E Street, recent transition of single rfamily,,dwellings.;to multiple family limits the validity of, comparisons+of d flood; plain` and non-flooplain character istics of and population. in the Rundell Street area, a much higher percentage of residents:in.the, ;flood plain are under 18 years of age „,, (598 wand `568' compared' with. 34% and 298 for residents out F. n,, ?„*z y rside, the flood plain) . According to the 1970 census, r, a roximatel 258'of the entire population of'Iowa City is Pd Y , "under 'Ofwthosepeople 62, years and older, a much higher percentage iy f theWreside,on the,flood,plain than outside the flood P l: udy.area. Approximately 8%, of the 'City 's ws lain in this st :37� Y population is 62;and. _over. ,;,This compares with 288 and 32B �y� of the'people,on'athe flood plain being 62 and over:' Control', t;4 ti <t careas^in the Rundell neighborhood show 228 and 14%,.,fh 1 k'' '” of the population being 62 and over. f1 S r',Ownerfoccupied.housing units in the City account for m f;�ai�;Yrs";approximatel458-of, the total units. :.This compares, with to=':848 in the ' fouv Rundell: Street: areas: indicating Y ,l I �. y4 ;� (when,combined,vith valuations) that many of the residents are young families. with small children or elderly persons " ,W'� ��iw;w, swho ares on a limited .or, fixed income. A summary of housing and�p6pulation characteristics for the flood plain and non ay ,flood plain areas studied is shown on the accompanying table ,z,�;4e t,� y�l F b 1 5 r _ n , j h f L n T, i:. . ' �e "•:� . ,. . .HOUSING AND POPULATION CHARACTERISTICS No. No. Total* Avg. '% 'Persons` Persons Owner Renter No. Size Under 18 < Over 62 Occ; Occ.. Hsholds. Hsholds. 8 12 g 29.. 43 1.74 Z1, 11 15 11 27 2.69 " r;.. ;i S4 32 43 (749) 13; 58 2 60 ,. �lw' 34 22 17 (719) 6 24 2 83 , 11 56 28\ 36,(849) 6 43 3 04 3 19 2 9t 37 2 10.22 3 3 ,i. 9 1 10 2 9 ,- F '.Census of 'Housing housing may not equal the, total number of;housaholds !^ owner and. renter,',occupied Bing units that are ina renter or owner transition, or vacant w , 5 •r l ( t A ,A f 13? T• "n 4 Y !• u A iFu }e '.: AESTHETIC VALUES AND SOCIAL COSTS AESTHETIC VALUES: Z r Aesthetic losses resulting from flooding are often over- ' looked by those who are not directly affected because of "}` the' difficulty' in assigning a monetary value to them. Such 3q= losses do nonetheless exist and are very real. Aesthetic values must be considered from the. standpoint of losses, or r _damage incurred from flooding and the effect various floodLe. y °a control measures might have on nearby or adjacent properties }' and property°owners as well as the community as a whole. A review. of. conditions affecting aesthetic values and con- siderations':an be grouped into two general categories:" t�Ry4 'll,` The first regards existing conditions including the ' appearance,of the -'creek and creek banks and the appearance a Fear and condition of. properties located'adjacent'to the creekx, or on the flood plain. The second general category includes � k4, the effect future flood control structures would have on 1 Y aesthetics A closer.examination'of these items will permit;a more '7% , ` ' thorough 'assessment: of aesthetic values relating to flood !, problems and, flood control -measures. �A,Ru0. kr,t t� ry EXISTING CONDITIONS: In the lower, reaches of Ralston Creek r" wheresthe.channel is wider, and deeper, the banks, are generally x' steep and difficult to,maintain. As a result, much of the creek islined with,`,small'.trees, weeds and a variety of ,Y unsightly vegetation.. In. the .upper reaches of the watershed where the,.creek and its tributaries are much smaller, many a re as'adj'oining'thecreek<are maintained: as part: of: adjacent t44.k lh s pini lawns'in:r11 esidential'areas"or are;'in a semi -natural 'state in .box undeveloped areas.,In many such instances, the creek does, t'ii. ., ' `' +not necessarily have a negative: effect: on aesthetic values <; but•in some; cases,'' especially along smaller tributaries, the � k .1 cidek'can'be considered a', positive factor (during periods of normal flow) by providing an interesting landscape feature +� 'I <,y,., nor providing a natural barrier between properties.- wf, Erosion and subsequent siltation along the creek and flood ��t plain have many negative aspects..' In order _to reduce erosion ,(as,.well;as.,make: :low lying; parcels more suitable for y • development)' riprap, rubble and various kinds of fill material' have'fbeen placed in or along the creek creating unsightly u. conditions. Where the creek bank cannot be easily maintained 4t{ i i.y f 1 �l� ' +141 7 n4. 14r because of exposed raw soil banks, leaning trees, dead or dying vegetation or materials placed on the banks to minimize erosion, the appearance of the creek and adjoining properties is adversely affected. ,I During periods of heavy rainfall, Ralston Creek carries a LT amount of dead tree branches, wood, leaves, litter and soil which is eroded from upstream agricultural land and from the banks of the creek and its tributaries. U Not only is valuable top soil lost, but silt and debris is U deposited on lawns, streets and at other locations often requiring extensive cleanup. In'those areas of the flood plain which are subjected to frequent inundation, many residential structures are old and some'are in a deteriorating condition. The condition of structures could be expected to be much worse if it were not for the tremendous demand for low cost housing. There are some instances where there is an obvious unwillingness to.invest in'property improvements because of the frequency of `flooding,°;the susceptibility of structures to flood damage, and their overall age and condition. These, how- ever are: limited in number with the greatest concentration being in _,the lower reaches of.Ralston Creek where other "environmental factors have had adverse impacts. Much of r the;'damager':that does occur to dwellings is not limited to those located within thelflood,plain but includes a number �rI ::.of:dwellings ,outside of ,the flood plain within the sanitary ^sewer surchargearea..-;In this area many basements are, t ` subjected'to sewage backup which,'not only 'results in damage a* „ abut 'creatie s potential: health problems as well. , FLOOD CONTROL STRUCTURES. When implemented, flood control f-Imeasures will have a,definite effect on the community's aesthetic: environment. Storm water storage facilities created through -the use -of berms or dams will have the most significant, effect,'on.aesthetics: The larger the structure, ll, ',the:"greater the -aesthetic impact. , Such 'impact ,will be primarily visual'"and will'most commonly involve the'presence �. of :'the dam, or berm itself. The man made appearanceof. large ,earthen dams can be lessened through the use of landscape plantings': and constructing such dams with; smooth curves to a blend in with existing' contours insofar as practical. ` ;,Smaller structures, or berms can:be more; easily, disguised j and='in most instances will not,have.the appearance of a dam, 1q'" but 'could appear as a naturally existing landscape feature. w; The •size, location and nature of storm water storage facilities r.will'largely.determine .their impact on:aesthetics. In addition;';°.sedimentation and debris control in the upstream rv! portions of the watershed willhelpminimize adverse effects of'flood waters downstream with or without detention I ni,l facilities. �i Storni water storage areas could be a very substantial improvement especially if the dual uses of recreation or .:open spacecan be included. The occasional controlled flooding that would occur on most sites would not have significant negative impact in that the area would be --:;;drained-within 48. hours or less and, simple maintenance :,wouldcorrect such eyesores as rubble, debris and siltation. SOCIAL COSTS'.. Social costs cannot be measured in monetary .; terms anor,are. ,they fully'' realized by those persons whose' homes are not'in the flood plain or within a sewer surcharge area or other area directly affected, by flooding. .' r °For. _those persons whose homes and businesses are located on the,' flood plain there is "the constant threat of flooding. .`and=flood?damage,:to;their properties. During periods of (vA heavy.1'rainfall or extended periods of wet weather, the 5? =previous ;flood losses together' with the constant threat:of''possible'flood results in considerable' anxiety e' among.- many�of;the' res idents on'the, flood plain.; Such anxiety undoubtedly has some adverse effects on the life 'styles. of ;- some:of thesresidents, particularly_ those who are reluctant ;. to leave,their,homes'during,periods of heavy rainfall: in y,{�✓ orderti;that ;they may:'be' on! hand' to help protect their properties. J;4 from ,flood damage lin"the event a flood should occur.,.".. YtY.-i 'r Ii Ti J = ti. M y+�oOther.fears exist when the.. Creek is at flood stage including., --.,,,11.-1.`,,1. the danger;of':children falling into the Creek and being:;, �j+swept 'away•by `fast:-moving'water. :4.tindn Iv,,•4, 5:fe./.1-.:. '.,-I. .r ..-b,,...-., .. .'..• nn idpµv.4ia1 .Ralston Creek, and, related flooding.creates many inconveniences ,:: 2nd for ;all residents of the. community, particularly; where 7•�' inundation;of;'streets' interrupts traffic"flow, including; bus F7, " 4, service otherinconvenience results from the backup of r r`sewage into basements and'the'deposition of silt and debris on, walks, drives'..lawns and'other,properties. "Odor, interruption, of.'electrical- service;: -loss of income and dis 1, ruption,of'normal"daily activities must also be taken'nto ; i account s• r. SUMMARY AND CONCLUSIONS{ Another important aspect of flood control measures with regard to aesthetics would be a renewed interest in home improvement in certain areas of the City where the threat or frequency of flood threat could be reduced. Home imprcvev,ent and improvement of properties on the flood plain would make a significant contribution to the overall appearance of the community. The comparatively high level of education and per capita income of residents of the community are indicators that the public is in fact concerned with reducing flood damage in the community. Civic leaders have long recognized that removing all structures from the flood plain which are in danger of flooding is not a feasible solution because of costs involved. Thus, other solutions have been sought including diversion channels, more and larger conduits, storm water detention, regulatory ordinances and combinations of all of these items. Although certain sacrifices must be made on the part of the community, as a whole as well as those persons living along and in flood prone areas, the reduction of flood damage and :associated social and aesthetic costs will contribute to overall community betterment. Muscatine Avenue at Court Street 15, RECREATIONAL USE OF STORM WATER STORAGE AREAS INTRODUCTION " Storm water storage facilities should be designed to serve a'idual'"purpose whenever possible in the interests storageof as:;well as sound land use planning. Because many facilities will contain water less than 2% of the time, they \''' will. :;,be available for other uses or purposes the remaining 988'of the, time. Thus,.a!dual use of'storage facilities t should be encouraged whenever possible. `, Uses: that are generally compatible with temporary storm water-storage.include parks, parking areas, athletic fields @ uses which do not involve structures. F and``other:open; space r, that-'re-susceptible to flood damage. �ourt Hi11:Park on Friendship Street is an example of the duah'use.of an'area for recreation and storm water storage. " Although the area was not.originally designed as a storm water `it nonetheless: functions as such ,during storage facility, g� periods of.intensive rainfall. It is important amecourttonnthis ,the floor'of':the shelter and the g x site: are inundated,during;major storms with no resulting' damage' 1 1 Y 'STORAGE-FACILITIES g articularly the dry bottom Storm, water storage facilities, p ;type `which ,are designed to be'completely drained within 96 hours, or less after a'100 year storm ceases ,t can be ,extremely' "f ;;valuable�for'recreational purposes..,Many such areas can be } j,sintiined,as open space.,and would be available for rec reational:use the vast majority of the time. e 1 The size;and configuration of each specific facility will hale an effect on ,the typ6 and extent of, recreation facilities and uses ',that ;can; be accommodated. In addition, ,existing "and; anticipated land uses 'surrounding 'a storm, water storage site,,including.the location and proximity of 'existing park P!.' facilities ;'together with-the;types.of.activities desired or T, w .-,needed.will-largely determine the relative importance`.of a particular location for recreational use. �. Because the,use'of,storm'water detention areas for recreation rFr and open space uses is compatible in many instances,,major� J detention facilities should be viewed as potential sites for- A 4 recreation and open space functions . In many instances it IKr iM SI 1 r�?�1 1i {.Z r would not be desirable to develop high intensity use areas in the lowest part of a storage facility which is most frequently inundated. However, many 'areas within a storage> site can be developed as valuable intensive use recreation space even where inundation occurs once in perhaps every 3, 5 or 10 years. In"the event a proposed storm water storage area is to be used for recreationalactivities, it should not be designed solely for storm water storage, but should incorporate the needs of the dual use into its design and subsequent con- struction. Dual use permits maximum utilization of the site to be:realized while still providing the intended measure of flood protection for downstream properties. " MAINTENANCE One of the major; problems connected with storm water storage n is, maintenance of the facility. Storm water storage areas tl' serve ,as ;very efficient silting basins and where recreation, facilities such <as tennis courts, sidewalks, or grassed open Space,have•been'inundated, some cleanup will likely be requi.re,d '.' Surfaced game courts', concrete floors of shelters, ;" walks or; bikeways will;;not r be. damaged by.inundation but may ° be, removed and/ } 1 have deposits;of,si t which must mechanically r or with water.• The' of maintenance will depend on''th6 extent of:flooding,.the. time of year and the amount of'silt and. debris deposited in'the;storage facility:, facilities a(, s, 4by,;flood.waters:-<•"By"locating'.certain .,recreation at -elevations where inundation will not occur frequently, ; and providing:slopes and materials for good drainage, the to acceptable amount of maintenance can'be easily reduced an -`!,level. ! SAFETY• 1 When filled, storm water storage facilities could pose a tochildren who might be, attracted to them. The ..,threat hazard; can,:however, be minimized in the construction of storage :'facilities.by,eliminating pot holes and,construct- ,I 'ing dams and berms with gentle side slopes.` By regulating the .release of storm water into the receiving stream,', theE velocity=and/orvolumefof water;could'be greatly reduced. Depending on the`'size'and type'of structure, both velocity O* ` and volume, could be reduced. "Wet,bottom storage areas which would have permanent pools ":11,"''would,:"also-be designed with gentle sideslopes to eliminate the possibility of people slipping or'falling 'into them. Wet rX u{ ' Y� 1 �• bottom storage facilities should, however, be treated with the same respect as any other body of water. Where their use..' is..appropriate and desirable, wet bottom facilities can provide opportunity for a variety of activities not possible .with dry bottom storage facilities. The,"extent cf hazard which a storm water storage facility presents must; also be weighed against the far greater hazard which would otherwise occur in the downstream portions, of: the;: Creek whereuncontrolled flood waters increase the potential danger in those areas. SUMMARY'AND CONCLUSIONS Since'dry bottom storage facilities will be completely empty for: over. 988 of.the time, the areas are well suited for alternate? -use.:., most obvious dual or alternate use for - most storm `;water;storage facilities. is recreation. because,_ most` recreational uses require proportionately large amounts a of ;`open space The', dual use of. storm water storage facilities should be from. two major points: ' l)1,the adaptation; of existing recreation. sites (as well as other, areas) to accommodate the storage of storm water, e 2) the adaptation of storm water storage areas to accommodate , as xional'or other dual usage. „ t recreat InTorder to gain. maximum use,of an .area that is to be con d'I 'js''structed�for;both''purposes, itis,necessary to determine in advance".the''immediate'And/or i future recreational needs expected'.: tobe'accommodated'at the site. This will permit •.the; area to be designed'. for specific recreational activities'` `n filities which can'be taken into account when the y',orac ti n<'' `storage`'area- is constructed. Since storm water'storage facilities will contain excess ,`"'storm'' runoff approximately 28 of the time, it is only <reasonable:that adequate, planning and consideration be ;. given"'to'the proposed dual"use of each'site during design • and`_ prior :, tor construction. 1 , L: : I NlYi ' a w«�1$ : TRANSPORTATION AND SAFETY TRANSPORTATION Vehicular, and pedestrian transportation in much of the City isseriously affected by flood waters as shown on the accompanying',map. Water depth, for 10 -year and 100 -year �l.le-` floods.for';selected primary and secondary streets are i shown; together with the locations of various emergency , s..',ifacilities.' +: Inundation of streets is obviously not as serious for a 10- j " year'. flood as for a 100 -year flood, it does, nonetheless, result in 'street blockage at various locations.. Street t' restricts travel on many cross-town routes and ,flooding thoroughfares:including.First Avenue, Muscatine Avenue, Bland Governor; Dodge; and Gilbert Streets: r' ; extent of inundation of First Avenue was increased when R r'p' h tthe street'was constructed and thegrade lowered. As far c street construction is concerned, this' was a normal r 'and':usual";practice;:however,' little or no consideration s was given to the potential', flooding problem. Storm sewers in this .vicinity are' too small to be of any C, significant value during periods of flood'. n" r Future construction of Scott Boulevard to link the American. ip,rri` 'Legion` Road with Rochester" Avenue will provide' a north -south x cross=town route on',the'east side: of the City that would be from' Principal east-west,'streets affected by flooding are Jefferson, Washington,;,,Burlington,;..Court, Benton and Kirkwood. Of the 'grea,:est imary and.:secondary'streets which are inundated, ,the depth (eight!,feet) occurs at Burlington Street near Gilbert , which'. is one; of the.most'heavily traveled streets in the d=p community east of 'Riverside Drive. This segment of Burlington h , Street carries approximately 15,000 vehicles per day. Blockage of :'cross-town routes results in considerable se-routing'of traffic onto minor. or local streets, however ,.traffic movement from one area of ,the City to another is ;r not impossible except, for areas in the flood plain. while secondary`.streets are blocked by floodwaters,) ti}many"primary;,and few:areas of the community are completelyisolated. f ' 18 ' Emergency_ vehicles such as fire trucks, police cars and ambulances can, move across town but their routes are seriously altered in and many cases much greater travel is required. Thelocationof certain emergency facilities is shown on the accompanying map. a: While transportation, including pedestrian travel and private auto as,well as.City buses and taxi cabs will be disrupted, it -is important, to note that the duration of inundation is relatively short: Inmost areas of the City, inundation of streets, will not exceed six hours: 'During the 1972 storm .streets were generally;, inundated from three to six hours. • The time will vary depending upon the nature of the storm �:. and.,ground conditions at the time the storm occurs. CHANNEL RELOCATION Over'the'years the Ralston Creek Watershed has been developed k with. little or no regard given to the Creek or potential flood problems. Had.adequate:flood',or drainage easements b P een rovided;when urbanization of the community began, r damage•°from flood would°be:virtually;non.. existant`today. IG Ralston ree Ck'andittib n h ,;s-rutaries,have:been'encroached upon k x by:man to the: ext ent;that'.the'channel has been reshaped and }sl, re-routed in'many':locations•to boinoide with platted streets or ;'alleys." r Principal aeas where the channel,location has been altered -`- .^r :. :include:.', Q: C Yr c, A The area along E`Street`between First: Avenue and m';, Muscatine'Avenue,.where the creek is in the right- of-way of E:Street for, approximately four blocks. B The 20 foot wide alley; ;adjacent to the railroad right -of -wayiconnecting:H Street with'the first alley east; of. Rundell Street. , `C: 'The alley between Rundell and Grant Street which �r ' extends from the; railroad, on the south to Court r Street'on the north. :(In this and the previous locations the creek channel hasbeen straightened or. relocated to occupy the public right-of-way).,; H: D. ,At Van Buren Street south of Burlington Street, the creek lies within, the street right-of-way, and ,i 'prevents' further widening of ;the street surface rw or`installation of sidewalks`os:the.west<side of the street'. (The street pavement in this location is situated on the eastern most portion of the i right-of-way). t e _.. - ... _ Y. �ialll ^ jl ,f � � I _��. � � � � 41 i. �._t _.I^j.'�I< I �•�;� M J i �•�_'�' loo Co: Nm. A,... /1�.���.r 7 �I I �.. 1 v,J �.. I I 47 4 .I 1 i•, �.„ i , I'i.. i,� � � �.: 4. � 1 ' I {Krrtr 1 I i O 71r �,Lt:Nll 07 UL n • 1 it r a + j' 1 1 :L! j� STREET FLOODING - I : I ' .1.� o.z^{ PRI TE ;Jit PRIMARY STREETS.. • I�IAMB�LANCE ,I SECONDARY STREETS f6 'r•�!1a 1 1 �• c I 1'j,. � Il,i � L.: �, I 100 YEAR FLOOD DEPTH (� 11 10 YEAR FLOOD, DEPTH 1 ,' ��i 1 I �� ,� �i, ,E INUNDATED AREA -IZ11- INUNDATED STREETS rir �.•� Powcne • WILLIS a AeeoeuneIOWA CITT, IOWA 1 I .�... x..c.. LINDLEY S SONE, INC. w w w r ✓' ` \�. ./J N NINL04L, ILLIN011 ® +I III Z�,X i, I �rl u" :t F I E FF 71- I I I K'Ll -Ml 'tJ U Z.V E�j m 'mull UZ I Rq1 J . Na[ 0 10 67 V "X EZ 121 l' ,i JJ f ;'i I��O Z JL.k.:u T, All x E. Ralston Creek is located within the Linn Street ; ;. right-of-way from Prentiss Street to a short distance south of Benton Street. In most of theseareas,, the Creek is accessible to the City for maintenance. ,rev The Grant Court right-of-way crosses the Creek between Grant Street and Rundell Street and is a low area which "d! Permits water to escape from the channel and overflow into r adjoining low lands on both sides of the Creek. Filling these areas could help reduce overbank flows in the Furthermore, if other suitable access to the rvicinity. channel is available' along the street right-of-way at ot7. her locations, the City,should.consider the sale of the Grant t�? 'Court Street right-of-way- for 'two residential building lots,' ; one,fronting,.on Grant Street and the other fronting on Rundell Street., The:5th Avenue right-of-way north of Jackson i., Avenue,could, also provide a residential building lot. By -,adhering to,proper design, techniques for construction on the t flood', plain, three usable residential' lots could be developed 4 J at these locations. 1: �••: :SAFETY,,':..;a alley,between•,First land Second Avenues' terminates on ;W + either side.of.the Creek. Barricades should be erected to ? ,a^ , i prevent:vehicleis from rolling or being driven into the ,.: r•� r , , Creek, A these points. NdI :. •i a r ' ". � � f� Jr ll,�r 4Y � 'n1 PI... r. la , W A recent bridge inspection survey completed for the City shows '.'1�.. culverts) on Ralston Creek to be''in' need of!;• k attention The most critical' is the replacement'of bridge', ... _ .the at`Muscatine'and Court Streets and the City has already +• taken: steps to initiate .this project.Thestudyalso N recommends the replacement of the Iowa Avenue culvert in y approximatelyr l0, years. The; west.rail, needs to be, replaced. on the'Evans_Street•Bridge, and the',Washington Street, Bridge ..needs to have beam spacing adjusted to permit increased loading.; The Governor, Street bridge needs to be reconstructed. 4 ': Whenj°bridges or culverts are replaced, or new ones are +' rt �+ „+ con= structed in undeveloped areas,; it is important that full ;;,consideration be given to anticipated storm flows, thus t.. a�rw avoiding any undesired restrictions to the channel such as *" those which have occurred at many locations in the past. Yid x e. 20 n HEALTH PROTECTION Inr Flooding is often the cause of physical suffering and can also i lead to;great,mental stress. While the incidents of lots of `life and physical injury can be counted and tabulated, the effects of mentalsuffering are hard to evaluate. The type and magnitude of threats to life or property, when I measured in numbers or dollars are often the only physically' LJ convenient.tools available to determine the effects of flood- ing on health. .."Health":considerations in this study are hmitedi,to''significant factors which` contribute to our: personal environment and mental attitude generally contributing to a state'of "well being..: Therett has been no attempt to study in depth the effect of flood- ing;on;health',,but ';rather. an attempt to identify several significant factors';and make a judgment on their value. These value judgments will be 'important in later considerations where:'priorities.must be-assigned.in a plan of action,' The significant factors and value judgments may be defined as: n ,Ver Hazardous'— Factors that may cause severe or r' ,' abrupt nlury,oraoss of life without warning. ^b J V h 1:.• . A deep,; fast moving water o. ., B swater conflict with electric or gas -utilities ,++ c O C: 'living'areas', subject to sudden and deep TM f100ding,4 D."deteriorated"structures,'fallen trees or"floatable debris located in`flood way r� Hazardous Factors. that may cause injury,or,'loss of life m'4Dalthougf-some warningiisrlikely. A. high, -steep,;. unprotected creek banks n B'.sanitary sewage. C. after flood clean-up operations D.=flooding by, slow moving.andishallow water in occupied r' residential,:.business or. public areas E. temporary disruption of traffic on major streets N a a .� R i Undesirable - Factors may cause possible injury but to be of little value to well being.. are considered A 'bare stream banks, soil erosion s B. small amounts of litter, debris or sludge bars on creek bottom C'... 'noxious weeds, insects, dead ,trees D of traffic on local streets ,.{tempor'ary,,disruption E' temporary inability to cope with environment Desirable.'-:Gensr'ally recognized as being of value to Kwell being "rass, trees„flowers:in lieu: of bare A ' , vegetation', -,g soil,on'stream banksY B animals', birds, insects .small YC,m�open space, parks, -recreation areas "D trees shade, 'or view ,>largeimature offering e areas such Ey� ;low maintenanc�as garden spaces qq •911'41' J ii >'\l � �`t f I { , ! = � 7 p > MARY7AND CONCLUSIONS re -location of 'RalstoniCreek to coincide with',a gridded eet pattekhJindicates`that�little or no; regard,was given 4+' Ralston,Cre'ek when'. areas' in' the flood plain were platted [Aeveloped-4, an.:s;encroachment: :_upon.the flood, plain,ras 1 as the creek itself;,has"created conditions,, which, during •iods`ofilloodtresult in, extensive property damage and;:poses hreat.'to"human'"life:and'safet ure development. which, encompasses drainage courses 5' iu181;'contain' adequate: provision for drainage including essary easements.+ I r , c+� i � Traffic is disrupted when Ralston Creek floods. However, travel from one pact of the City to another is not impossible (as long as it is outside the flood plain) but will likely require considerably greater travel. Public transportation and service by emergency vehicles is hampered by inundation ���\of numerous streets in the onnmmoity^ � Flooding can cause health problems, out only as a possible source of physical injury and chance of drowning, but also as a cause of mental stress and suffering. Mental stress oau continue for a considerable period after the actual flood event is over, before houses and neighborhoods are restored to normal. |�,;'-.4` � Iowa Avenue and Governor Street Area � � � � . |�,;'-.4` � Iowa Avenue and Governor Street Area � � `� ,Channel 'Flood Details ss Plain 'Flood Details CHANNEL AND FLOOD PLAIN DETAILS Ten location maps have been prepared, using 1" = 100' scale topographic;maps;as.a base. The stream channel and flood plain was then physically inspected in the field, from, the confluence "with the Iowa River to Scott Boulevard on the.South Branch and from the _junction to Hill Park on the'North Branch. Notes were made ;Hickory. g such 'problem -field, locatin and describing in, the g r .'areas as:.. r� Eroding channel walls. 'Sediment in channel. 11 C Floodway encroachments. ;+ + Blockages to stream flows. v+A «D hive been plotted on the drawings together: items with an' explanatory I teat X14?�'",•thP�e+''�v+'�a 4F,;rti44e, w,+�70ther',items,',identified,in' the drawings include: The.;10 year and 100 year flood limits. .. .4,T�,Man-made features`? such as'fill.areas, rip-rap TB housing and commercial structures, r°t{ protection; and retaining walls �i; vThesezdrawngs do'not.,indicate possible solutions, but are intended'to,;identify many, of the:problems that presently e-H .•exiat;<TIPossible';solutions'.will?be determined and. added to drawings foriInclusion, in; the: final report containing �•�1�>y„the 5++ plans and recommendations'' q r 13'ri,W {�iY Fri J�[fl R 41 n i� it �'�h 7141 t ti i "1Ahi WPI�`i-tk F✓ I�� 01 i4`n I A,1 7 Iar* n' Ju�'"(�J tia�tJ h , .et �4''�a is1 Er 1 23 1 �:� � FLOOC -F•\la=-*A®10Mo.+-1==_�vlmi-FAI.kgI►,I1:1 mw:- NI; A \ < IOU? Get C Ott 11 11 d 0 .0 1V_..06 AWA r R I ,, 1. 11 'V7 Topographic Aerial Photo Revisions, Mapping byTri Stott Atro Engineering.- 1974 Street II' protected from 12. LIFlyette Street bridge dock and center st$ West at the channel pler were removed In 1976, but abutments Flood Level from HUD-FIA uorit floodlng.�:. , , still cause encr 0 oc hment-ind ere failing. (Flood plain Insurance) d culvert has poor'. Railroad trestle with 5 sets at piers In Studies by USGS.-1976 4fintl wall encroach- - channel catches debris. Areas of roadbed goilld'has filled due are In very poor condition. riveway to.commorcial, 14. Approximately I dozen housing ubits and z dozen commercial buiiiiiiiii ;ra In n'Sinton Street culvert 100 year flood plain. plaw of a . - . , . ; "" . 15. Dubuque Streit end Kirkwood Avenue 50 0 IO 10 *10 lions are Identified as., traffic suffers from frequent flooding. 2 16. Ihis commercial building It frequently strial"sWtory'stwer exposed to several feet of flood wileri U.S. HIGHWAY 6 TO ROCK ISLAND RAILROAD POWERS - WILLIS 6 ASSOCIATES LINDLEY Is SONS IOWA CITY, IOWw. HINSDALE, ILLINOIS sl; Fldod area limits are based an QID0 "2.,, Area SODD cfs.: and Olp • 2100 cfc �!: �.Ireq u Overland flooding on Benton;' Dubuque'i, are s and Kirkwood was observed In 1962.,ix:��hr'8::.Aoere IV occurinq tiers. of the kA11!V6 WUVNIVIN�wm n r _ 2 �OnEN ✓✓ r Ikk As g � yroa � — , � �� ♦ N �� �c I o`+� , : a � / V � • � N 9 Topographic Aerial Photo Revisions, Mapping by Tri Stale Aero 9, 1 floor will bo..;, -&I3. 1, Approximately 1 dozen residential and - Engineering.- 1974 ,5 2 dozen commercial structures ere led by turbo • ettecled by 100 year flood. form sewer 14. Old clay finer plates still have some use Flood Levet from HUD -FIA �• as channel floor protection. but, are d with slit and debris. Good Plain Insurance) talninp wall mostly covert 15.. Channel wells covered with grass end Studies 6Y USGS.-1976 ir1deck and smell brush -Looks woody In summer Floodway but provides necessary bank stabilization. �- r.Structural W: Some silt and sediment bars cause no sae limit slgnlficant problem except within culverts stringers ` when (ample o nee Is t • plemlmbenk m. 0' Pb1e.� of�� c . It. Good example o1 urban streambenk L�. I concrete .I lendscepin9 and slope protection. Ddway floor ROCK ISLAND RAILROAD ited In TO WASHINGTON STREET POWERS- VALLIS S ASSOCIATES LINDLEY B SONS .IOWA CITY, 10WA HINSDALE. ILLINOIS .4 a~ N b: ,., ,.a: •, A .::. 7w' r,„' .:.G ,.Fit' '� ” y � �� r 44 rk�s� cr ry 'NDTES+ ,< LjSevenl rail road trestles and spurs have ' T 8bnormsily roughYhanndYleoS ail s , „i • r. * been removed from this area in recent modllled In 1977 G:, t , GEND years., - 8 'Channel will eroslon caused by:fu 2. New. Cllberl Street and College Street _ whence, from new Winch storm sewn 4tR4 r bridges have Improved transportation; on. unstable .durMg flood conditions. 9.; Channel constricted by,retaining, Mm Mode FlII t 3:'. Commercial and spa rtmenl redevelopment, rv, but fioodway Is.claar. 117 ifxiarebl Woi1 " ' � ' of older areas Involves filling flood 10 �Very'oldbrldge'wlth timbar dock In s Sopa Protection. plain.'. +v handrail and stonewlits Floodny r�InClaaarl x r /. Prentiss Street culverts 191 7,5 It. 1118.) .f�,above"and adJaentIs clur'C;Stri rj.EiwoocMwd',., . act as a debris dem. Chain link fence , Kanalysts shows .need lor load Ilaltk 9ofd8ardryr. collects debris In fioodway. NW approach- and repelrl replacement of Stringo* .rry,(:r f i . failure.'.. .'sE and beams '+.i 1 Burlington Street traffic will sutler Met Ii. Bugged;l2 span 16.6,k 101 conch o ' " V .E from lreguent flooding:,West,span of r, : sbox culvert wltMclnr+lloodway, fi'ol Flood tNcler bridge. Is filled with sell because channel 2,:overhead but sediment tntloor..Is , - InD, ti Good pie of 1 cted tloodway style stream end downstream." 12 i Sanlle,ry'aewer In mid dr c7os d� �� channel but will be'`relocaiad'Jii Bbl 6.:Small storage shed supported by falling 1977 parad Trees timber, will. no will, 'lav h„,"i'Fi�P 669 • „ '! „ N U lam' .. „— —A i I I� ate•°' 7 ♦ JEFFERSON ♦ w.a ♦ ST T IbeNM N - I I / Z am a 69 rw �a n.a WASHINGTON _. ST _. .—. _. VGy, _ — cap -- of i1n 1 n -- . Iazilq - Topographic Aerial Photo Revisions:.. EoteItonted 14. Wln9wall support for bridge hes felled Mopping by Tri State Aero kk'&Sedlmenll {?, , and needs to be replaced. ", Engineering.• 1974' rj,'SanItory 15.' Roof, Interior bracing, creekslde wells unix culvert. and glared life foundation walihave' flood Level from HUD -FIA llned tolled on old small garage for 11 vehicles. m li Vush ' ` Some danger of blockage of the bridge II (Flood Plain Insurance) hai summer, this washes out during a flood. Landfill Studies by USGS.-1976 ances to flow upstream to protect the structure. 61 bink slob-'.•'' 16.i' Small low concrete footbridge catches ' - debris duringlow stream flow conditions. ii opment 17. 4".water or swer pipe, 4 feel above floor sit above the of channel, and deflected Nfaal : Pome' of i^R7i�F•'downs ireem....' ' SO' D 10 00 e7O eloAgNbe creek' 1k:' Erosion and washout under the storm d'provlds nice 5 i- sewer: 111 nimals 19'Open floodway affords safe flood transport. Stryat.box cul -,:'_20.' Crumbling stone. wan may collapse during WASHINGTON STREET t1y.S00 acres ''. flooding conditions and Increase flood.. i Ith traces of hazard. , TO es y7+21. Sheoticoncrets or stone retaining well C PP STREET as ire vlslble Is erected and broken but still supports rotectlon and -the soil. it floor because 22. Litter from this sten tumbles Into the creek. ' POWERS•w1LL158 ASSOdA7Ee LINDLEY 6 SONS 25.' Structural analysis requires restrictive O ' I IOWA CITY, IOWA HINSDALE. ILLINOIS load limit and one lane of traffic. p '�•` 'r'illll�I PHIRUJI1313 Id K I%se' .n Yr♦ ni 7 > ! b„ m� ST ASH Y x•� WINGTON � .I I 1 _ :)S•..,k�n'>A•"�4,x..� walk. ,R:hua. d... A,...h. x w ., .7,: ...: _::: n .. :�-.. .. ... . . .' .... ... ., a../ •-0,.::H biz � o 1 Design Flows for 100 year flood S OOD ,::' B.; culs'lad. 'lad. cls. end 10 year. flood -2,100 cls. concrete on walls 2.` Approxlmotely I'D housing structures partially blocks the lie •..5„ �'Ii0 •' , J ° ' LEGEND ' :' end one hell dozer public buildings or sewer passes through"� commercial structures are In the 100 9 , Most of the crook. then and F �+;C',r'+{�+�,v{r'6��1ij;4r�yr r, 4,t •r",'�, , 3.� Several rear ail lines have been removed ., ;.whicwith h lookswbrushy!' )d1 ReceN Man:Made F911 from this area In recent years. Thla causes some reit +}e 5, ,�, 'Eroded Channel'Wall x 4- Falling retaining wall Is. to be removed In ',,' 'i. but provides good chin 1pRup, Slopn,Profeellan ',:, '� �`1977..Floodwater overflow causes bank illlzellon . ?•+'^'r'r`j , M", In Chdmit' erosion:: Recent Illi prevents ovarbank ,, 10': Very taw example of r 'o � ,;4�Sedlmenl . �. flooding from flowing back Into creek. . - with required fl111 ng � H floodrroy �naaodment ', S Rugged old retaining wall provides flood elevation x,�4'>x ^yt rt'a eg,gS Food Plain Bound I r ry _ : good outside bank erosion "Drotectlon. : 11: Dozens of mature lreei 'd�+*; ZI—'—" X31'+•:Cq I ' Sy Qoo Housing structures encroach upon the floodwey and floodplain In abundance and In this neighborhoods � ivlew.and habllat_for;st 41P'.4 -al Overland flow of flood Water 'Large rMf•�9 present s frequent and slpnitlunl ex• 12.0'.x 44'Johnsol , Structures r - � posure t0 flood hazard. '.r vert draining epprezlrt '® 1i■nlirq Udb !: 7,'. Frequent overland flood flow away from discharges Into creek Commercial ;i u , ..the creek: channel caused by gredat sanitary waste dlschar Endorpered Tran medians; curbs and houses creates trdllc U.: Soma old clay liner pl Retaining Wall disruption, high velocities and flooding r but provide 11 Ile bank i',a� v�. `r, ,� y, -: •,r , ' of barked automobiles. no smoothnessto thio +" m '+ of slit and debris, r J c; all.IJ _ o Topographic Aerial Photo Revisions, Moppingby.TA State Aero + Engineering. -1974 •12. Channel his large cross, section but Flood Level from HUD-FIA «turns and Intersection with North Branch (Flood Plain Insurance) Studies cause turbulence and energy loss. !,, , by USGS. 1976 19ii.Under, this bridge' Is stream flow gauging f �station originally lestalled on Ralston - r.Crook at Rochester Avenue. (Then tailed a` ..Hlghwa 11 In 1921.. :; �• �' p 1/ ` Beginning otbri-oltequipment Hickory' Hill park, Pomr ol�O 15 Footbridge and egulpment building on perk. 0 0 - - ro 7h0a r' 16.(Timber retalning wall on outside of curve S(NE) protects residences but encroaches - x, Ir on channel and floodway. 17':,4ery old tone railroad bridge abmments NORTH BRANCH RALSTON CREEK suss W turn In meandering channel FROM 1 L� an a overland encourage across low lying lot. errors CONFLUENCE TO HICKORY HILL PARK encoura ow to e 1 t j.... POWERS -WILLIS B; ASSOCIATES - LINDLEY B SONS IOWA CITY, IOWA HINSDALE, ILLINOIS' . y J � i {_..1, '.':' _a 1"yK lam tti �__ \5 i •y: :. �Y �b • s s i+0 el L 14 ir] } ri.ttiBT � } •` .l. e.. �r, h2.4-,n I GL N • l �' r 'rr. �r ,•` `' 0�5P S, / A�R�+'+'gFYY�SYd,^MS'�4!��r).+ +w s UP NOTESt �u1..}K!%' I�h•','A9rYAS�s1 �Mn 5 (i r , u 1tFeL, rxl , s4t L Flood area limits are based on T. Concrete sno rock rubble erosion i11$i�lAtB l� rRaarA Mar Made Fill; 0100' 3000 cls: antl Ulip• 1200 cls.,: control for 21!;. storm sewer. discharge . r , yJ , 2. APproxlmetely 16 hour nay units ere c causes sediment by under. bridge 1{- ,.rFsOded.Clronnal Wall allotted b the 100 flood lain a.' Overland Iflow.of flood water down�;;;r Rop�Sl00 PmbectI :, Y year plain although the potential damage ; Jefferson Street was observed In I I2- '>�0.9p,Sedpner�l(nChoarel Is minimal here.1965, and 1962? t f5 "T''`''.wwwMnr �Iloodway�F.ncrooctrrnent 5 Old railroad embankment Is major. earth 9;. Brush end debris cause slgnif ion' ; Hl,• with some effect on overland reduction) waterway opening toll 'W 9 f \ a Food .Plain Boundry qq " flooding.' Natural vegetation has holy rainstorms '";;rlJkt`$• 4 YP CIM* 4;a r., ! , i ;overgrown (Ill to blend, It Into 1D. Dear s downstream from stream gaugIn)1. rr�st1((�e '✓ ♦ i50vwimid.Flowof Flood Water surroundings. • 'station Is'gaod energy dissipater,durins vc ^``s'�dfs•7t4V,PSfiuelueee I Ii-This Is the most densly wooded,' ` 'normal straamflow. •:','-'S Hauekq Unlh '"`: naluni,eppnrinp flood plain Brea In 1L, Last section Of pipe on 24 dorm ssaet '� watershed:. and heedwalt:have settled and broker�w •"Commae! 5. Most houses on Jefferson Street do because Of bank erosion "r1V,6 11 Q1 �l m Fndargarad Tees not have basements. ar. - (a+ Mtoln p Wall,,6; Areaofflood plain owned by the City and used as neighborhood recreationG,! area with very few facilities.„ R:AS <rM r�r w; r%�•,��I� 1 . �. \ .. if w •.,�.",?'ikY: 4 y� . g� / 'jijr41 !MS N' , d t v. r. ,: u T^r �... A.. , i iny:ErJ ¢,;>r'J�•. ■ >« to mak' ft -78. I 7 Ll RUNDELL f i I �t ❑ , I _. SrgEET. 1919 lF i Cl�r b =ifs—� •_ J_J _..� pJL p Topographic Aerial Photo Revisions' Mapping by Tri Slate Aero Engineering. 1974 bridge ` 13. Major sanitary sewer serving the easy flood Leval from HUD•FIA'� hannel Dart of Iowa City Is subject to severe structural end frequent flooding. (Flood Plain Insurance) I overlay. _la.'. Falling timber retaining we 11 and slipping Studies by USGS.-1976 IIsoil bank encroaches on channel and 15.' Storm sewer outlet Is plugged. 16. Construction of relatively new bridge 'e left old timber piling protruding I - 2 !' eel ; feet_ and pile of broken concrete which plau of Illect'. Calices smell dam. 80 0 10 00 �. �O iL Steep men made banks of relocated stream later channel, nave grass protection but are -from still slipping here small t ees with long •Ural or -.`If. root soncrete ms a arenq t pr hes been rebuilt' SOUTH BRANCH RALSTON CREEK wilarea, end strengthened several times to assure GLENDA of ,COURT t dream' supporPol tete fill. AVENUE So's from 19. Several lances, smell buildings, trees Isements' end debris hinder overbank flow on adjacent law lend, 'V POWERS•WILLIS d ASSOCIATES LINDLEY 9 SONS IOWA CITY, IOWA NINSDALE, ILLINOIS {h a Jp . r COL EOE cr,.. r a d%// 1J✓—� / 1 : H L —� A ��T / J y 1�a.F1jjj VW 77 Od t:. S M1. i O � 1:. ✓ A dP . � � f 4 re' 0. yd.�.�B• .1 ti 'i sJ a�,'ih A�4 �5 �-r t � � �� [r+ �� � r: : 0•'y�'e4. E('ea.."+rG°�n�YY,d� 47iE�{�,.ttV1 n'" �.-4�,:1 re ' ,e rt i. , J '�';: � 4. yV"}r�pi :.11nJi zYi°^IE^,i:1'�•:+ cihi"i i{ •r �4}� Y.'sf J t .: { , y i. .. ( r t.C,.x4}tl 'IE Fk.i+" !q'�+,dM�t d Ht rj' e v�+S - : � , , � •� � i ...ted>. 1,O Flood t r a Street bl 1„ Flood Area limits are based 15 !.'Is very poorly Avenue and Court ream* o '.0100 2940 cis. and 01 • 1150 cls. >: Is very Poorly allpnetl with streelntM ,x 2.; Approximately. 110 housing units and ' and entrance Is restrictive. Recent st .,?:,o,�,w; s �r„r °,yl°!i,., .;., -., r.; �+ ti , .�,` <. a neighborhood grocery are effected-anaiysls shows deed load of pavement I ov fryx g, �,ReceM fdrn Made Flll '. by the, 100 year I load plain. r ' requires S.ton !load rr •{r ; Fnded,Chonnel Woll ° 1.:;Timber. retaining wells on outside of 9.., Concrete retaining wail has cracked a 0 I �4�rd,:: i' , ,� , , n Rip Rog Slopei.IxroOclion ,, ,r 1,'curve protect& residences but " .Oiled but still supports colt ., encroaches on: channel and Iloodway. 'foundation. Sediment M f'twmal n .Fbodwy, EnaoodMgnta , I 4. _This Is the most densly wooded 10 Underdeveloped land in dedicated I tick i rr 5ikw; i F PIaM bW^dry'r I naturd appearing flood plain, uee In ` _ R.O,Wi'allows overbenk Iloodin to H iy slit" 'watershed. ., . adjacent streets t I Ti, .ca tia. t ; Oq., .5*:�•r " ° - ' ' S , Wide.' open flood plain aids entrance to 11.. Several trees 6 10 Inches In dlomii :slightly misaligned brldge r: .: and up to 30 feet tall' are In danger I Pl y 'r;♦'♦ri0wrlond Florrof Flood Wotar ^ + , d,:'Very good example of open,: urban 'bank erosion E,t�'+ii'N;rtrr 's''rr"`�SlrucMnx f'rYl, F +>;devetoped flood Ficin without lY. Most houses are 'located high on natu� ?��i ®r u Halekq UMh ,+ encroachment, man made fill In the, Rundell Street 1'r'7ar,•,>�ti� ®z hr; Commerelol'% 7, Long sturdy,co retaining writs , but the streets an very low:: Present +4,- s'Q +.,Endanperad Troes protect rear of houses from erosion channel In alley was raiocaled1n,1931 rr:,! ++•.s Rateln Woll.. and foundation failure. street location. Many homes havebit subject to flooding tiE .f�., rtx fi'1. ` I I i:r :7 wwit �{;{;'3y,rlid�rJr i IJ / rf 1 O w lr ✓ St .. /nI s i I • 01 %I4 t•t Topographic Aerial Photo Revidons, 3; Mapping by Tri Stole Aero' rF :; Engineering. -1974 ad overbonk 16. Several new housing units and related strlcted site lilt In recent years. Flood Level from HUD -FIA I(�� especially where 17. Residences appear to be in serious jeopardy (Flood Plain Insurance) " 7th street from frequent flooding.:. and slope are 18. Breton concrete revelment end small trees Studies by LISGS.•1975 ompensele for encroach on channel �a 19. This section o1 the creek ending at Sheridan Ii�I its surlaci Street appears to flow under flooded allroadi conditions Independent of backwater tiorl. from the North Branch at College Street pyo, of oslon In ditch. 20. Intermittent short duration flooding 50 0 k.{ 1 ro W In cree; results from restricted Interior drainage. 0 C oma cause 21. This stream segment from Rundell to y: Sheridan street has very net slopeslopeoa SHERIDAN AVENUE embankment channel bottom. ncroachment 22. There may be a 20 foot wide, City owned r R.O.W. adjacent to north R.O.W. of TO clad tires railroad from N Street to alley west of F STREET 7 gatnst erosion. Rundell Street infill floor Is Valliant is eroded. POWERS•wlLttS r ASSOCIATES LINDLEY a SONS IOWA CITY, IOWA HINSDALE, ILLINOIS Il s u'- \\ \\ + t x ��$�' .�,7s,O/'N '•\ri'�• � Pry • y•,\ � ..\ � � r IMP. 1ilz- �.� a .... NOTES, LIE GEND I. twom area limits are based on Qygg ' s. Rslstoo�Creek channel Ind ove �r A} 1 1,910 c1s:' end 010 - 1,150 cis. floodway lira severely restrict !.Approximately 52 residences ere affected ad ecent,tonllroed 2111 espec11 \"•�;:3,.;.''c'�`'"`'1."' by the 100 year flood 9lmits. Rundell,*.�Dnrborn: end Tth`sl },RaaM hWr Mode Fill : S, Several emergency,'switching manual , encroach.. Channel depth;anfr E�. Dowel Mbit . - ' ; operator. fevers 10 overhead primary electric greater then normal to compen Rip Rop Slope protection power lines ere In area which floods. nIrrow floodway. 1{IfA;SedknudYr ClrorrNl /.Wooden fence aroend storage yertl is B feet 9,'. 10' x 10. stone sYch carries du ? t ^ An; high and afflictively eliminates any over- drainage south .of.rellreelI Fdeelaroy?, EeaOodmaM lend flow of water, 10: Sanitary sewer pump stattolkZ� RSx k>rK iFV\ {' d Flood Plain Boundry Y S. Sanlcary sewer manhole covert hart/ - 11, If Identhl debris and erosion, +•",�,, ; , s„ 010 "' ,'!, , ; 14. diameter holes subject to flooding:- ' 12.'Vary large 'rocks dumped!Ingyl .,�OverloM Flow of Flood Water e.. Bak yard garden plots are excellent channet from ealtroed sourYt ♦ Zi, use of flood plain, 1.2 fool sediment bess.igif9Q 7. Very severe erosion of outside curve of 15. Very severe erosion and amble y5.4 r is•r,ss, ®, �gn: ei^B Udb •. channel and railroad 1111, -- slIppe e'e revafed by eneyeel - enndoTreas of Dearborn street Endangered 1/.' Unique revetment of raycbd•� nw r' -�+• RMdn(nq Wall • affords some protecllon agaipel r Y1 15: 12" sanitary sewer on channel do( lecbd downstream, revalmll } , r.�.-U�Bili#'ii�`a.+rJi" %ir,...,, ;u � � s. r'+ .. ,�itL."" , ✓�`� i E i u 1 T _ II �I r�u r 1n mus �.J1Ij�' Iz DI IS ! 1/^19 41 IFd 695 LYY W� D PA Dl Sr_VIII-{{ of Topographic Aerial Photo Revisions, Mapping by Tri Slate Aero huvy grass 16. Almost 16 - 18 toot of construction debrisEngineering.-1974 Wprotectlon.r'.-' and fill dirt creole the worst example of espaciaily• . ;r flood plain encroachment with regard to +arts , consider the environment. Flood Level from HUD -FIA �q�;occurs 17. Vary wooded rural flood plain has lots of (Flood Plain Insurance) q en floor of ;rf'. brush piles and tell weeds but Is heavily Studies by USGS.•1976 li pool sedlmanl ' trrveled by children and domestic animals. �," 18:. Entrance and exit from DIPe arch are not I'Oulldings'very efficient because of channel bank fort towards towards -. encroachment. . 19. Smell pond on flood plain Is being filled fie, Of msrgy of with nsU sol 1, 50 0 lO ?00 10 A:barrIced# ': 20. Interior drainage from 25 acres be .�I. ut6'?~' ' Upland, Terrace, Court and Friendship concrete on has no storm sewers. Drainage Is on x city streets and concentrates it two curt F STREET w It... . lew.teel Inlets at culvert on Friendship. Excess when the street storm water from major storms flows TO ifow spot beyond Inlets to First Avenue and pools A'of the creek at restrictive trials on First Avenue,' SOD MEMORY GARDENS CEMETERY go of. surface ': feet north of the creek. - iutfioodwater nterlor drainage POWERS•WILUS Is ASSOCIATES LINDLEY 6 SONS ,w;ir; IOWA CRY, IOWA HINSDALE, ILLINOIS 'I Q(iSsY,�+9`xt"IIrL•�iu�"'v� ►ter '• a �I (1 ..' 4�� , 14 I y �1 H r S'A•!`YS •••'' �a l 11 kl d - x iRrw1� b;dx 4 ' 1, x r%Ira { ,. Flood area Ilmlts ers based on 4.:,Very gentle bank slopes and hiavy gra w i " - 1150 c4s cis. and ential rowth dare lsteep ent � k protectl m+ "� f i, r�• t �ycy"t ® f "' Q m commercial or public properties are ;. affected by the 100 year, piton. adjacent to bridges end culverts," con - `able erosion oras bank slippage oeeunJ C' Most of the channik and adjacent over Il 10 or 1P Inch sonitsry sewer on /foor f11 •_ � channel under bridge causes l loot se e�, ��' ,;: ,;,,Recent , �a u"L, rx'Froded ChwNl Wall , control of the City la this neighborhood' bar d ,itw � � ,� low 1 one of.tne brpest tllscrepmcles In .. bridge design by lf0 Il 1 _—•' u Sadknard NCliaral __ flood oroofing..,,, y xa�"i Fbodwoy' EnerooMnwd tSSO It 13 barrel boar culvert under, „' 15.: Bank erosion accelerated by energytol flood Want Bound s Muscatine Avenue. a discharge tram storm sewer A barricc fir qpo x S�' Very. abrupt d - 1"1001 vertical drop lav needed on alley to the south p�� ? n d a`C —` r• _"... , .,.' r� from edge of park to creek bottom. IC Sanitary sewer encased In concrete on ` " r r yr ♦S Overland flow of Flood Woler 6,1 R. O.W.;from Sth Sleet could be used a floor of chennN ^.r:= :r. 1 t� ,�wg x.: s i 61NCIurea ;,: s a residential dol I5. Fldt Avenue was lowered a few feet -;v ttouakq 1MIb 1,This9s location of U.S. G.S. ,strum 9aupinVV stellae:',: approximately 10 years apo when the s was racenstrdf Now the low ref 0.4iL� m ahT O • "gym, 30 he approximately 300 foot north of tha_cn i::''..>�a� �®ri �•�-� ► .` r,Mddrq Wall sedimentation , of i „ ssCbay because of tock of s touring water from minor storms,' but ltood'we r „tj gat r h.;. velocityIrom Jorge storms Gauss Interior del + 4Y problems which stop traffie i r t as Wig— Q(iSsY,�+9`xt"IIrL•�iu�"'v� €��AV����'�A�..l{��Lrl1 *2} L I 4 1 1 1 NOT (1 ..' 4�� , 14 I y �1 H r S'A•!`YS l 11 kl d - x iRrw1� b;dx 4 ' 1, x r%Ira { ,. Flood area Ilmlts ers based on 4.:,Very gentle bank slopes and hiavy gra w i " - 1150 c4s cis. and ential rowth dare lsteep ent � k protectl m+ "� f i, r�• t �ycy"t 2� ; ADDorozlmelely 15 resid5D and �. 10—Where banks too specialty "' Q m commercial or public properties are ;. affected by the 100 year, piton. adjacent to bridges end culverts," con - `able erosion oras bank slippage oeeunJ C' Most of the channik and adjacent over Il 10 or 1P Inch sonitsry sewer on /foor f11 Man Mode Fill . Dank areas se on R;O.Wi under channel under bridge causes l loot se FJW ,;: ,;,,Recent , �a u"L, rx'Froded ChwNl Wall , control of the City la this neighborhood' bar d ,itw }4Rlp Rap Slopi Proleeilon - ail 1 one of.tne brpest tllscrepmcles In .. bridge design by lf0 Il 1 12 •Some homes end commercial bultdinps'i ;:.; have made partial o1,lull effort toward i u Sadknard NCliaral . s shown smell „ pipe arch ands 4th Street and large flood oroofing..,,, y xa�"i Fbodwoy' EnerooMnwd tSSO It 13 barrel boar culvert under, „' 15.: Bank erosion accelerated by energytol flood Want Bound s Muscatine Avenue. a discharge tram storm sewer A barricc fir qpo x S�' Very. abrupt d - 1"1001 vertical drop lav needed on alley to the south p�� ? n d a`C —` r• _"... , .,.' r� from edge of park to creek bottom. IC Sanitary sewer encased In concrete on ` " r r yr ♦S Overland flow of Flood Woler 6,1 R. O.W.;from Sth Sleet could be used a floor of chennN ^.r:= :r. 1 t� ,�wg x.: s i 61NCIurea ;,: s a residential dol I5. Fldt Avenue was lowered a few feet -;v ttouakq 1MIb 1,This9s location of U.S. G.S. ,strum 9aupinVV stellae:',: approximately 10 years apo when the s was racenstrdf Now the low 0.4iL� m ahT ,,, 1, Muscellne Avenue bridle his P 9, 30 he approximately 300 foot north of tha_cn �®ri q toot bar n cantor and cr provides convenient drainage surfai r,Mddrq Wall sedimentation , of i „ ssCbay because of tock of s touring water from minor storms,' but ltood'we r „tj gat r h.;. velocityIrom Jorge storms Gauss Interior del + 4Y problems which stop traffie i r t as �• I Ell e • ---=sem llsi : 61 FAIN Ng �.—��;; IIILRI) '� ' •'; Ali �� - -��� Topographic Aerial Photo MappIng by Tri State Aera Engineering, - 1974 Flood Uvel from HUD -FIA erosion from on gy dissipation (Flood Plain Insurance) from 4811 diamot:'r culvert under Studies by USGS.-1976 terI then 30 feet high, provide troom bank protection. .r bridge for maintenance and service .a south pier and footIng collapse and now concrete mAu IOWA CITY, IOWA r r _.. - --�- - r ..:........... res iimits arm a. and Qln ?A 'as Cresult d r einage th cu Iverts. 4' Stream bent talk of smi doe( not off FUMM n r „5y. I Tu.d7i1:; Al* 't 1r'J !'.iti tt.l 1 'nn NOTES': 1. Flood area limits elh based on I. Excellent 0tnp • 200D cls. entl Ot • 700 cis gontly� sl - L Only / residences are aPlected ify the 11". Several, r:100 year. flood tlmlts �, . ,= w ,f,� l diameter concrete, debris In cbin nel.open'.spa ,7:rBeoken /:rSevenl'hundred smelltrees- 1 2 •tr•heblht.; Inches to diameter and 20 feet high small go protect channel bank lrom erosion 9.; Escellent S.i Sanitary sower 'Is subject to flooding, f" 'areas for er.. but manhole lids are bolted Ind , 910..,Possible gnkeled "• alto rdse 6,''LItNr from new 'home construction voterat hes been thrown 'Into the trlbuterr "4 w, of the creek. h; °1 yDrainage Systems STORM WATER DRAINAGE SYSTEMS INTRODUCTION term "storm" water' drainage system" is used to describe ,The is natural or, manmade elements which ,contain and convey, or ;swhich may absorb or store.storm water. A drainage`, systemhas two essential purposes: 1) Control of: runoff.. to, prevent injury or loss of life, and to minimize ' property damage',' resulting from an unusually large storm, n: t`and' 2).eControl of''surface water to minimize inconvenience resulting,, from more frequent minor storms. The drainage system may.also function intermittently to convey. water- from other sources such as melting snow or icfire hydrant flushing;' -'car washing; footing drains or basement sump pumps and; discharge of"clean" industrial wastes „Y1"rr Some` components of the system serve primarily as convenience:, rx des J,r drainage;of,small'"sites,-,or street intersections minor', rr^ ,during T" 1'rainfalhevents During':mejor. the capacity of; such r<: ,storms "convenience drainage" will, often be exceeded and flow capacity, must, then be provided by other; segments designated �{ for! safet � This dual,`role_'occurs ;�,""' y . in nature and can be F� t . ieconomically and',environmeritally sound when applied td urban:: r� areas x�'ll� $1f4 f 4! 1, h { k 1 r„Y k ' , ' f. '. ':f 4 •>, .{,W ,It'is'the,`purpose,of'this section of the report to provide xu�' Y: YFroCF� significant datai,=on`the Ralston Creek drainage system'and y to'< provide ;a�better 'understanding'of`the"intended function.; ;, of major components of the system.;4, , N. rioted should" -'be that' this section is' written for,Ralston. a ."' ;,creek only, although many of:the'statements 'could apply to { r ,'other'drainage'systems., Caution should be''exercised in any'° other application; roYV. ' EXISTING, RECORDS Records'for the drainage' system are essential to determine y, K"fM`r special features of Ralston Creek. Because of various rH"` rresearch tefforts,?rainfall and 'stream flow data are abundant, t;p^"d�p(; ;4`" ahereas:;3nformation on: flood damage and drainage problems as are.almost `non-existant.' A summary ,of;records and'data i isshown in the ,following table .and discussed below. „ r - , Y y� f V Rainfall and stream flow data have been collected on the I. North Branch at the Rochester Avenue Bridge continuously since September, 1924. The South Branch gaging station was installed in October, 1963, below the Muscatine Avenue Bridge. .`Rainfall and stream flow records are monitored by ;the U.S'. GeologicalSurvey and the Iowa Institute of +Hydraulic Research. A detailed analysis of flow data was ;:prepared; by. J. W. Howe and Richard Warnock in 1960 and printed by the Iowa Highway Research Board as Bulletin No. 16...Other,'more regionalized' rainfall data for Johnson 'County"may,be'obtained 'from the Soil Conservation Service. Field -surveys were made of all storm sowers in the 'watershed, locating'and sizing all inlets, manholes, storm sewers and outlets. :'Man hole rim and pipe invert elevations were obtained pat;critical locations. This information was used to prepare !Inew storm sewer maps at a scale of 1' = 200', whichare on n':the:Office of the City Engineer. These maps were used to aid in'the preparation of the accom- panying,sub-watershed map and will be of considerable value' 'rin;:future; analysis' of, specific. drainage areas.in the city. ,Some"areas were examined in conjunction with the "interim ,�,-' solutions study.: In most areas the storm sewers were .,adequate; or; too, llarge l "An,example, of'storm sewers considered too ,lar eIis,at the Happy Hollow storage site. A 24" storm' 9 'size sewer!;, this, area` at-present,''and the is'such. that ,. „stor'L:.te " ,not delayed,'; but is, very efficiently and c `rapidly., removed.' �,A,'plate';containing a 2"'x 10" opening has been proposed to ' �be:added: J � , I �. IT"� ..;1J.. I'I- - ----'- SHINGNiiiNI����J) FY1RK N 7 .'INDSOR EI S I mti; , -�i t w i i i_ � 1 _I L I _ I -i lel/JC�� i SN LHIRE 7 � r ^ �'J1— >>i � t � �>�I �•'° i BOULEVAR i y'. 1 I �u. �I L )•��-�- .Y tir ti i / - I r � I � �1 i � 1 G � E I I , J e-'-'- � -�.::I- ' , ; �I•I ;Y� � 'I 'Ii L i ai At E- - I I�IS'il� f` . �,'•� I /: n n .} 1- f;r' N PARK T., ' i j ..� r 7 .9 T. I iq : I' I:I I' i 1/ i .'t' •�, (i �� _ r. •' r I � H� EASL71 Illi „ TR T��. �B BROOKSIDE ii - SUB WATERSHEDS J U9 iATJ �1 .i _•; _J ,,I '_�.,:..-AND [— AN►ENUE777 MAJOR STORM SEWERS �D� RIDGE LINES �a -�N j R I F .moi` (- i•• L_r7 rF•• I �• SUB. WATERSHED BOUNDARIES --- ,7 Af STORM SEWCRS 1.01 -�L� RALSTON CREEK p; IOWA IL I Dls- �i GAS B ELECTRIC Mq! POWERS • WILLIS III, ASSOCIATES IOWA CITY, IOWA N , LINDL[Y 60Nf. INC. ILLINOIS 6 ' '' It lk t '01, SII/ Ll AST,:,i "all IKET I U r6n EWfIff L70 rim Along Muscatine"Avenue in the Towncrest area, storm sewers are.either:blocked or are too small and water stands in this 're''from relatively small rain storms. However, the City has designed new storm. sewers to be built along with the street widening project.' New storm sewer maps were prepared as a part of this Study „I to`:_aid in the identification of drainage areas, systems, capacity and problems. The type, size and location of all 1 t anholes'and storm sewers were located in the field n a s,,, im Rim invert: elevations of major sections were obtained ,and: `at.critical locations. This information was drawn on base maps at-'a'.scale,, of, ,1'inch = 200, feet and are on file in the office;`of the City Engineer. - Open channel length and cross section data have previously " been and studied by the Corps of Engineers, Iowa collected Natural,'-!Resources.Council, U.S. Geological Survey, 'and the - S'03'. 1i Conservation Service. Although the Corps data is the f "oldest':.(1963)'several:checks made in 1976 reveal little '. change•in`channel geometry,in the older neighborhoods. Additional' cross sections and`bridge.opening measurements r,? were'made`in this.study:.to confirm earlier data. Storm water runoff is flowing over land during and Yw,i, T,jrt, ,water M1F immedsately,;after a'rainfall. Runoff can be in thin ,'iaheets,ti but usually -does -:not travel' far. before being con- centrated- 'cis" a'small'stream.' The peak rate of runoff requiring transportation or storage is'a function of: S !The upstream' area being drained ^` '.. lA t � A' (1l Y4 1.��, I l 'rt: .. .. • B. .Infiltration .: Yin C The shape`, and slope of the watershed �+ D. ;The amount of depression or vegetation storage 'available. The- 'mos t effective'way to reduce runoff from an upstream area•isr`.by„storage..,,.This. topic will be discussed in a subse uen q t.section"of this,report. " tt,t Mand use,;: soil types' topography and antecedent conditions,;> , :have[ a,` great deal to dorwith:reduction of: runoff by infiltration ;'Flat lawn' areas' in sandy soil may have 0.2 Rs inches',of:`runoff from a l inch'.rain, while steep lawn areas in,clay'soil will"produce twice that amount. The ,runoff from a residential area: may be from 25% to 75% of the' rainfall.''Paved surfaces will yield y practically 1008 ; runoff 4pt3� y'. q y i As farm land adjacent to the City is devel:ped for urban use, many of'the steep hillsides will have homes, driveways and streets. The effect of constructing storm sewers, paving streets, and building houses not only reduces .infiltration and removes small surface depressions, but also makes the surface smoother. With less resistance to flow anda more direct path downhill,runoff'- under an "improved" urban drainage system, is speeded up. The result is. greatly increased stream flow after urbanization for the more frequent rain storms. Runoff from prolonged heavy rainfall is not reduced much ,,".""�,-,''�by,3.nfiltr,6tion or by small surface storage, thus there is ;less'difference :in runoff between ,"natural°,versus ."improved" urban drainage systems for large rainstorms. Although the overall size and shape of the watershed is .the effect of runoff' concentration can;be minimized by; land use; practices which increase .the length of :travel •n for.. runoff and decrease the slope. Rural land use; practices include;;,contour .-farming ;. and terraces. -Urbanland.redevelop- ment;;practices:'would'include terracing residential lots and locating streets.in a, curvilinear -pattern parallel;to thea. contours .'Much of the recent residentialdevelopment on the p¢" South` Branch has been contrary to this concept; with "roller ; v The„ Friendship, Raven, Clover area is a F ,"c`oaster"`str(ietsL wI good:'e)iample'of parallel,,curvilinear street pattern which, slowscrunoff ,:Immediately; across the; Creek on Alpine and :A Juniper?'Drive,.is an example of street pattern which accelerates a runoff TRANSPORT. Storm water: is moved or "transported" by gravity. and is F,yti' +carried.in openings of various sizes and, shapes, against the resistance`. of surface cover and other obstacles in its path. Some,people,say all.you need to know about drainage is that e* !'water,runs.downhill.": Those who laugh at this statement because "of''its'simplicity must recognize the; serious w pioblem,:which.results because. 1. is a relative and'd ny auric":,;direction-;and is:relative to the" amour water -' •'being transported.., "Downhill" for aj.flood ;often 'is not the _x'14 N'same 'aw!!for, convenience drainage, the difference in path y may, be'only a'few hundred feet, but the resultant damage baJu, may, be 'extensive. •n r• c: The table below lists several points along a typical con- .na venience drainage path vs. a flood path. Frequently Used occasionally Used r Convenience Drainage Path PathFlood Drainage Path Roof .Top origin Roof Top Lawn Lawn J `u' 1 AYafi Street Gutter Street Storm -Sewer Inlet Ralston Creek . Storm Sewer Lawn i+t Ralston Creek Basement U ... Iowa. River Living Room Destination fi r ','Downhill" for the main channels within the developed part of;the.watershed'is shown)on the accompanying drawing - *'r r ;Flood"Water Profiles. �ra�':,. ; �'. , ,Slight„ irregularities in. the channel bottom are, of no _major r ,y consequence in evaluating'.fiood'transportation=except,where, F' rA s Y the:; bottom rises' at+a. bridge site or: at, a constriction created by'a utility crossing, as was the case with the minor, modifications-'recommendedJn the interim Report l y x which is on file with the. City. s, The, slope of flood water surface is a very important ;the indicator„ of the energy gradient, of moving water. Both Nyy Y thet107year and;-,100-yearq:flood.water profilesare shown on the.accompanying.figure with reference to the streambed ; u;•and various street -crossings. ;xa'g2 wA "b in the` flood water surface are the ,b Ther unps" .profile; ' ` 'result of channel 'or bridge constrictions. Where the 100- ! ;.year ,:profile ,is,;relatively smooth and a few feet above the .. roadway; -;;little, resistance is caused because most of the tr' +water is going over the road. �� k i i AV, The;;big drop at, the Kirkwood Avenue Bridge.is channel scour hich is,,,slowed'by;, concrete and rip,..rap'protection. The y flat segment of.the profile near: Highway 6:is caused. by back'. water from;the Iowa,River which has,a local effect on flood s levels. �,r ,��'JNY • .na r J `u' 1 AYafi l.n . The relative area of flood way which is available for transport, decreases appreciably, from the upper to ,the lower parts of the watershed.In the rural upper watershed, an unlimited floodway is available. In the Friendship area, an adequate floodway is available, however, large floods may cause damage to Iadjacent low properties. Encroachment upon the flood- way along the lower reaches of the creek results in extensive damage during periods of flood. See sketches page 40 and 41. In the Rundell Street area, the stream channel was relocated when the area was developed`in'the 1930's. Now when flooding occurs,';the channel' capacity is not sufficient for transport �I and flood water spills over the stream bank and flows over u^: land 'back to the original flood way. In the Iowa Avenue area a' similarlcondition',exists where the flood way is; disconnected from the stream channel. As a result,'flood:'waters which cannot be transported within the channel,;:spreid'out over,a broad flood plainlcausing con7. siderable damage. order to significantly increase the transport capacity 'In of -Ralston. Creeknear Friendship ,from,where.damagebegins Street to the Iowa River, there must be either: ^ A� Amodification'of the stream channel or, modification of the flood way. Gk: .The`stream;channel is in a constant state of.creation and " de'struction by:erosion" sedimentation, vegetation,` con- struction,nlandfill,and trash. For the most part, however, °i steep and bare. : The•'top of the the' stream banks are ;very, p stream'bank.near the'channel;is lined with a'variety of vegetation from.weeds,oshrubs and small trees of many spec iesi.to.large.mature'trees." ;s The bank`; slopes., are of ten,too'steep to be stable.,•Without W, "vegetation, the''steep;'stream banks continually, slough into: ..the channel. 'There is:evidence of bank erosion everywhere, and land`ownersl.have tried every kind'of home remedy for erosion:�;,,Retaininq.walls or:slope paving have been, used . (� for.short'distances where intense land use has encroached on ll'. the flood way. -' It is clear that any major reconstruction of the'Ralston �- 'Creek channel and bank will require:- A Considerable effort to remove vegetation. AN =„ B. Maintaining stability of new stream banks. v 1 �y1 nays = N Flood Wafer Surface m rc W ®Q100.2900 cfs N U W J Flood Water Surface u 'B 010. 1150 cls Su DODGE IST ® f®�l�llillllll �■ II■■■il�Ti��lll�l�f l�r�■ r'so / Ir 8, 67 r Q75-.2 F � A N� 3.5 _le. .... . .. Q10 cl000 cfs I I 'm ir r -------1 675.0 Elev. - Ottai Ch 3nnel r'so / Ir 8, 67 r Q75-.2 F AVE' 176T;T SHERIDAN ? Q,00 = 2600 cfs 678.5 Elev. � A N� _le. .... . .. Q10 cl000 cfs I I 'm ir r -------1 AVE' 176T;T SHERIDAN ? Q,00 = 2600 cfs 678.5 Elev. Q10 cl000 cfs 675.0 Elev. - Ottai Ch 3nnel Floodway FLOOD LAIN I 10 7N:Q' 900cfe ,yz C. Expensive measures to re-establish erosion pro- tection. D. Successful public relations with land owners. E. Acquisition of land rights for construction. n the R and from Sheridan to undell and Iowa Avenue areas Johnson Street there are hundreds of homes and related improvements including:garages, tool sheds, fences, play :equipment, gardens and landscaping which make',channel expansion difficult. Abo ve and below these locations channel improvements could be made with much less difficulty.. 2.11 it is of little value to provide sufficient area for transport in the stream channel or adjacent flood way if the :,resistance to,flow retards or prevents the passage of water. Res is tance :to,f low In a.,floodway is caused by:, A. Roughness of channel bed and walls. B.,'�.Dense,. young, trees, brush, fences and structures. 4. svl� kms;1 C` Abrupt' changes in cross section such as at bridge penings 0 openings ;Suspended utilities or small openings which cause „,;' debris to collect. inter and early spring the Creek banks and overflow e,�relatively,clear'of,weedS1but small treesiremain'. , In' summer;, the''� gro%,?th'of , grass, weeds and brush, cause, a_ severe restriction td' flow in the floodway. Selective and removal of trees and brush on,the channel walls and inthe'floodway 'would be useful in reducing flow iSeveral street crossings have small bridge or culvert open- I , . Ings :; In most cases the 100 -year flood and often the 10 - ar!flood waters go over the roadway.;: It is not economically Ag. f6a i ible toreconstruct t briges or,: culverts only. for reasons ,, 0 -improved,drainage. Information on structural conditions, ij,l r� �1 g t iifficshow need for,some' � 2, 'the �be,-replaced. a� $z STORAGE %,t`, Varying amounts of intermittent storage occur naturally in � depression or on wetted vegetation. In many cases this l storage is caused by natural or man-made obstructions to 'flow :oausing backup water to spill over into adjacent low areas. ", This frequently occurs where a roadway crosses the channel q Y Y �.' 4"`arid the culvert or bridge issizedfor low flow convenience r5,?; drainage. L Wy3-,`'Storm water storage has':several important functions which 4z L include: L� A. Reducing and/or delaying the peak rate of runoff, + thereby permitting downstream areas to drain xFTrq without flooding. B. Reducing.the frequency and severity of downstream r'yti, flooding,,erosionand sedimentation. - Allowing upstream areas'to be developed without increasing the impact of flooding in downstream areas W '-M6st,natural storage sites are even tually lost by urbaniza- E4M tion ,.Although r:these:sites are usually small and temporary,: rnrn i ?r ':,t -e,3,. storage.s'significant.' The,:Storm Water W� Managementiordinance,adopted bythe City encourages retention 0. a� of natural storage areas. 1rtxL, �•}�I k<. nild3 tNYlua.gi�l h.J.. _ ., .. ": "General criteria Por the"selection of storm water storage indludes the following. A Current land use:must be relatively open where 'potential "damage from'flooding will be minimal. W B.. purpose land r s:should be'provided to aW3 ,Multi assure neighborhood acceptance, and reasonable !; development costs. The site `should be essential to downstream pro- tection -D.1'.,The, anticipated should be greater than ..�. ;benefit costs. , a. Specific criteria for the selection of major'storage sites include " A Locations where dam embankments can be economically W4 i`a constructed, such as in a narrow valley with steep ' hillsides. ,i '4 Iter I B. Selecting locations where the storage site will h control runoff from,a large upstream watershed. ,ty Selecting locations which are politically as well =F M l as economically feasible. x7 D. Selecting locations where a sufficient quantity of suitable. soilis available for the construction of a stable embankment. 1 Additional criteria for', the selection of sites intended for permanent water storagelinclude: , .Relatively. steep banks. in upstream pond areas to ;..,I control growth of nuisance weeds. 4 rx B Control` of sedimentation and livestock wastes in upstream, watershed to minimize soil and nutrient •m tv v Ip011ution. R� C Location where ground water or base flow of surface; r: x1 zA r. water is: adequate to minimize effects of evaporation ' 1I s{fiW , b lllYltl ,YQ ^ losses ' Ylri p 'T f, r 4 Site must hold water. '. (Soil must be impervious) Need,`for-i impounded water, for recreation or agricul turaltwf�' 'kik f• x�I�k+c�a i,'P,T Y .art f 4 1 � ',rrFA t&k• Lhno-, us+.f � a ry r, a i w I hwip N r ! IIe.ry r'^y TAM,C.L..i17hr1"PLP.y� S. jS4�Alk. nP^nr (Na{� rr w)v „x . 1i. , •<t Y.S lY11�41 �5f Ufh ! \'r rfl 4' li�ti I � z, u ` tit5'"` L rE115FJ, 1` r 1 1 ' •! rr{i yiJ.ri�i�4i 1pVt rL -<L't v _.✓11�, y ,' �. aril 74ril i' iVit� �f "ftH vd'hr1 ..G ` 2 ,v , 1 , f r,.,rrl Inc p I i"{4 r ;1yj 1'iradM,O =�t�,v�r tk:{t�rl �•'. �! �'.oM'i�l �I Several potential storage areas are shown on the accompanying i i map. Some of the specific characteristics of these sites have been tabulated and are presented in the accompanying table. ='.SANITARY SEWER SURCHARGE Surcharge and overflow of sanitary sewers causes a signifi- �cant:problem along Ralston Creek. Following periods of intense rainfall 'storm water enters the sanitary sewer system.,. The combined storm and wastewater flows often exceed' " the 'capacity 'of°trunk and interceptor sewers, some of which are ;located intbe low areas along Ralston Creek. The excess flow causes surcharge resulting in backup of sewage into basements or overflow onto streets in low areas. 'The consequences of sanitary sewage in basements may include losses 'to building contents by water, and sludge,damage to ,N 'mechanical-.andelectrical equipment, damage to furniture, yy household goods or stored materials. Hazards,,'to public health and safety exist as a result of a �ey�,, !.accidents incurred while hurrying to prevent damage or during clean: 'up: activities;.contamination of water;: supply; odors,;Vnuisances and contamination of foods; long-term ftj�, e1"' effects on mental health and anxiety. Maxi.:. ... Pn .�tSewer backup may also cause economic losses from out-of- ut-of-pocket,00sts pocket, c6itsfor building repairs, goods recovery or "t replacement, loss of income or productivity from time off Iiia works ani lower property values and tax revenues. ,L ; ii, ;y ,, o e areas where sanitary sewer, surcharge problems occur at present are shown on the accompanying map. -Like the flood prone !' }'r `area,: the impaot area. is only;a fewhundred.feet wide at the end but'widens in the Rundell Avenue and. -Jefferson � ,;upper, *, -Street neighborhoods where the topography is relatively flat. t`Severa lrhundred,.perhaps,as high as 1,000 residences and 0k:rr' commercial properties may be; affected. Homes and businesses in low areas most affected by surface a water,;,flooding,often suffer damage from backup of sewage MR, in basements. i 4 -A i ask a veZ t p 43 e x ' wW4 POTENTIAL STORM �Hri{ First,Avenue undeveloped { uNi Y a,r4, Croe kside, Park, South N.A. Agricultural, residential, open' Court Hill Perk' space, commercial 4t, Ir44t[ j N I ( .:SJ �rV h'4y4h S� Ihl 4i 4'4'I ti%AA`e2'G�ihW s � ii���11.•iM'i ,YT'w �rci lV�_. I,:',., ,. .:�\, .Ft +f}'... .1 . vi: r ., .. if .... � ^ r �, .•+,..�+n rea Area Name Branch Controlled Watershed Characteristics Happy,Hollow Main 35 acres Residential, office, open space and playground Highway 1 - North 50 acres Residential and open space --r Hickory Hill - North 1900 acres Open space, parks, wooded and agricultural land `r N Scott Blvd. - North 840 acres -Primarily row crops, agricultural `{ sediment problems 1 y 'S Scott Blvd South 940 acres Agricultural row crops and grasslands w L. with sediment problems rv} ,` , q r South 120 acres Now agricultural lands probably soon;; +, Y Q�sA;rresidential 41 M4 W 4 lJ Soots Blvd',,- t -5� 1.' Iowa -Illinois South 80 acres - Commercial/Industrial and residential .rte lj�v ta'� t(y,Y�41 ..,rne ayf lel f I � Lower, West Branch South 265 acres Agricultural row crop and grassland ,) with sediment problems. 1 ' M1'. 4a r M Q,1 +1 IY A 4 1 ul ,'.I. ., f:'., 1, J ' ,, F T V Y_✓.are Mil P! k.i ! 1 ra,«L.' ,• Long fellow.School , South - Public playground, recreation i {� �Hri{ First,Avenue undeveloped { uNi Y a,r4, Croe kside, Park, South N.A. Agricultural, residential, open' Court Hill Perk' space, commercial 4t, Ir44t[ j N I ( .:SJ �rV h'4y4h S� Ihl 4i 4'4'I ti%AA`e2'G�ihW s � ii���11.•iM'i ,YT'w �rci lV�_. I,:',., ,. .:�\, .Ft +f}'... .1 . vi: r ., .. if .... � ^ r �, .•+,..�+n )rhood' !:I 'icinity. Available Resources Benefit to Flood PiuvenLion Lal & City owned land, embankment & Primarily significant to local ;d• drains partially exist drainage; cumulative effect on Ralston Creek n Lal, Road fills,.drains & steep Cumulative effect on Ralston r :; hill sides Creek - provides protection to LIi Hickory Hill site '. Iasidential Some land is City owned; Major benefit to Ralston Creeki t abundant soil significant reduction in down- stream flooding n , Steep hill sides, narrow some benefit to Ralston Creek but valley, abundant soil less than Hickory Hill because of distance from Cityi'protection to Hickory Hill site; possible rural water: supply or water recreation - benefits a?. La1r,Streets ,''Steep hillsides, narrow Major benefit to Ralston Creek n S ce + v ,. pe pa alley, especiall 'immediatel downstream y Y ps ,abundant:soil but. also in Rundell neighborhood O Lal; Streets, Probable developer expenseSignificant benefit'to Ralston 6 uamerciali Creek; very, important to area immediately, down stream Commer Railroad ambankment1 some !. Slight effect on Ralston Creek; ' Q )pem'Space =; control'over, access'to Reduce flooding immediately down- njy flooding site stream "area, 'road ricultuzal Low swampy., Protects South Scrott Blvd. site Roadway embankment' from sediment and brush; prolong life'and capacity of Sr Scott I Blva:site. y,+. Lal Low. open Brea with partial Minimal individual benefit to Ralston G " or"full embankments Creek; cumulative effect. Lel -open space,', low area,with Cumulative effect] provides some pro - partial land form for taction from erosion by fast current storage �k, jA �, S '7 '- ��,>> rte,, • ' Rte; jVA r SC JJi ��A I' vrJ � � ����r� `� ��t � �7 �I 1, � Zr•� � ; w `�,.' �u5 l� j ,% ri w r✓e ANchG% J sic ,,I LYy q \i %� •` 5 \` � �t ! ll�'l"!' � / � `t'�� I . SCC C'(�r� �°: it-, \C' l` POTENTIAL bLLE h �S�IZ•>;'' c STORM WATER STORAGE SITES CONTROLLED. y„J�---+- 1""•-I )) r�` UPSTREAM WATERSHED r I ,� 'r•\—••� �,.,,,/ . Jam_ 1 .,'�^-�'-"""""•�—.. ,RALSTON CREEK '•' k� �1� `�. RIDGE LINES 16 POWERS WILLIS 9 ASSOCIATES. / IOWA CITY. Iowa AND ♦/ /'- °`;tiYe('�, LINDLEY d SONS . INC. HINSDALE. ILLINOIS y� 21 1 I ✓C% \I t. ., s 14 I .. t " arl g sch Y ,j '! In simple terms, damage occurs because more sewage plus F infiltrated storm water is transported to those neighbor- hoods than can be carried away by the storm sewer system. x� Attempts to minimize problems with sanitary sewer backup in basements are listed below together with possible results; SOLUTION POSSIBLE RESULTS Plug'floor drain a. Works for low, surcharge , b. Increases hydrostatic loading c. May cause cracks and failure of floor d. Plug may blow out e.Basement plumbing fixtures _may,;. :>i overflow #' �Z +y4,1*tit Kibfin^ t 2' Riser pipe in floor drain a.`Minimizes chances of basement 4 �"4,��'� flooding �4 r pump, for basement` i plumbing a. Satisfactory if gravity discharg for first floor plumbing is above sewer 'surface elevation b,:�Increases power consumption c. Stringy, solids. or grease may', " clog pumps . x.� rG���,'ilttl ' j91{j,6 1r 9'a Il . r ��r?htia 4v 4 No basement plumbing a. Need to, pump drainage.. f arL�F 5 No basement a Only reliable solution V. 0 16;h-11 Y�IL , ti.` .'..i .. ,hsF" t t„ >s Inf addition'; to basement flooding `automatic bypassing. occurs when the pressures` from'the surchar ed sewers g pops thelid off �F'xr�?z,yyr;`; ', manhole• Induced,, bypassinge does occur when city crews pump Y r r frPd4`� , '3 h, sewagen from,: manholes in an attempt to relieve .surcharging ,conditions and prevent the back-up in basements. In both "> g ,,cases;',the sewageitsIreleased`into the streets and gutters. Gross„ sewage solids- originating ins the sewers are left after the bypassing is discontinued and must', be washed'from`.the streets with fire hoses. The sewage poses a significant health ..'; r. ?A:I�Srw'�r 1 Y t '�'✓FtJE'T liir',-,.%fid p 'cin (l, ,` � t :' hazard, not only before is is hosed away, but also by, the lingering presence of pathogenic microorganisms not removed by the washing.- -` Clear water can enter the sanitary sewer system in significant amounts from two sources: " 1) Rainfall ,. 2) Ground water Rainfall and runoff can enter through such direct means as roofdrain z connections, holes in manhole lids, area drains �! ,and',storm sewer cross -connections. The impact on the sanitary ',:sewer,, surcharge, conditions is severe and can be seen almost immediately after the start of rainfall. A more delayed e'ffect"occurs'when rain 'water Percolates through the ground ' °,near basement footing drains which are connected to the sanitary, sewers. More infiltration enters through broken n or, leaky 'sewers or manholes. U1 Saturated ground conditions can occur.anywhere,in the water- n ° shed where;_the,soil is relatively pervious and infiltration U' surf ace '.'Pooling is occurring. �iryPit 2*,<<Several new sewers have been constructed recently to alle viate the.• A 'new extension was completed in 41968to " 968 to`relieve overloaded:conditions.;lin the 'eastern part of ; ;the'City. ;;'Bypasses' south of Upland and Westminster were installed in' 1973 -'to connect with' the new trunk line. and h rel ,r...elieve . , rsurcharge problems in the Friendship and Court Hill e thei ....• t° " 'Although se'tiurk sewers'have lbeen helpful,surcharge } ,�•4 �, problems;`still. exist.',, --,.:The new -trunk sewer was: tested l the"1972'flood''and'several,•residents in the Friendship and undellrareas,still,reporte&,basement•,,flooding. The:Upland venue:;'bypasa_has'not:been'thoroughly:tested since no large storms have occurred since it was constructed in 1973. In the-, general vicinity of Scott' Boulevard aad Ralston Creek, F the' Public. Works'Department eat imatea approximately 16 acres' of undeveloped land for; multi -family and' 257., acres of16undev6loped land for single family use (approximately 1x00:persons)'may still. beserved by, existing sewers during 'However, normal weather" conditions. the additional load 4r "'will certainly increase the frequency and severity of a rcharging sanising problems in extremely sutary aewers,cau wet 'weather , �`✓,gra ; � : � j•y .til '' �i tt �% I rr i I i I - ( r.aTa!'�.d...•W r6{v,�ef�l";'rg•...,_p+y _ ... I it µ �!I IIi11+ ia'/� i I r • 1 ' 1t y 1 I �1 II I I •I 1 7 I: FLOOD PLAIN 9 SEWER SURCHARGE AREA 100 YEAR FLOOD PLAIN R.a ❑ '7" { !1. '.I I 1' SEWER SURCHARGE AREA VYI - 1 �I; p POW 1 ,• ,' ; , ~� l�) .:. i 1OY;'• Ink • CITY, 0 ASBOCIATCB LINOLCY I6 60NBt.- - INC neo a wro < 7 J. IT R16 uljur"ff, sE . . . . . . . . . IFT oil k V I I In. nT-iHM Al 1' NiftiMyT% I air 11 Zi I" I., . .... ..... il The of continued growth with increased damage to pressure downstream existing users will undoubtedly require either: 1. Rehabilitation of the sewer system, or 2. Construction of additional capacity, or r 3. Restrictions, on land use, or 4. :-Floodproofing,and plumbing modifications to Protect those downstream. a in anp_event, this'isla significant problem area which n' requires attention, in, the development of the plan for watershed improvements. nn r 1 r W 1 x�{�Ji ifla'J!1 t Y SI 1 1'. i rr� 11 ggr n A 4 T {: I+ k 1 I I \ 1 n yt i� ArY 151 A 4 ..i 1 rjI 1 t:) .ttG I r I 4 4xt I -rIF } xyy L. L i� I nt tl h t .y v 1 �5+f' i 1 14 W v� I1:11 PhysicllA Utura k., eFatu IGl 1 res + NATURAL AND PHYSICAL FEATURES GEOLOGY AND SOILS generalized section of the soils and geology to be encounterde ..in the Ralston Creek watershed consists of surface soils, aoess,.'glacial till and bedrock. The importance of hese components4 to ,the, problem of flooding on Ralston Creek lies 'in',' their` -ability, '(or lack of ability) to resist erosion and "-j sedimentation,'and to allow percolation of water, thereby' decreasing: runoff. The. -surface soils of,.the area are of differing kinds and represent a.very"complex arrangement,, the details of which are ,far;•beyond.the'scope of this study. In general, the Yf �surface'soi1 is predominantly. Fayette silt loam (788), Chaseburg-Nodaway complex (9.58)„ and Iowa silt -loam (88) These three', soils cover: over, 958 of the area. 1 The'upiand soils are generallyiwel1 drained, of moderate permeability,; -with a;high available water content. These'`<,+� characters.stics`make.,:them ,highly desirable for agricultural,;, ; a3 a 3� sproduction,;but>also;contribute to their ability,to.produce rr G runoff during rainstorms. "Loess''deposits ,can be as much as 30 feet thick in the upper portionsp:of•the,watershed. ' Loess, is'a deposit of relatively.sacr rr', uniform,.wind blown, silts and fine sands. - Because of the ''fine:p particle''size, loess''soils are. highly susceptible to -erosion" k in,an' undegetated;state. In the natural .condition, ,loess - r > ,,•, has a, relatively loose structure,with numerous rootholes, which contribute''. to a:hi h'permeability.p '9 When'di"sturbed'and compacted,'loess can become semi -impervious; barring: the percolation of water and increasing runoff a ',potent al. Cr �Glicial-tills underlie the loess deposits and are a.miscellaneo mixture sof. boulders,. sands,, pebbles, and clay size particles,wr;; 1- ;deposited up'to 100:feet,in'thickness by'the retreating glacieri some, of! the''lower'areas 'oflthe 'watershed the creek has' erodedithrough;:the loess and exposed the glacial till These tills are normally quite. pervious and water bear ing, lwhich,.:;+,• contributes o!;a quick response of ,the water table to heavy,,,--!"-,, rainfall and results in^.groundwater pressures on basement '«E, foundation walls and sanitary sewer pipes. Y' The'tills are 'very suitable for placement of structure foot- ings and foundations. Their pervious characteristics require detailed soil investigations before the design of any water holding structures near such layers. i 'I Bedrock underlying the glacial till is the Cedar Valley limestone .of Devonian age. The limestone mass has a rough 'and undulating surface, the result of complex erosion during .'the,.pre- glacial period. Many water wells in and around Iowa City obtain water, from the Cedar Valley limestone. ' EROSION AND SEDIMENTATION Deposition of .rater-borne particles takes place when water velocity is reduced':and;the transporting ability of.bhe flowing. water becomes insufficient to carry all: of its load. ?The result is`..!'sedimentation." All sediment has its source in erosion of one type or. another. topopgraphy of the watershed is from relatively flat to yam. rolhng,to hilly.,-Erosion,,potential of surface'soil can generally be classified according to slope: 1 1 illl 4 j • - �,�+Slope , � �Erosion Potential 0:1-15%.--Minimal sh 58 98 ' Moderate k; „ � � Over" 98 Severe` '"Sediment is `an inescapable companion of flood waters and'in most nstances,';Idamages_the.area where it is;deposited.,.>It buries`lawns,'fills ditches,;clogs stormsewers,' culverts and r t°„Jfs y �a drains` It'leaves:flooded,houses.land basements at mess,: both _ .. while;wet'and,ifter,the,water has evaP orated. It, pollutes .y__. streams, rivers, lakes, and ponds.` Sediment can carry with to it•pesticides'; phosphates,'.and other' chemicals' and lowers y'y hequality of water for municipal and industrial uses. �O �44�%Itlr %1 1 \: ui fA An understanding of the-process of erosion is necessary as a ,basis; for: planningradequate sediment control measures., Erosion •is an,`ongoing process. Normal erosion occurs where or from las� ve SThis isilt thatrhavennot beensdisturbedsbyeman. rclassifiedock �”`"`• �a " o "natural ersion", and man has little or no control over.it. Where"man has `disturbed the land by construction, farming, !i or any: operation that removes the natural protection, there may,'result a`sudden,:large ';'increase in soil erosion. This + f=,�� ,✓ sis called: !'accelerated erosion," and man is responsible for, and `has' control over it. ., rl�rl, •,r�N - 49,tik,; n I The process Of soil erosion consists Of three principal steps: The loosening of soil particles by the impact action of runoff. of raindrops, or by the scouring 2. Moving of the detached particles by flowing water. 3. Deposition of the particles at a new location. ..... ... . . .1 Thesesteps occur in sequence from ridge to river in any watershed.. and deposition of soil particles depends The rite of removal upon. A. Intensity and duration of rainfall. Vol=6 and character istics of the water flow. B. C. Soil properties.. D.So conservation practices., 000tons!lof.'soilmay be, eroded'from,a, square '::mile of deveioping area;during the construction,period, but ach'sediment a iso comesfrom. agricultural land. Studies M" d,farmed.in row. crops. 20 have h t;'6rosion in,lan shown,t a r. u 'a ",times ;greater thanonland,in pasture, and,200 times greate than' 8wland'-in timber. ' ' 'of IO%'.va, city, is preparing guidelines� for erosion yr7 ;The'City andsediment 'controX• f or'construction siteswithinthe City. This will be added to the "Design Standards:for Public in Iowa Ci y and will be available at the Civic. Works - Center Jri;'la, �i' Zvi 1 5 1�1411 4- !1' ASSESSMENT OF WILDLIFE AND WILDLIFE HABITAT INTRODUCTION'; InJanuary` of. 1977, a report entitled "An Assessment of Wildlife and Wildlife Habitat in the Ralston Creek Water- shed" was: presented totheRalston Creek Coordinating committee and is on file with the City.' Because of the detailed nature of the study, 'it'is not reprinted in this report in its entirety, but is instead, presented in summary form. rr't The" report 'was prepared by D. B. McDonald Research,' Inc., in U?' cooperation with Powers -Willis and Associates and Lindley and Sons and contains an assessment of wildlife and wildlife ` habitat at,' seventeen specific locations'throughout the �! watershed: It must be,recognized,that this assessment isnot intended to:, n' „= provide'a complete analysis' of each specific area, but does provide,'a'general ':overview.,of the type;;and qualityrof:wildlife •.<' iru tgand'wildlife;habitat at-.various'_locations..It".is'anticipated(? e a thisstudy will'provide valuable background information �for..future"s tudies, which may,,be necessary. s study presents': the results' of a detailed analysis of terrestrial""and 'aquatic wildlife habitat conditions and relative wildlife populations within the Ralston Creek l.r ,watershed iYi• it 4. e,'assesmment of;wildlife,and wildlife habitat,was undertaken 3 wstl particular regard given to"the effects storm water ,r}A storage':would have', on'this ''aspect of'the environment. The " magnitude of impact, both•'beneficial and adverse, has been assessed to provide an insight into any necessary environmental ' trade of fss relating to storm water. storage. N- In conducting the.- study, various sampling stations were a„ selected throughout'the'watershed. Ten, stations (or sites) p+ii are,,shown on the accompanying ,numbered,l..through,10,,(which :-map), were, arbitrarily; selected in the quasi -rural areas of 7Y " the'-Ralston'Creek<basin`for the investigation of terrestrial r, °wildlife:,'and,habitat .,Seven stations,for the evaluation of aquatic -:conditions:; were selected<'and are shown on the; map q -, 'as,stations':,11 through 17 -These sites are representative 4 ' 'areas, which would likely. be considered for storm water ,of storage facilities: Ell, f WIN VON ^1, i'%t ✓e� kv Com• (���-^�� \ .r Ly�•J�(/ I. ll r f/ � • l r��� eg- Ic it It ` \� lti��,^ / �) � ) rte..) � •\) \ It J' 1 ,. J �`{�� I l's, •vim �� 7 ; 3 Ir y ,, TERRESTRIAL E)� ` fi EC - AQUATIC �V\•� STUDY AREAS .� fl .�•-�'^-�.,_„ . V f� STUDY AREA NUMBER POWERS • WILLIS 8 ASSOCIATES IOWA CITY. - IOWA %U - .. AND -� LINDLEY 6 SONS. INC. 1.. ... ��ILLINOIS HINBOALl. '.. .rt I /I xoWtx �r ^ W // Wr• I•N NN YYYY. NM Jhj%, PARK� IrMilaffiffiffilbi WMEW."q am St i In general, the overall wildlife habitat in the Ralston EXISTING ENVIRONMENTAL CONDITIONS 7. At the present time approximately one-half of the total land consideration must be given to the fact that conditions were area in the Ralston Creek basin can be classified as urban, .measured:for;,a'wide range;of indigenous wildlife species with . while theremainder is agricultural or rural in nature. _. a` broad spectrum of habitat requirements: :Upon afcareful Topographically and botanically, the area can be categorized analysisJ it becomes,, evident that -for ;selected; species,.,; as original rolling or undulating tall grass prairie, pheasant,'„ rabbit,', certain'' species and small mammals, , grading into river bottom land features along the Iowa River. !j6, habitat conditions ranged "from '-fair to good at'most stations. Due to man's influence, most of the native plant species In` this; respect it is'likely that;, the relative pheasant and have; been replaced by introduced plants or culigens - rabbit'•population`in the : basin :are equal to or`perhaps only primarily born and soybeans. Likewise, some physical Yslightly; below, those"reported, by the Iowa. Conservation . features of the 'terrain have been heavily altered by man. :''Commission'°'forlEast Central Iowa. While no positive evidence In.the eastern.and northeastern parts of the watershed, which ,. of;;quail;populations were,noted,'certain habitat association are,.generally rural in nature, isolated remnants of native appeared;,suitable to sustain a modest, quail population' vegetation and natural terrain can be observed. for: quail would be geographical ,;',;'Probably:,the,�contioliing'factor, —range'._and;human disturbance as well as the effects of •TERRESTRIAL WILDLIFE AND HABITAT In general, the overall wildlife habitat in the Ralston Creek' basin'has'been,judged as only poor to fair,.:however, consideration must be given to the fact that conditions were .measured:for;,a'wide range;of indigenous wildlife species with . _. a` broad spectrum of habitat requirements: :Upon afcareful analysisJ it becomes,, evident that -for ;selected; species,.,; pheasant,'„ rabbit,', certain'' species and small mammals, , !j6, habitat conditions ranged "from '-fair to good at'most stations. In` this; respect it is'likely that;, the relative pheasant and rabbit'•population`in the : basin :are equal to or`perhaps only Yslightly; below, those"reported, by the Iowa. Conservation . :''Commission'°'forlEast Central Iowa. While no positive evidence ,. of;;quail;populations were,noted,'certain habitat association appeared;,suitable to sustain a modest, quail population' for: quail would be geographical ,;',;'Probably:,the,�contioliing'factor, —range'._and;human disturbance as well as the effects of i`- domestic`"predators.' ,, The" highly: mobile: and adaptable raccoon could find suitable. habitat '"conditionsat most stations throught the watershed. '.Relative;abundance.of this,species is, probably fairly high. Like wise,'.skunk and;opossum, while not. as mobile or adaptable,': q would'fine:fair, habitat ,,conditions at most stations. , i Squirrel populations, fox:_and gray, are definitely limited by,tlack of habitatquality:'.throughout^most of the basin. The ..;.'exception,-:hbwever,',would ,be': station 9 where: conditions`;favored ;,both, species. Considering, minimum habitat conditions,, fox squirrel, populations are probably equal to'those"reported by" fthe�oclowa;Conservation Commission:for East Central,Iowa'., The ,,."lack,'of sufficient: areas of suitable habitat for gray squirrels - even at station 9, 'probably places the relative abundance of this;.species;.below areas with larger areas of equivalent i' -habitat. '' l i•M yl Iry �f I vl i I The controlling factor for both species is probably human disturbance and predation plus competition from raccoon. IJ; While habitat conditions for prime predators - fox and mink, zi are -favorable at some stations the external factor of human disturbance greatly reduces the probability of these III species being more than minor factors in'the wildlife eco- systems throughout the basin. �?I Habitat conditions for a wide variety of small mammals (mice, moles, ground squirrels, ground hogs, etc.) exist at almost all stations throughout the basin. 'Thus abundance, of'food probably, sustains the limited predatory furbearing 1 population.,, Waterfowl useage of, the basin consists only of utilization of crop, ; fields 'during'migration 'and reflects the proximity ' of,"the Cora1vi11e:Reservoir. It is highly probable that Wood Duck resident: species,, utilize the nesting and :feeding opportunities of`station '9. Although the Mourning Dovedoes not have the status of_a game bird`,'in_Iowa, its:,importance as an-indigeneous wildlife species is aignificant ;The doves -that frequent.the basin "z maybe permanent res'dents'or-migrants and in 'most cases ), habitat conditions are :.favorable_for this species..:The con- trolling±factor i<,probably,.winter cover and the unavailability of food in addition to disturbance by man. The .'presence of white 'tail deer, the single big game species,:.thai may 'occur,,in., the _;,basins : is, questionable.; The of the study presence+of'',good populations to:the northwest ;area"•would,.! indicate transient use of the basin :by this. species'.,-,' • After;,•total;evaluation, it was concluded that habitat conditions 0' are 'Ffavorabie,'for"only,='al' few','species..;There,is;considerable y evence•that present land use patterns will result in the d K, and ality of habitat. is continued:,decline in the quantity qu by increased a' "ally;proliability'decline ;in, habitat :augmented s�>lapressure from'human.activities;and the presence ofdomestic } and dogs)! will result in decline of relative 0; predato'rs``(cats' wildlife populations. i•M yl Iry �f I vl i I AQUATIC ORGANISMS & HABITAT 'Samples for fish and benthic organisms were taken at seven stations. Fish samples were collected by s -fining pool and riffle areas over a representative section of the particular stream. Four to five seine sweeps were made in each aquatic habitat and specimens collected. Benthic organisms were collected by hand screen and either identified on site or preserved.for later identification. ] 'The morphometry of the stream section sampled was recorded and special;:notes were made of any physical indications of pollution. The; presence or absence of higher forms of ] aquatic:;vegetation.was.noted and recorded. Dominant Eerrestria1 vegetation was examined and recorded or collected y:at"these, sites;'(11-17)'and observations were made as to the rlIocaiion of terrestrial vegetation in, relation, to the aquatic environment. 'Land use patterns surrounding the particular sitewere also recorded. t�tr-1 In general, the storm water storage will have only a minor` impact: upon ;the !quality "and quantity of natural elements wit h�.n�the Ralston creek`watershed..Some terrestrial vegeta INts` tion will be'destroyed,in temporary ponding, or storage area but will'be replaced byimore water tolerant"species. development`'of permanent reservoirs (or wet -bottom }�p�?r storage;facilities),would result -in the. loss of vegetation iF}�r`u over the'area,covered`by the permanent pool. However, most u.,Y G ' of this -,loss would1consist,of, habitat' considered to be of r ar �" a r')reporto;;fDisplacementaofawildlife, species iscussed' in, bshould'beof lminimal. `+"Spec ies'composition ofi;the'aquatic community would be changed, 'especially!at 'the,storage sites, however, the over- r'�fi"'r, ecology of -the aquatic communi ty 'for thestreamand 1.x#Tr Ldetention sites,jshould;not be'significantly.changed and may improved The presence of sources of organic pollution }t`� %'amu°`u' th,au hoot thedwatershed, if not controlled', may, however, 'offset an 'im rovements"of e thaquatic community in the �r storage ponds �+ aq;✓f� 'IMPACT OF�FACILITY CONSTRUCTION' Theireport'does not;contain'anassessment of the impacts ; resulting from';actuah const'uction. '; Before such determination r ` a . 'can'be made,` individual"storage sites must be selected and 'consideration given;to the specific type, location, n �4fG» characteristics and design of the proposed facility.' 'Ki 1ik iY rl Wrrj r S � It is very likely that in many areas, the most significant changes in habitat will result from the actual construction of storage facilities rather than from their subsequent use for storm water storage. Furthermore, the magnitude of impact resulting from the development of a storm water storage facility at any particular location will depend not only upon the type of facility constructed and the extent and nature of work involved in construction, but anticipated alternate uses of the storage site. 0 53 i LEGAL, ADMINISTRATIVE S FINANCIAL LEGAL . Flooding,' storm water storage and drainage problems pose many;: varied and complex questions. The City's legal staff hast: >7 responded to a number of specific questions relating to 0 Ralston Creek Stormwater Management Program. X!memorandum from Tony-Kushnir,Assistant :City "Attorney, toi;a,l Dick Plastino,' Director of Public Works, is presented on "following pages. ,(The memorandum has been retyped to permi t reproduction in this.re ort). :< util Id:3 Date: March 3, 1977:if,' ' I�+ r f`(1NCTAN('TTl1N !1F nRn TNDG£ CVCTVM TMPPnX MMRMTC WRTPu nimcn mvn. ,i 1VATULtAL r LVW VC,. WATGlt L1Vf 11VNbG a:r, In, the area of Storm Water Runoff, land development and ainage,law varies fromjurisdiction to jurisdiction in'th< isudifferentstandards.or theories are applied to determine;th< rights",betty een'individuals. In Iowa, governmental entities:, are treated e same manner as private, citizens with.,,,:: regard tora inage; rights, 'and'duties._''Iowa courts have neve adopted !'oommon,'enemy"!'rule of -the common', law which"places;;; ;'restrict ions,, the 'right of a serviant owner to repel ysurfaceawater,;,.,,or.,lthe ?rule of:,' civil law!' which places a servitude';:upon.:the•lower land to receive all that,may, come;'; in`the In atural''flow'o= passage of -water. (See Fenna v.s Men3 236,,Iowa; 543, 19(N.W.2d , 689, Matteston V. - Tucker, 131 Iowa;..! 107 N W 2d 600) Instead,"a rigid`rule,was'espoused in an early case entitled Livingston v. McDonald, 21 Iowa '160 (1860), wherein it was;, .>`held that:, -- i "The_;owner-of:the.higher land has no right even in the. course of the use, and improvement of his farm, to collect;.. the,,surface water upon' his land 'into a drain;or•ditch,.increased in quantity or in a`manner "rdifferent'than the,'natural,flow, upon the lower lands ' of another,".to the injury of such land." 7 M GrP 1 Cff This rule, however, was modified to permit the upper proprietor to drain his land into a natural water course without.liabiiity to a lower proprietor for resulting damages,; although the effect is to throw the surface water in a_somewhat increasedvolume at times on serviant estate. (See`.Jenkins"v. Pedersen, 212 N.W.2d 415, 1975). Thus, the present Iowa law is that,a dominant landowner is entitled ' ` to. drain 'water' in the natural water course but cannot sub- stantially,increase or,change the manner or method of drainage of water onto a lower land. THE .IOWA`STATUTES ON SURFACE WATER .Because.of, the.problems'of drainage as discussed above, the State•;Legislature has acted in the area of surface water drainage.. Iowa 'has enacted a number of provisions dealing, with the: problems presented' by, the existence of water. (See code,'of•"IowaChapters.455-468); With respect to the' private +' icitizen, rtwo chapters'. are of particular' relevance, Chapter of:'the'Code of Iowa, 1975, which relates to individual' drainage rights,, and chapter 455 relating with the establish- ment of 'drainage -districts:. Pursuant to Chapter; 455 of the ;Code''of"'Iowa, 1975, an,: individual may, obtain. undericertain �- A.f. rc� umstances an:. easement of drainage;' across; the adjoining �ti4tirfv, owner's_iproperty: s: Suchan, :individual may: accomplish' this by �, making an<application with the County Auditor to establish n" easement if„it,can•;beIshown that: the proposed drain, [;t ditch,or'levy. is• necessary either for, agricultural, purposes ,or to ;secure'. a' more complete. orbetter, drainage.: ,The procedure for,.obtaining such an: easement is as set, forth in Chapter 465 n;t ; wherein',:the easement 'is ;,then,"condemned by; the County,,' for the <` applyinq',landowner.; All ' costs ,:'incurred in`the " condemnation ' and the dams es'!to an 'other g y property° owner.are'borne pursuant;ito 8465:13 by the, applicant. Again the construction �• w�of':any such drainage system must be along the natural flow �of�drainage r�'? „In'many.,cases,;.,the owners 0f,land involved may feel that it t; , 'would'be'more'convenient, beneficial,`and:,economical to form a"drainage district. This constitutes;a.political subdivision !y'xs l,`ti ofj,";the"`State° to :which are delegated: the governmental functions necessary, to fulfillits- purpose, of, drainage and reclamation t rofAow%and wet lands. ;This -.is:; accomplished. through" „the pro- , 'r 4,• ­Vision of'Chapter-455 which 'sets forth the conditions where upon such;a district may established."'The cost of " ' ,be establishing and'; maintaining a':drainage district is defrayed r by'"assessing. the' landowners' situated within 'the:drainage .all'of district pursuant to the procedures that are in Chapter 455. {Se e'8455:45''`Code of`Iowa','1975) r '' 55 1 GOVERNMENTAL SUBDIVISIONS Iowa courts have held governmental subdivisions, including counties and municipalities, to the same standards as individual citizens with ret to the construction on spec 'drainagesystem improvements. Systematically the courts its, have held that a municipality in grading and in guttering streets and public ways cannot collect surface water and flow divert -the same in a different manner from the natural either, through thereof. Governmental subdivisions may purchase or'through the power of eminent domain, acquire drainage easements over private property so as to allow the 1,21.of`,waters other than in the natural flow. ` -In'laddition''to the issues discussed above, a series of six � ` questions were asked, some of which concerned open channel rainage'and 'municipal,responsibility. Considerable research ' •'discloses;,that>this-area is'inlflux and that there are =numerous cases which'•differ'in result; each one differing in A, some`'; degree `as to circumstances and individual .facts. Accordingly;,'_I am.not able to discern any responsibility on part.'of'a:;municipality in the maintenance'of such channels. respect to' ,maintenance,,generally, the law_ assigns' the ; to responsibility.oL maintenance of'natural.watercourses s abutting property owners'.', Thus, ,the persons- responsible y }a, •r +for maintenance of,the watercourse would; be the owner of the property'upon�which that watercourse lis located. ' Th"e'answers"to the rest of the questionsareas follows: . Who'- is resonsible for en of encroachment 3 pforcement in the floodplain` or floodway. resulting not from new .con- , struction but rather from filling operations, landscaping or rr vrw+. z• ,. ��:•: Other.•minor,; improvements? 11. ar Responsibility'for,surveillance and, enforcement of.encroach- a meat`in'the,flood plain or-floodway resulting not. from"new . construction,but'from operations, ;landscaping .or L ,filling minor property improvements is presently, being delegated on I aR*''rpt rsnrr, " the:, statelevel 'torrthe.Natural, Resources Council pursuant to 8455A.33 wherein 1t is stated that "the: Council' shall, have vy the `power; to commence, maintain and prosecute any appropriate 'the u ; ,, 'action`to'�enjoin: or abate`a'nuisance'including any of r rforegoing�nuisances:and other nuisances:which adversely w, affect",flood,control." A• municipality. by ordinance can aut}ioriie" the•.City ,Manager or his/her designate with enforce-'' { q ment`:powers. [ ,f q 'a' ,, I 4. Most of the cause of flooding is encroachment on the flood plains. The Iowa Natural Resources Council has regu- lated the location' and elevation of new construction in the floodway and flood,plains for 4, years now by the establishment of floodways and regulatory flood elevations. This constitutes the'ataking ,of land for regulatory purposes without compensation. If',it could be shown the City would benefit by increasing the floodway width in a few'selected.areas by buying flood ease- ments on existing undeveloped land adjacent to the floodway,' would this action to increase the floodway create a'very large legal and financial problem? The whole area of police power versus the power of eminent l':` :domain, is complex in nature and scope. However, I would see'noproblems'in`the City buying flood easements on existing :_ ,.undeveloned land,adjacent.to,the floodway even though the origiInal'floodways..were*acquired without compensation. The ,• additionnalaL acquiring. of land should not pose any significant robleming p pect tothe legal aspects of the acquisition'. 4 5 Responsibility of parties for construction of storm water storage site upon the following sites: „ a on-undeveloped public land. v rt onstruction'and responsibility for storm water 0 , "storage'.sites on undeveloped public land is by reason +, " ..:ofi:s364"12.4iven,to a:city.',Said section states,•that a, a'city!is responsible for the care; supervision,`and a..: control' of. public.:grounds,. streets,` sidewalks and All f; Public,Ways and grounds open,, in repair and'. free from ,i nuisances .; h E b on undeveloped private land. ' LJ' 1 4 rl On, undeveloped; private,land ,'it is my understanding that +" 'the ; Storm,,Water! Management ,Ordinance provides for,; the i,C e` responsibilityl for the4 construction, of storm water storage ,sites given to the developer. " c retrofitted to existing developed land. 1, `' ?I With, respect to the retrofitting storm water storage site, on;exieting developed,land,a municipality can do so by:.entering,'into',agreements or easements with ,.property, owners. r �r R r , 1 ' � , x I 3 a jrT d: retrofitted to school playgrounds or other develooeZ`r ' . f� .' public land, ' The same arrangement can be made with respect to school n ', playgrounds and other public lands. Al `+ii e. does the City have the authority to condemn lands outside the corporate limits for the purpose of }' t�constructing storm water storage facilities? A city can enter into an agreement pursuant to 928E.3 iul of the Code of Iowa, 1975, wherein it is stated that any �Y '+ power or powers, privileges or authority exercised orr capable of exercise by a public agency of this state may,'_.!,,,, be, exercised and enjoyed jointly with any other public i,i agency of .the state having such power or powers, privilegMM or authority 'enjointly-with any public agency or any +{. r other state or the United States. This may be accomplisheddA` s t q'a `. through an agreement with the County for the purposes of Xu �';-' 1' condemning : lands outside the corporate limits for con- `rl,dc �'` structing storm water storage facilities. YF w� ADMINISTRATIVE - (LOCAL AGENCIES) ` m}�4�M" CITY ATTORNEY. The City Attorney and the legal staff provide n- � j:r,,, the Council and.City departments, with legal expertise and a, advice and defend the City in cases requiring legal remedies fijJ � d 1 Because of the legal complexities involved in drainage and "4er ��drin4y"?'4` flooding'problems of the Ralston, Creek Watershed, the City Yb plays a vital role providing opinions, addressing .; w. ,Attorney , , such items as.the City!s rights of emminent domain, citizens rights to alter, drainage courses,.libability of storm water " storage facilities and various other specific items.41, w,r;DEPARTMENT OF HOUSING" AND' COMMUNITY DEVELOPMENT: Principal,'.', funct ons with regard to the Ralston Creek watershed include '� r ,zv , the -development' and; updating of long range' comprehensive " + ' plan elements ;and implementation measures. Of particular> y,;*+, Wta' 'j t ?'3 ''�} '"', importance is the land', use plan,. which is intended:. to serve,,-', z„as a guide for future development by public and private agendea. .the, zoning ordinance -,;h-* ch is irL Lefided'tu impieureni LI1Q�J� d'nur i,land use?plan. ,P, `ra< The trees planting ordinance and floodplain ordinance ares specific long-term tools,. which can help minimize the damege; u from flood by 'slowing runoff and protecting the flood plainyd,, 1 coachmen . from enc t td), 6 The Community Development Block Grant Division within this der rtmcnt gists in the coordination of programs funded with HCDA funds. The division has the responsibility of providing staff assistance and acts as a liaison to the ,. Committee on Community Needs. In those instances where ,• block grant programs are not within the Department of 'Community Development, this division has the responsibility to ensure that all of the programrequirements are meta CITY•PLANNING AND ZONING COMMISSION. The Planning and Zoning Commission plays an ,important role in watershed management by; reviewing; and recommending policies relating to new development and redevelopment. ` rl .._The lapd,use' plan is used as a,guidc by the Commission when f,+ considering zoning changes which would affect densities, changes rin land, use. or other developments which might affect capacities of, utilities. Such utilities include storm sewers' and drainage facilities: Powers i and duties of the Planning and,,Zoning_Commission are, rf limited`'to:anradvisory,capacity to the City Council. The °. write' V' Commission;has;'no funding capabilities, except as might be +, authorized by the Council. ,.1 DEPARTMENT OF PUBLIC WORKS. This department is responsible ', for: the; overall management and direction of the Division of '` sq; Elf ,-Waste Engineeiing,',;'Street'.Maintenance '..TrafficfEngineering, Solid �`"' ".' ,; Equipment Services,' Water and Pollution Control. ,.._ Various'public'works.projects including flood prevention'and pro tection,are'within the jurisdiction of this department." Much of the': responsibility for; implementing the'.Ralston Creek Watershed Management Plan rests with the Department of Public,:Works. ADMINISTRATIVE - (STATE & FEDERAL AGENCIES) SOIL CONSERVATION SERVICE. The Soil` Conservation Service {SCS)..,gives technical ,assistance to individuals, organizations *'•` " and government. agencies :in'.conserving land and ,water ,resources. The SCS'slegal;,jurisdiction 'is confered'by several public a 1,aws .which give: the department many' duties. `' A few' of the {' for are the development and `,'functions`these"laws'provide of national soil and water conservation programs ,,.administration `through'•'con servation districts i` watershed protection and ; J' 'flood prevention projects; the Great Plains conservation 1 4�1 ; l+x, �Tl 57 (�}� programs; and multi -county resource conservation and develop- ment projects. The SCS provides assistance through conservation districts such as the Johnson County Soil Conservation District (SCD). uni ' e 1 Through the conservation districts SCS is helping m cpa and county officials, planning bodies, and developers cope with problems of erosion, water supply and disposal, improper 'i land use, flooding and sedimentation. r, .Watershed projects are a combination of soil and water con S ervation measures on private and public land; dams and other structural measures on private and public lands, and eP; dams and other structural measures on upstream tributaries Soil Conservation Service assistance that could be of importance to the Ralston Creek Watershed may include: A. Soil and land capability maps of land units and . woodland' suitability maps of woodlands. B. Information about the different safe uses and adapted crops (including grasses, trees, and wildlife) for each kind of soil." F'i Call Information about conservation measures:needed'on each 4 , - kind of soil for each of the different safe uses. D Onsite assistance to the individual in making a con- a servation :plan. for -his land unit.. E. •Technical assistance in designing, laying out, and checking the construction"and maintenance of dams, 4 1terraces, or other, structures;in selecting plant ?" varieties, seeding methods and rates, and cultural technical practices' to establish grass or trees as , planned; and in solving problems that arise in managing )-+ .} n pastures, woodlands; or'wildlife habitat. a JOHN SON` COUNTY' SOIL CONSERVATION DISTRICT. In Iowa, 100 soil conservation districts (SCD):and six conservancy M districts'have`been empowered by, the State with the ;responsibility to enforce conservation; of soil, and water resources: The'SCD`andthe City of: Iowa City have a signed! 1, "memorandum of understanding." Among the agency's many m"wa, responsibilities,;several.which could be significant to .fie Iowa City and Ralston Creek Watershed are: •the A. Pro ram - To prepare and implement a long-range program , Tor conservation and development of natural resources._f„'"' . • ,s� I `r 58 ISS: B' Education'- To establish policies for conduct of work; conservation education programs; meetings with local leaders, reports to public through mass media; promote initiative of land owners and operators in conservation programs. a C. Assistance - To maintain current knowledge of powers, authorities and responsibilities of State Soil Conser- vation law;.arrange for help and cooperation needed from �•. available sources. CostiThe Iowa General Assembly enacted legislation in July, 1973 to provide funds to share the cost of installing permanent soil and water conser- vation practices on agricultural land. n ;During the period 1979-1976, the Johnson County Soil Conservation District received approximately $30,000 - n per year from this source. The SCD completed permanent U, soil conservation.projects with this Iowa money as 508 of the total:costs,.25% matching Federal money and the remaining 258Cfrom the land owner. 'Additional local n .-funds`of other benefited parties (such as a downstream W city) may be used to 'reduce ,the landowner's costs: a _ IOWA DEPARTMENT OF ENVIRON MENTALQ UALITY IDE ( 4) . Thee. IDEQ - ' y"} is+Dili ,prsncipal:state,=agency responsible for the protection of,' the: environment'by;;control'of the quality. of air, water Q' `d (surface•' and.: underground)', noise,.'solid wastes, radioactivity, - and:;water supplies in Iowa The;;IDEQ has extensive regulatory r. .. r .r powers, some of which relate planning: to Ralston'Creek g i a' .t ..';•' •el ASetting.and enforcing water quality standards to protect - surface and underground supplies.. yr�> '8 I�.Adminiatering,.�the Federal EPA construction grant program - (See EPA) C Reviewing permits for construction of, water supply and b wastewater: collection:'and treatment facilities. D.:Control of solid waste (landfill), sites. rt E Control agricultural, wastes from large; scale animal ''confinement'`feedlots= The'IDEQ also has'provided'58 state .grant funds in addition a. td'the Federal EPA grants for 758 of the eligible costs for con struction,of.high priority wastewatertreatmentfacilities. The IDEQ is:`the'principa1 state'agency to which .the City. would ,,,:."turn; for. help in controlling large surface, water pollution c, outside;the'city'limits; n the upper parts of the watershed. IOWA NATURAL RESOURCES COUNCIL. In 1999 the 53rd General, Assemblypassed an Act relating to flood control, and the,:, conservation, development' and use of water resources of Iowa The Iowa Natural Resources Council (INkC) was created and;:.; established as. the agency of State government to promote.'tfie. policies set forth in the act and to represent the State` of Iowa in all matters within the scope of the Act. The Council's regulatory functions concern the diversion,,;;;' storage or withdrawal of water; establishment of encroach ment''limits, and. regulation of construction on any flood Y Plain. in 1972,.the'INRC completed a study and report on the determination of flood plains,:floodway limits and r minimnmi,protection levels, along Ralston Creek. The '..technical Iinformation in that report included delineation r: of flood plain: areas .and identifying encroachment limitation for the``Ralston.Creek area. 'Tnis,information has been'used:'t by the;INRC to issue building permits within the flood plain of Ralston creek since 1972. ,E U.S. ARMY. CORPS OF•ENGINEERS. The'Army Corps of Engineers. --n insfloodacontrol bearticularin onalareerrriversnal age cyAuthoritd particularly g y �3 rM for theacorps':civil work activity is granted in'general t legislation as well as in a series of flood control acts' .. Benefit-Cost.Ratios. All Cors flood ro'ects must specifically; authorized`bypCongressP The esti mated?b economic,',benefits:to be'.derived from'a project:; must,exceed the.,estimated costs. in order to receive project authorization. „ G Coat Sharing Project cost-sharing varies with the.typee of::.facilities involved.' With respect to minor reservoirs the costs attributable to flood control (including opers ' ation and.' maintenance) are borne entirely by the Federal-`. Government.' However 'local interests may be reqred ISI. required ',,toprovide, land;'<easements , and rights -of -wayif the acti proposed reservoir is clearly in lieu of a local prote r _ Ari?., t raj Y � i 4 �p p 'i.; }ipfi75 Y: i project. The Corps now requires effective local flood plain regulations to be in effect prior to Federal -'investment. The Corps also conducts Flood Plain information studies and undertakes small flood control projects. In addition to regulating the discharge of dredged or fill material in the "of waters the United States, the Corps has the authority of clearing ;and straightening stream channels and removing accumulated snags and other debris in the interest of flood control., Other legislation has given the Corps certain regulatory and permit -granting powers over such matters as the construction of dams and the alteration of the course or capacity of navigable waters under the jurisdiction of 'the:Federal government. a i U.S.L GEOLOGICAL SURVEY. The USGS is involved in the collection and•analysis,of a wide variety of water resources data. The r t Survey,s'; stream'' gauging' program, involving'a network of recording. and; crest stage gauges, has provided considerable 'information on flood flows in Iowa including Ralston Creek. . s.' r.Tlie*Survey,`hasprovided the flow record and maintained the : T „ . recording..stream,flow.. gauge, at, Rochester Avenue on the ?Y4, NorthkBranch'of>Ralston Creek..and.on'Muscatine Avenue on. Branch::.,'.The, USGS cooperated' with the City to install i+pproxiinateir 35 crest stage 'gauges on culverts and bridges, early;1960's:' ;High^,flood `level readings were taken r; at these:; gauges' in 1962, 1969 and 1972 and provided the City. I 4�4 t .::,'.`;.... with a graphic: record. The USGS+has participated in many studies and reports on streamj:flow.,,Under:Contract with'.HUD, field surveys .., ,:., „were made:of-`channel profiles and cross sections, hydrologic analyses;"and flood profile' elevations used in the Flood s .. , Insurance, Program, •p March, 1975. _ The purpose of, this, survey x: s i,was to investigate the, existence and severity of flood hazard fa yYy't,, ` F "•-'• in,'Iowa'City°and to`aid in the administration of the Flood Insurance Program and the Flood Disaster Protection Act of', -1973. -Initial use of.the study will be to convert the City to the;regular;,program _of flood insurance by'the Federal uLril,` 4' Insurance Administration. DEPARTMENT OF HOUSING AND URBAN DEVELOPMENT (HUD). -This agency.is;responsible;.for disbursing Federa ,grants provided r the;Housing and, Community Development Act of 1974 (HCDA). ; ..The'Act.replacesra number of.Federal programs connected with ; ,kiousing,'and;community, development. Local( governments are a eligible :for .100% grants (Community Development Block Grants) of,funding to implement a Community Development Plan. The I t � 59 level of funding has been based on community's previous involvement with HUD categorical programs, as well as the the population total, extent of housing overcrowding, and extent of poverty. The local government establishes, with citizen input, programs to meet community needs. In Iowa City, the Community Development Plan emphasizes a neighborhood redevelopment program. Activities have been planned to comprehensively improve older declining neighborhood. The Ralston Creek Watershed and flood control projects were planned as part of the neighborhood redevelopment program. U.S. ENVIRONMENTAL PROTECTION AGENCY (EPA). This agency > has principal responsibility for air, land, and water pollu- is tion control, programs. In addition, the agency responsible treatment grants provided for disbursing Federal wastewater II - Section 201 of the Federal Water Pollution .by;,,Title Control Act Amendments of 1972 (Public Law 92-500). These y: grants maybe used for construction of: wastewater collection and treatment facilities, treatment of storm water and com- s bined sewer flows. The 'grant 'program :is administrated to the } y through the'Iowa Department of Environmental Quality d; The' EPA; does not directly interface with ,conve� rational" Problems of,drainage:and,;,flood'control, However,,since,urban storm 'runoff'has`been°'shown.toadversely' affect water, quality, the b� d4�'ahYEPAj!has maintained peripheral interest., The EPA may be expected to''become.more involved as comprehensive water quality managementipians are developed. " The' \EPA,'grants may be used for study, design and construction' `v B or habilitation of sanitary sewer. collection:,systems which heo. .re reduce the cost of wastewaterrtreatment`by eliminating 1.4io extraneous'. water._'The 'total 'costs of new construction' or r rehabilitation of sanitary sewers must be less _than ,,the total 'costs-of.transportation;'and 'treatment. ,.The EPA regulations and`guidelines for making such studies and cost analyses are very ;complex 'and time consuming.. Many, projects, are funded which -im rove. the collection and trans ortation of wastewaters and%subsequently; reduce the flood damage resulting from sur- f)t '__. ''..-..•'c1:.f7 Iowa City 'currently has a grant from the EPA for Step 1 - Facilities Planning. The City's consultant, Veenstra and Kimm'from West Des Moines, have finished the field work on the 'first phase of the planning and have submitted the first report on Infiltration/Inflow Analysis. Observations n and conclusions in this first report which are important to the Ralston Creek Watershed Management Planning are: A. Areas of the city with evidence of damage resulting from surcharged sewers are being systematically identified. B. Subsequent detailed field studies of the sanitary sewer system in;1977 should further locate sources of extrane- ous water and recommend corrective action. C. New, enlarged and more sophisticated wastewater treatment facilities will be required in the near future and will probably be:located outside the flood plain of Ralston Creek. " FEDERAL INSURANCE ADMINISTRATION. This agency is within the 'U.S.,,Department of Housing and7 Urban Development. It is responsible for.:administering,the National Flood Insurance Program: The Program was designed to`offer,previously unavailable and/or `unaffordable`flood'insurance'at':reasonable ' Specifically intended as a substitute and eventual replaces- ax ment for,'Federal;disastertrelief for, flood occurances, the �'•"' ` program:is''intended for property owners to become more aware of flood,: hazards,', to'contribute. to, -their , own' protection, a 'and to'become'more fully indemnified (without having to �n r repay a Federal disaster Ioan).when the inevitable flood ti 7 :v,. occurs program is voluntary but participation by City (or ,,,,The. .the county) is mandatory before obtaining any Federally:: related, �. regulated or'insured- financial 'assistance:for acquisition or rconstruction o£ -structures in`flood prone areas.:.'Financial, aid would"include loans and grants';; including, mortgage loans and,disaster assistance: loans'. from either a Federal agency,;, such''as' FmHA,`.FHA, -VA, ;or'the Small Business' Administration,. or, banks `or savings and.: loan institutions. Thus, the reasons for participating are quite compelling. L Iowa _Cityis participating in the program,and will complete 4N its final'step with the adoption of the Flood Plain Ordinance which is beforethe City Council at this writing. (� U;1, a rz OTHER FEDERAL AGENCIES. There are other federal agencies with responsibilities for storm water and flood water manage ment. A number of these are highlighted below. Bureau of outdoor Recreation (BOR). This agency admin- isters the Land and Water Conservation Fund which provides , financial assistance for the acquisition and development of parks and open space. This federal assistance has figured heavily in the public land acquisition efforts of state, and local agencies, some of which emphasize the.purchase and preservation of flood plain tracts. ' The BOR program in Iowa is administered by the Iowa E„ Conservation Commission. The land and development funds <r for Kent Park came from this source. At the present; d time, the maximum limit to any single agency is $50,000 per year. kc� Office of Water Research and Technology (OWRT). The s' + ,OWRT is the principal Federal agency involved in the encourage i , M and financial support of water research. Various,', types of research grants are 'available to individuals,":• j private firms, educational institutions, and public agencies:)` Thea research of Dr. Jerald R. Barnard and Dr. Thomas Croley II at,the University of Iowa,on physical and jyr ;,•economic-aspects•associated Gy with runoff from urban 6 l,t' r growth using Ralston Creek, as a study model#were financed it i.l in part through a grant from the OWRT. ^,¢ P f )may YY�s `•i'¢ts National WaterCommission.. The National Water Commission was:;establishedrin.1968: forthe purpose of. reviewing' water; resources problems', policies, and programs in the;; context of their relationship to the total environment. -N k In 1973, the. National Water Commission published an ;;« �� „M1 extensive report entitled "Water Policies for the Future" nfri which contains. a: number of recommendations for the im provement of policies dealing with protection, develop w^ menta and use of'the.nation's water resources. 'Recommen ,' dations from thereport that pertain to stormwater and,': floodwatermanagement are highlighted below: A. Flood plains, should be treated as an important R resource, and should be managed so as to make"1a the maximum net contribution to national welfare' k , Y B. In formulating g plans for flood loss red " .:full and equitable consideration should be given to all practicable alternative measures. C. Legislation should be enacted to authorize federal grants to states for the purpose of + a� flood ma ^" lain P Aping, flood hazard identifi � cation, and flood plain management planning r and regulation. <r� nr:M D. Existing programs through which federal financial assistance is provided for the acquisition of open space should be utilized to the fullest practicable extent to encourage acquisition of flood plain lands. E. Federalagencies, should refrain from making any grants or loans or from insuring any loans that would be used for new construction in ' flood plains or for the reconstruction of exist= ing structures that have been seriously damaged b floods unless nless ade uate q provisions have been made to prevent the recurrence of such damages. National' Oceanic an& Atomosoheric Administration (NOAA). ' NOAA was formed in October 1970 by an executive reorgan- ,ization order to consolidate a number of federal agencies performing technical services and research regarding ithe oceans (and the Great Lakes) and the atmosphere. In addition to the agencies mentioned below, it includes ") r' .the''National Marine Fisheries Service, the Environmental ` Research Laboratories, and National Ocean Survey ;(formerly "the 'Coast 'and Geodetic Survey), and. the ,� Na tionaL EnvironmentaT'Satellite Service. T National Weather Service.. The National Weather Service nm Kt; monitors and collects climatological and meterological' data These data are'useful``inthe' planning' and design 1 Of`stormwater and floodwater projects: Through its extensive radar network,the Weather Service is able �j torprovide;advance warning of intense, thunderstorms ; x likely,to'cause.flash flooding in Iowa. Such informa- } tion is essential to effect've emergency action programs. r 1 Environmental Data Service. The environmental' Data ,i service publishes climatological data collected by ;the, National Weather Service as one of its major ' 'activities: J " Fish and Wildlife Service' - Division of`Ecolo ical Services. All federally proposed,,aut orizh ed, permitted r' or=licensed works' which' alter aquatic ecosystems must ,j be reviewed by the U.S. Fish and Wildlife Service and State' Fish. and' Game. Departments` with a' view to the conservation of fish and wildlife resources. The Hr' :.fish"and' wildlife, reports must be a part of any''report;to Congress:for'authorization or modifi- �,, cation of a`water.resource development project. .4 Funding is 'available for investigation, planning, acquisition of lands; construction, operation, and maintainance'of limited fish and wildlife enhancement and 'recreation facilities as necessary for public use on existing water 'development' projects , provided'` non-federal 'interests bear 'a portion of costs. ,'Non- federal public bodies must 'agree to pay 50% of separable..costs of'lands,and'facilities to`be included forcfish;;and wildlife enhancement and all costs of their operation and maintenance. 61 fel a � hr FINANCIAL The Iowa City Community Development Block Grant is the major source of funds for the development °theek ose solutionswhich Watershed Management Plan, including have been implemented. Grant funds from HUD under the HCDA are expected toibethe a major source of funding for Ralston Creek prof near future. Funds already budgeted for Ralston Creek project include: .11 FY 176 $80,000 Planning :and Mapping FY '77 $200,000' - Construction of Interim Projects FYI 0,78 $5B9,306 - Scott Boulevard Storage Site Future HUD funds available to Iowa City are: " FY '78 2/3 x $2;061,000 = $1,375,000 • "A FY ' 80 1/3 X $2,061,000:,= $ 686,000 The iowa'City fiscal year'FY 178 begins July 1, 1977, and ends i. (. '�mnbt r The^principal source'of-.alternative.local funding which could ri�s,^r #', be,used:,for. flood,protection .is general obligation bonds'. c, y; General"obligation bonds can be'i§sued by the'.city;;for "essential corporate purposes" without a.referendum:' "Essentii ;c r:M1 corporate purposes" includes street, construction and improve ments; ,the; collection : and disposal of surface. waters; the construction and''improvement'of culverts rand bridges, and the:; r w'ti ri 1:;protection, of..property.,.from,.the_effects of flood within or a without the., city limits: "Essential corporate purpose also includes''the?construction of levees, structures, conduits, , p nding reservoirs. and im ou yuj Roaduse tax receipts are used for. improvements to the city's n „ arterial street;';system. The use.of such funds for xight-ofr '. way.,,acguisition',and„the constructionof roadway embankments' (which could also serve as dams) would be a legitimate use. .iLih i �( f ” 4 N� tf f d 62 1 ` v� , 0 0 . FY 78 C.I.P. RANKINGS IOWA CITY PARKS AND RECREATION COMMISSION April 4, 1977 Update of Parks, Recreation and Open Space Plan for the Johnson County Regional Planning Commission 4 Four (4) Racquetball/Handball Courts $100,000 G.O. Bonds 5 Court Hill Park Tennis Courts (2) $ 28,000 50% Property Tax + 50% B.O.R. 6 Completion of City Park Bike Trail $ 25,000 7 Elm Grove Park Tennis Courts (2) $ 28,000 8 Wetherby Park Tennis Courts (2) $ 28,000 9 Softball Complex Approx. 10 # Item Cost Source of Funding Z Mercer Concession, Restroom West Side Swimming Pool (} and Maintenance Building $ 40,000 Property Tax 2 Developmental Money for Parks for 3 years $600,000 (annually) $ 50,000 H.C.D.A. 3 Willow Creek Park Tennis $100,000 14 Asphalt ISercer Psrking Lot Courts (,a (ip $ 55,000 Property Tax + Donated $500,000 Funds 4 Four (4) Racquetball/Handball Courts $100,000 G.O. Bonds 5 Court Hill Park Tennis Courts (2) $ 28,000 50% Property Tax + 50% B.O.R. 6 Completion of City Park Bike Trail $ 25,000 7 Elm Grove Park Tennis Courts (2) $ 28,000 8 Wetherby Park Tennis Courts (2) $ 28,000 9 Softball Complex $ 85,OOC 10 Willow Creek Indoor Recreation Building $ 50,000 11 West Side Swimming Pool (} City construction & maintenance $550,000 12 Riverfront 0 $200,000/year for 3 years $600,000 13 Fund to Purchase Additional Park Land $100,000 14 Asphalt ISercer Psrking Lot $ 30,000 15 Artificial Ice Rick $500,000 50% H.C.D.A. + 50% B.O.R. H.C.D.A. 50% Property Tax + 50% B.O.R. Property Tax H.C.D.A. G_O. Bond H. C.D.A. 50`b H.C.D.A. + 50% B.O.R. Property Tax G. 0. Bond 0 RAY TAX PLAN SEEN LEANING TO FARMERS In-depth study told on valuation proposal By JOHN HYDE Rglsw She Wray An in-depth study of Gov. Robert Ray's plan to limit Increases on home and farm valuations shows the Proposal would favor rural areas over urban, and benefit farms at the expense of homes and other classes of property. .. Ray has proposed that assessed values of homes and farms be limited to a 5 per cent Increase per year In each assessing district. ' A variation of Ray's plan, limiting the increase of home and farm values to 7% per cent per year, has been approved by the Senate Ways and Means Committee and U awaiting debate in the Senate. Either plan would "complicate the assessment system by severing the link between assessments and market values," says Drake University I economics professor Steven Gold. I And once the link between market values and assessed values U broken, Gold says, "it would be difficult to ever connect the two again, reversing decades of progress In equalising assessments on similar .property •, The study also Indicated the governor's plan would "sharply limit funds available to local governments to finance services "Gold said. The study was made by Charles E. Fart, go actuary for Toe Bankers file and o student in one of Gold's classes. Farr used data obtained from the state Department of Revenue for the period 1972 to 1976 and analyzed the eHset of Ray's plan in 22 assessment jur4dlctions — 23 counties and nine CUM. Before Fads study, the effort of 'Ray's plan bad only been analyzed In LIM Ootmty The nine eIdes, each 41 whiell us Its own assessor, were compared to thr counties in which they are located. to every Instance, exoePt I)avmport. Farr found the Saver"" plan would offer a greater redaction tv cooatm Inas cities For example, If Ray's plan A gone into effect In 1972, by 1976 homeowners In Ames would be paying property taxes on 82.8 per cent of full market value. Homeown- ers in other parts of Story County, however, would be paying taxes on 66.2 per cent of full market value. Using figures for both agricultural and residential property, the study 1 Indicates that by 1976 taxable values in Ames would be reduced by 11 per cent, and in Siory County by 22 per cent from full market value. . The disparity was similar for most other areas studied: The reduction from full market value in Cedar Rapids would be 8 per cent, in Linn County 17 per cent; In the city of Clinton 7 per cent, in Clinton County 15 per cent; in Des Moines 7 per in Polk County 12 per cent; in Mar- shalltown 9 per cent, in Marshall County 26 per cent; in Mason City Il per cent, in Cerro Gordo County 22 per cent; in Sioux City 9 per cent, in Woodbury County 24 per cent; In Waterloo 10 per cent, In Black Hawk ' County 19 per cent. Scott County and Davenport would both end up with a 12 per cent reduction. The study also showed the plan would give a significantly larger benefit to agricultural property than to bones. The study showed that by 1976, in the 23 counties Bludied, Ray's Plan would reduce the taxable value of homes by an average 22 per cent Rod farms by 30 per twat in only six of the counties studied did reductions for homes exceed the reductions for farms .. "Other things being equal, this change In shares of assessed valus- lioro would favor agricultural Prop' erties over residential properties for property lax purposes," Farr sold. The governor's .plan also would have the effect of shifting the property tax load from farms to homes is rural counties, Farr said. For example, in O'Brien County, homes carried 1s per cent of the to burden It 1976, and would have carried 19 per cent under the governor's plan. Agricultural properly carried 66 per cexBt of the burden Is 1976, and would have carried 66 per cent under 1'.tY4 proposal inurban counting, the study showed that the proportionate share of both bone &Rd farm property ywoula decrease moderately, putting {rwater burden on commercial induw trial and utility propertY clawang Equalization of Burden By comparing the effect of Ray" plan on conllguous counties, the study also showed the effect of Ray's plan on equalization of tax burdens For example, Ray's plan would result in a 33 per cent reduction of - taxable values in Keokuk County, and a 22 per cent reduction in neighboring Washington County.' Other reductions In contiguous counties studied: Story 22 per cent, Polk 12 per cent; Adams 25 per cent, Cass I6 per cent; Buchanan 23 per cent, Linn 17 per cent; Worth 26 per cent, Cerro Gordo 22 per cent; Marshall 26 per cent, Story 22 per cent: Buchanan 23 per cent, Black Hawk 19 per cent; Buchanan 23 per cent, Fayette 19 per cent; O'Brien 27 per cent, Cherokee 21 per cent; Clinton 15 per cent, Scott 12 per cent; Pottawattamie 18 per cent, Cass 16 'per cent; Wimishiek 20 per cent, Fayette 19 per cent; Cherokee 26 per cent, Woodbury 26 per cent. The study also Indicated Ray's plan would have a significant Impact on the lax base of cities and counties. For instance, in Keokuk, the 1976 property values of homes and farms would be only two-thirds of the taxable value under the current system. The property tax plan under con- sideration in the Senate — limiting Increases to 7% per cent — would providea slightly larger tai`base than Ray's plan.. . The Senate plat is described as a temporary measure, lasting only two years. Tax Jolt Possible However, one frequent criticism of the governor's plat Is that, once begun, 11 Is almost Impossible to stop, without giving homeowners and farmers a tremendous tax Jolt some time in the future. The same criticism would apply to the Senate plea Under both plan, assessors would continue to determine the full market value of homes and farms. The effect on individual pieces of property would be determined by comparing We total value of each Close of property to Its total "regulated" value (the value It would have if allowed to Sim ow only 6 per cent.) • The resulting ratio would then' apply to each piece of property. For example, homes In Unn County. Increased 5.95 per cent in value from 1972,,to 1974. The regulated value could Increase by only 5 per cent The ratio of regulated value to full value 'would have been 99.12 per' cent. Therefore, each home in Linn County; could have been taxed at 99.12 per; cent of its full market value In 1974. In 1975, home values in Linn County. Increased 27.17 per cent. Again, regulated values Increased by 5 per cent, giving a ratio of 75.88 per Cent homes In Linn County In 1975 would be taxed at 75.88 per cent of their full value. Gold has previously stated that this assessment method, In addition to being unfair, would make the property tax system almost Incom- prehensible. Gold noted that the state comptrol- ler's office had criticized Fares study because the period analyzed, 1972.1078, was marked by an unusually high inflation In home and farm values Gold said that criticism "seems Ir. relevant to me." He agreed that during 'normal" limes the govemor's plan would not 'have as great an effect, but noted that If times were normal the plan "would not be needed." . 11 � 1[\,!G LITICNIION - oo 00 PAGE 1 _ w CASE CAPTION z _ z_... U zAND w W a cc fL Cr I- U) COMMC11iS/STATUS o o z SUBJECT o ° ) o a EE U cc Q CL Bjornsen Inv. Co. V. City Dist, Continued_ Settlement • (contract suit) Ct, T. K. Plastino possible, Woodburn v. City Dist. (condemnation appeal, Parcel 65-13) Ct. J. W. li. Kraft Steele v. City Dist. (condenination appeal, Parcel 65-13) Ct. J. W. N. Kraft Stasi, Inc, v. City Dist. _I (condemnation appeal, Parcel 84-6) Ct. .1. W. 11. Kraft Little Caesars v, City Dist. (condemnation appeal, Parcel 84-H) Ct. J. W. 11. Kraft . Kinney v. City Dist. I (rnndemnnlinn al pr -n 1, Parcel 84-12) ('t. •I, XV. il. Kraft - Parris v. City s I !�l't. 11 Dist. —! I—'trial set for April 12, 1996. (eonden.n,,tiunnpp-al, I Parcel 84 -13) J. IA IL Kraft I ('untinued for hastham. � _.. 4m«I PurPv y — (; •.., { l) 74 t '. II It. III nn II nn rl_ II II I )ATE 4-15-77 PENDING LITIGATION PAG E 2 W CASE CAPTION ° — ~ o w AND w z a 2 '' z o o �U z w COMMENTS/STATUS LL SUBJECT SUBJECT �0 v CID nova o z ov CC Q a n_ Peet v. City (assessment appeal) 16/28/Dist. 74 Ct. A. R. Plastino Korshoj Const_ Co, v. City 7/17 U.S. (digester suit) 74 Dist. J_ W. Ii. Plastino Ct. Rock Island R_ R. v, City 10/10/ Dist. (quiet title -S. Market Square) 74 Ct. B. 13. Kraft Amerex v. City 10/15/ Dist, (damages suit) 74 Ct. J_ W. 13. Kraft Baker v. City 2/7/75 Dist, Adverse District Court (Denver boot case) Ct. T. K. 1 Strabala 11 decision appealed to Iowa Supreme Court, Lynch V. City 3/14/ Dist. (civil service case) 75 Ct. J_ W. H. Miller Stevens v, City 5719T -Dist, (access & drainage suit) 75 Ct, .r. K. Phistino Moore v. Epstein 7/ 18/ Dist, 'lb be set for trial. (I,J. ,se, 'tc•) 75 It.(damages W. H. l:pr tcin V. City R/11,11 Dihl. ��Short (condemnation appeal) �� 75 ��('t. R. %A .1. II 11[�r-;ift II )ATE 4-15-77 PENDING LITIGATION PAGE 3 CASE CAPTION z m z -^ ^,- W w AND w Q o o U-� o � z COMMENTS/STATUS LL o z SUBJECT a vo w 1 °'v a a U WQ Voss V. City Dist. (U. R. condemnation) Ct, R. W. J. Kraft Rock Island v. City Dist, (assessment appeal) Ct. T. K. Plastino Fireman's Fund v. County 6/29 Dist. Settled, & City (civil action re car) 76 Ct. A. II. ChristianServices 7/7/76 Dist. v, Board off Review (#43272, Ct,. J. W. H. certiorari action) Christian Retirement Services 7/2/76 Dist. v. Board of Review (#43273, Ct. J. W. H. appeal) City v. Westinghouse Lenrning 7/29/76 Dist, Appealed to Iowa Supreme Corp. (human relations suit) Ct. A, R. City v. Yellow Cab Co. 8/5/76 Dist, !hums.n rt-44,ions suit) fit, 4.. R. I Paul -Helen Building Asson. Dist. Covered by insurance, v. City (water damage= crisp) 18/10/71 Ct. T. K. however rerervntioms of riilil �, City V. .I, C, White Cn, i/ ] 5/'.' UiHt. (cross petition) Ct. T. K. ��l'las:tino �� )ATE 4-15-77 PENDING LITIGATION PAGE 4 °; CASE CAPTION m W AND 11J Z ¢ � z o o o a z v) o COMMENTS/STATUS z SUBJECT 0 W o o CL X tl U tr Q Courtcrest, Inc, v. City 10/14/ Dist. (zoning suit) 76 Ct, J. W. H. State v. City & Korshoj Dist. Judgment rendered for Const. Co. (damages suit) Ct. T. K. City. Appealed to Iowa Supreme Court. City v, Sanhueza 8/26/ Dist. 76 Ct, T. K. Siders V. F. W. v. Olin Lloyd & City 11 /18/ Dist, Plaintiff dismissed suit (damages) 76 Ct, 13, B. Plastino against City with prejudice. Young v, City 11 /19/ Dist. (zoning) 76 Ct, R. 13, Kraft I . Conner v. Rock Island, 12/6/ Dist. Coralville & City of Iowa City 76 Ct, J. W. H. Kempf v. City 2/ 16/ Dist, Injunction granted, Further d°:o:th 0ndge suSt) Berlin �{— licai ing scheduled for August, 1977, City V. Philip Cary 3/31/ Dist,, (barbed wire) 77 ct, A. R. Siders j I City v. Johnson ('n„ i-1 al. 2/ '41 Ilial, , (U fi, tux suit) I 77 I C't, B. H, Clluves �� I :LATE 4-15-77 PENDING LITIGATION PAGE 5 w _ CASE CAPTION z m z U. W LL� AND W a W 0 o o 7 U) o COMMENTS/STATUS z SUBJECT °o Q Cf) � �U0W. Q a U C City v. Dorothy Myers, et al. 11/3/ Dist. A. R. Glaves (quiet title) City v. William Bunter & 3/16/ Dist. Richard Phipps (handicapped 77 Ct. B. B. Siders housing) Svoboda v. City & Oakwoods Appeal Dist. Awaiting decision. Dev. Co.; City v. Oakwoods 11/18/ Ct. B.B. Plastino Dev. Co. (cross petition) McGinnis City v. Dean Oakes Dist. Appeal from Magistrates (rental permit) Ct. 13.13. Burke Court. I �I Ii I �I rH ' April 15, 1877. Dear Iowa City Resident: - As art of our program to obtain broad participation of all Iowa City residents in planning for the futureof the city, we are mailing this City Guide and Survey to all households in Iowa City. University students living in dormitories are also receiving copies. We hope you will read the Guide, which provides information on how Iowa City operates now and what alternatives are open to for the future. Then please fill out the Survey and return It to the city es soon as possible by handing it to a city bus driver land obtaining a free bus ride), or to a parking attendant in one of the municipnl lots (for 251 free parking) or mailing it back (postage is prepaid). Your participation and time spent in filling out this Survey is greatly appreciated. We need to hear frofn you in order to make the Iowa City Pin twat reflect the diverse opinions and needs of the people of Iowa City. Sincerely, -jt la.w 0. tic� ttauc�t Mary C. Neuhauser, Mayor and Che Other rrmdbers d, theComprelsrt sive plan r ✓. rdinatinreommittae: iCouncllMembers: p ftnningand Y.oning�(bnunivsinnT7vmMrY CONTENTS' 1. Introduction:] Planning for People. 2. Iowa City y, Past to Present. a 3. Our City Government. µ 4. The Planning Process. 5. What We Have Learned about Iowa City.` 6. City Choices. N 7. O•uestionnaire. Prepared by the Department of Community? Development, City of Iowa City, Iowa. April, 1977. Photographic "Credits: Drake Hokanson, Department of Community 'Development, Iowa State Historical Society, Did Capitol, National Association of Home Builders, Nouse and Horne, Architectural Forum, Progres- sive Architecture..ti Communication assistance provided by Sasaki Associates and Attie & Caller Studios tiylC �ttiftY r� +�W .CITY OF IOWA A'ASHIN" St 10.1.a CITY ktl -I fib Cities don't just happen. They are the re- sult of people living and working together. Cooperation is necessary so that everyone's needs are reflected in the way the city oper- ates. Without cooperation cities don't work. A new plan for Iowa City is now being pre- pared, a plan which will effect how you and your family live. Because the City Plan serves as a guide to the City Council in making deci- sions as to how Iowa City should develop and as to how money should be spent, the Plan should reflect the concerns of the whole city. The survey included in this guide provides an opportunity for everyone to express his or her ideas on the future of Iowa City, Already the city planners and city govern- ment have begun to meet with the public and representatives of local groups to begin the planning process. Recently a public opinion survey was given to a random sample of Iowa City residents. Much of the information gained from this original survey is the basis forthe People's Guide and Survev. The purpose of this leaflet is two -fold. First, we want to let you know what we are doing and what we have found out about Iowa City. Secondly, we want to hear from you. Iowa City is a small city which has experienced its growing pains, but we like it and think it is a nice place to live. We hope you feel the same way and will help us plan for the future by fill- ing out the questionnaire. Thankyou. E 10WAZITY PAST TO PRESENT In the 1830's, when Iowa was a territory and being west of the Mississippi River,was far West, Iowa's political leaders decided to f7ulld a new city to house their new capital. 'W -he already. developing cities along the Mississippi were all rejected in favor of the chance to choose, plan and build a capital central to the territory. The federal government offered four sec- tions of any suitable land as a townsite for Iowa's capital and in May of 1839, three men chosen by the territorial legislature selected the site where Iowa City stands today. This site was described as a spot on a hill- on the east bank of the Iowa River in Johnson County—a site judged to be "both :beautiful and healthful, safe from the floods of the capricious Iowa River and bountifully provid- ed with timber, stone and pure water." A surveyor was commissioned to draw up a plan for this new town, Iowa City. The plan he drew had a fine sense of order and beauty, as well as a sense of the city's impor- tance as a place of governfrient for this rich and newly -settled land. . Iowa City's first planners carefully surveyed and platted the townshe With a grid system of streats and avenues perpendicular to one u7rothel creating uniform biockb uno building lots. Within this basic form, they borrowed from the plans of other American cities and carefully considered the land, the river, and the needs of the new city and its people. The most important building, the Capitol, was given the most impressive site. A four -block square high above the river with a view of the entire townsite, located between the streets they named Jefferson and Washing, ton, Madison and Clinton, was designated Capitol Square. The Capitol was placed in the center of this square, where the old stone Capitol stands today. Heading east from the Capitol was the city's broadest avenue, Iowa Avenue. This ceremonial street, patterned after Pennsylvania Avenue in the nation's capital, Washington, D .C., led to the Gover- nor's Square, a place for the territory to build its governor a home. Borrowing from Phila- delphia's city plan, the Iowa City plan called for three one -block markets (North Market, Central Market, and South Market) as well as a central city park bordered by two churches and a school. Two other sites for churches and even a college green were also Ionated on the plan. The orderly blocks and uniform but ample lots provided sites for numerous houses and businesses. The planners also considered commerce, construction slid transportation. Thev desip sated one site along the Iowa River as a turn - but yard, and u second as a quarry. Beauty Tie Or1ybI11 plhopMPh �V of low- CItY tlrt,wo by l Judwn In 7871 lfuwrw�Y}ulluwn SI�Ir Nut.✓K✓ SuirfY+l STAT[CAPITOL and recreation were considered, too; a wide area along the river, not far from Capitol Square, was designated as the Promenade, an open space reserved for "public purposes." The face of Iowa City grew and changed rapidly, transforming this original paper plan of 1839 into a chy, but the grand city envi. sioned never quite happened as planned. The capital city began to grow rapidly under national and state laws, .but without a political structure of its own. So, In this gov. ernment town, there was no elected citizens' group to make docialons and take action on itmus such as sanitary conditions, use or misuse of property, or civic improvements. For the city's fine 14 years, repeated attempts The original lithograph map of Iowa Clry drawn by L. Judson In 7839 lCauttesyalIowa State Nistoncel Society/— 1�� ❑ 1° El E Lis] Df 1 lJ, eRgln c _ srnccr `I 3R�7•a •',a�rfL .>tl >. .w• ' `' ice` I [ I a e s B e 1 I' I J a + ❑ p� NNga.9� ®g OUTLOT I�� oULIIT ClT'2D � l; x e r T e e a f I el j��a7T'�as' +� a L1111]JT�][Jj.Sl�I1 re®9a 1�5 agog tlE L71 � NUSN,LDa .I �►�I.I '� � (' STREET W RMAsl' C8Y17F0� I-T�I'T1 IIY ����� k CHURCH I Gal �lJ.}IT1 el ,i�� n �. `i iso • %�����'le�-r AC kilt M'r iAT/OY.1 i `�� FwIflCHIID ELKO r5e18 5� 5678 50T e' 3099 bYaBF wv[Nro s &, Afv, L lata H'i •aaL t•Jt�l' .*B1 a1 .,)tL Lia ll 5� �` >• 5 f T e e c B S GLDDNINGTON Et l591 IJtLea1111 �♦I84'�I1l,� 4]{lE lJtl.latl {p tl � 58+e 6 , s =^yff i+ tl 58tB 6 e : [n°�-a INnII H Ll�'_LJ L•.aTalJ$.T' P—iI� I�Iu T� i(Fis c + I a L Bl 1.7, -11 "L .] rAY1TpL *' 7� !° �aI,TL al t 77.1 11 4'QUAnF, o „aal ly� �I�IJ 11Jzl. ' 197 � L 1 ARE f`I,'�!s1�11 I`_i' 1 I -1i, (ll� all The ant Rock Island Railway Bridge over the Iowa River. rFW- Kenr Peorogrnpn eoeecoom to incorporate the town failed. According to local history, this was due to the distinct financial advantages of not having to pay local taxes without local government. By 1853, when the accompanying conditions of no local order became too evident, the town was incorporated and after some initial resis- tance from irate, formerly non -taxpaying citi- zens, ordinances were passed to begin to correct what a writer of the time described in this account: "Once the townie had been a beauty spot of the untouched wilderness, but care- lessness had changed it to a sorry ugliness. Streets were unpaved and ungraded. In dry weather they became a desert.of dust. In will, hogs r1f mud In which breh'oxnn and wagon sank to mired helplessness ...tin - taxed dogs and hogs roamed streets ..The Capitol Squereand the City,Piuk were graved byVillage lilows1wi Iowa City's future as the capital of Iowa chinged when the territory of Iowa grew and then became a state. By 1856, Iowa heu prown so the+ Iowe City wet nu Ionpel t.t alta' to the state. That year, the legisieture voted to move the capital to the more cetltial Iota lion of Des Moines within two years Also m 1855, the State Un versi:y Upeucc a 10i.. City and soon took over the site where the of thousands of immigrants. These new- comers were of many different national and religious identities: Bohemians, Germans, Irish, Welsh, English, Scottish and Amish - Mennonites. Neighborhoods such as "Goose- town"north of downtown Iowa City, named for the flocks of geese tended by its original Bohemian residents and known for its large and well -kept backyard gardens, are remind- ers of the ethnic history of the city. Transportation in its many forms also helped shape the city. In the early days, Iowa Citians had great hopes that steamboat travel on the Iowa River would tie them to the rest of America. Several steamboats did operate on the river, but on sporadic sched- ules, not like the regular and economic travel and freight on the Mississippi. The natural Open spdtwnacn Stili t a ;xitilb diung Me fiver is proof that river traffic was never a major force in the city. The transportation force thtil diff chan}lt the city v%at'lhe railruad. lu IAh3 thr, P:-tisstr 'inlu un(l Micsntui rluihuad txtne, to It,+r:a L.ny anc river travel wab nu longus nucc s,ury For several your;; Iowa City wes 1hs- wr•h4rrrl terminus of the nail line J'W b., 11 t:.IIW.J IlWA Ile I4v1.ICip UtW AC tiers in stun, ane) hilly, at, well (I5 u placc fol nut.,,. I,. n,.6 qn14 ,. nr1e t.v:u,r ,.r htv,m', The development of the University of Iowa . ,has shaped the form and character of Iowa City more than any other single factor. Ever since its opening in 1855, the University has - attracted a diversity of people, contributing to the continued growth of the city. The rapid increase in University enrollment in the 1960's' had a dramatic effect on Iowa City. Enroll- ment doubled in less than 10 years (between 1960 and 1970), causing an excess demand - for housing—a shortage which is still felt today. Other effects of the increased enroll-, ment included the development of a campu bus system and a general stimulation of thW., economy. Uniwolty or Iowa Pentacrest In the '193e's. !F. W. KMt Pwr"t,"ph collecbmJ Like the people that the University of Iowa brought to Iowa City, the University facilities have influenced the form and character of tilt, city. Uruvetsay uuiicengs reflect every era from the 1850's to the present. The mar ty campus areas on both sides of the river art tilt, wsultb of University plans. University I)UilldillrV; Will SIVMUn(flrl(j 011011 tilluceS uft, now° locauto where file ongulai city prnme nude hed heon. Other university areas are inte+grai parts of till' downtown culler, Still Ulltul altLab "It; Uelltuit ui thwi uivil, buol tilt, the Univoisity Marliral Center and hospital,; -city and soon took over the site where the Capitol was'located. Thus, the city shifted from its original purpose as a political capital to an educational center for Iowa. - Clinton Street. 1851, (F. W. Kent Photograph Collection) The history of Iowa City from the late 1800's to the present parallels the develop- ment of the country as a whole. The people, events, and .decisions of these years have contributed to Iowa City's present form and character.' Rather than a detailed chronolog- ical account of the city's later history, what follows is a general look at some of the forces that changed Iowa City from the plan of 1839. The people who came to Iowa City were obviously an influence on the character of the city. As early as the 1850's and continu- ing through the early 1900'x, Iowa City and eastern Iowa as a whole were the destinations Tnet6 LU ,wiJ an„ may, m .. .... .. ......... . markets, hotels and trade. Many of Iowa's railroads were planned while Iowa City was the capital, and thus many of Iowa's early railroads passed through Iowa City. In the early 1900's, two important rail lines were developed: one, the city's electric trolley line v.•'-' h provided good, pollution -free, in -city U,wel from 1910-1930, and the second, the interurban electric rail line from Cedar Rapids to Iowa City. The Cedar Rapids and Iowa City Rail Company (CRANDIC) provided excellent service every hour on the hour for both passengers and freight between the two cities and the small communities and farms on its route. This rail line which ran trains at speeds reaching 70 mph was in operation from 1903 to 1953, when it lost riders and business to automobiles and the highways. Business and industry have always played an important role in Iowa City, too. Numerous manufacturing plants making products rang- ing from gloves to glass grew in the late 1800's. Flour mills, breweries, bakeries and dairies were located in the city and dependent on the surrounding agricultural lands. Com- mercial business was centered on Washing- ton, Clinton, Dubuque, Iowa and College Streets, creating a'downtown filled with activity and interest. ' The one-, two- and three-story downtown buildings often housed shops, offices, businesses and residences. In recent years, the Iowa City of the 1839 plan—now occupied by the downtown area and parts of the University campus—has lost much of its vitality. After a decade or two of neglect, many of the old buildings in down- town Iowa City were demolished to make room for new developments, Some of the buildings which remain are no longer centers of activity. Recent development has occurred along the major roads in and out of the city, moving activity away from the downtown area to the edges of the city. Efforts are now being made, by citizens as well as the city administration, to rebuild and revitalize the downtown area and to better plan the devel- of the city outside this central core. opment The most recent city plan, prepared in 1961, is no longer viable because of the city's rapid growth and recent nationwide changes in• conditions. The changes were brought on in part by the energy crisis, inflation and envi- ronmental Foncerns, and affect housing, transportation, land use, and. other aspects t of our daily lives. New planning for Iowa City is now beginning to "carefully consider the land, the river and the needs of the city and its people," just as the first plan of 1839 did, but this time it's not just a paper plan, and the people whose needs are being considered i are invited to contribute their ideas and ex- press their concerns about the future of Iowa i1 City. j s ; 6� f. Gerson ene ....... .. ........:. .-__x,'_' _.., -,, . OUR. CITY GOVERNMENT Cities don't just run on their own. They re - ire the cooperation of all the people living �Ehere, and like a complex business or piece of machinery, they need someone to direct the show and keep the wfiole operation running smoothly. We in Iowa City have chosen the council- manager forrn_of government. Residents elect the courvcll members; they iniurn elect a' one of thelr•ov+m members as mayor and -head of the council _The council then appoints a city manager who 1s a trained professional. The day-to-day operations of the city are or- ganized under ,the city <manager into several departments aerhich provide technical assist - once to the Councll and carry oik its directions. Many citizens take an active part in making recommendations to the Council and city staff. Some of these citizens are selected by the Council to serve on various boards and - commissions, -such as the Parks and Recres- tion Commission, Board of -Library Trustees, and Committee on L'ommunny Needs. These groups assist the Council by conducting studies of various community affairs for which 'Ole Council sirnply can't find lite time. On the basis of these -studies and public, Iwarings the boards and commissions make recommends - tions to gulde4he Council. TheCouncil legislates to achieve desired lroeuhe'tn Yhrfm •ways: 1) the -passage of a �motlon,•ouchas s motion to fefer on item to a committee; 2) the passage of a resolution, for example, approval or disapproval of a sub- division; and 3) the adoption of an ordinance, such as the Flood Plain Management Ordi. nance. Probably one of the biggest tasks the Council faces each year is allocating the avail- able money for capital improvements and operating budgets. This year the total budget is $18 million. How much of this money should be spent for a now library? Should we have more tennis courts and bikeways, or do we need a new sewer system? Money for the day-to-day operation of the city must be divi- ded among city services; salaries, and special programs for the elderly, recreation, and so on. What makes the allocation process even harder is that money, from *certain sources is earmarked for specific purposes and cannot be used for anything else. For instance, the city has received federal funds for preparing our City Plan. These funds ware received ander the Housing and Community Develop- ment Act (HCDA). By participating in the planning process you can help the Council set goals and objectives for priorities in spending and other long and short term decisions. THE PLANNING PROCESS APRIL I MAY -JUNE ( JULY I AUGUST -SEPT. OCT. t PUBLIC I PUBLIC i I PUBLIC TEG11NICAl �� RFP/11416 I P A 1 COUNCIL. OEWHAI SUAKY --- o, v,.c«•. .� ,. �..., n, vnn. .u�,.,. ,a, i 1 1A a �� cou�lNa J COUNTY j RF voHTs afAF/ 61AFF e1AFF" The Council legislates to achieve desired results in three ways: 11 the passage of a motion, such as a motion to refer an item to THEP PRO Planning can be described as a wayof look- mg.at all the'pieces of a city, understanding how, they work together and recommending howto maintain what is good, improve what is,bad, and.estimate what should happen in the future: Planning affects such city -build - Sing activities -as widening roads, locating new parks and zoning new areas for com- mercial and residential development. The Comprehenswe City Plan is intended to guide both public and private decision -mak - ;ng, but unless it is closely related to chang- ing conditions it won't produce'satisfactory results.: The existing Comprehensive Plan was developed in, the 1959-1961 period. It no longer reflects conditions in Iowa City and does not provide an up-to-date policy frame- work for today's decision making, Courts in- creasingly vse a city's stated plan in ruling on land development decisions. Also, a newly adopted comprehensive plan is needed 4for Iowa City to continue receiving federal funds. Parts of the Plan 'What should be Included in the new City Plan? The Plan will be made up of three elements: physical planning,'human services planning, and citizen participation Physical Planning dents with the use and hr lure use of land In Iowa City. Land uses should be organized so that they ate contpati V, STAFV I j w STAFF I 'CANNING ESS ble with each other and the environment. Most land is in private ownership and each owner is free to initiate development or de- cide to preserve that land. However, the city does put certain controls on what an owner can do. These controls are represented by zoning ordinances, building codes, subdivi- sion controls, etc. They are enforced to bal- ance the wishes of individual land owners with the overall public good. Human Services include those programs (Job Services, Daycare, Meals on Wheels) that the City provides based on citizens' needs and desires. Since many of these services are offered on a county -wide basis, the Johnson County Regional Planning Commis- sion is responsible for the Human Services Plan. The Johnson County Human Services Plan will be incorporated into the Iowa City Plan. Because the plan is a description of com- munity needs and interests, planning must give a voice to everyone who cares about how well the City works. This is the purpose of the Citizen Participation element of the Plan. The accompanying diagram shows how the chizens fit into the planning process. Producing the Plan How do we go about developing the City Plan? The City planting staff began work on the Plan by preparing technical reports of ex- isting conditions such as Trafficways and Housing (see Section 5). At the same time, public input was solicited through a sample survey followed by the general sur- vey you are now asked to complete_ The Comprehensive Plan Coordinating Commit tee (CPCC) reviewed and approved the tech- nical reports and will receive the survey re- r. sults for consideration. From these -results and subsequent neighborhood meetings (dates and locations below), the CPCC will develop goals and objectives to guide the staff in producing the Plan. A public meeting will be held by the Plan- ning and Zoning Commission prior to their recommendation of the Plan to the City Council. The.public may also participate in additional hearings before the Plan is adopted in October, 1977. The approved plan wvlll be a living documem—a long-range guide to the development and operation of Iowa City. April 29th Horn School (gym) Neighborhood Meetings April 25th 447nver School in April 26th Horace Mann School (gym) April 27th Recreation Center April 26th Southeast Junior High•School (cateterw) April 29th Horn School (gym) wwaff HAT WE HAVE LEARNED ABOUT IOWA CITY POPULATION ft HUMAN SERVICES The current population of Iowa City is just under 60,000, and it has been projected that the population wHI increase to about 60,000 by the year 2(100 and 70000 by 2030 if cur rent iocai, state and national trends continue. The Iowa City populutmn is el avacturiaud by a high proportion of people in the 15.34 age group WIN,) which relaClB the constant aturt+enl p[gnrlfflin,. rMlo, �,lynilir�nnr ehnrBOr0tlnlirL ni 1,,wk, COY t: IomillIn V,h r,. in Iowa City --a very high proportion—is non texabie. This characteristic is quite dif forent from other cities which have industri- ally and commercially based employment, end requires careful livention ir• planning so that aUeets, schools, parks, bus".; and sowers t: ul. br constructed anti uperdteai ellrciently. Ona of the prinlmy concerrr.� of land use planning is how land uses are arranged in the community, In gonorol, land uses have ape r'ihr lucanonnl urnuimrnnnt[: %'v exangtle, 0 a high proportion of people in the 15-34 age group (58%) which relects the constant student population. Other significant : &]Hbracteristics. of Iowa City's population in .. I. - `._, _-..,...a :.........., Innty 701. of our level), a small minorify population (2%) and a high mobility rate. Both the government and private agencies provide services for special groups within the community. Special programs exist for youth,. elderly, the handicapped, persons with family problems, the unemployed and those need- ing other types of assistance. As part of this planning program, the City has as- signed to Johnson County Regional Planning Commission the task of .preparing 'a '?numan'services plan that will assure that human services are provided with efficiency ' and dignity to anyone in need. LAND USE The principal land uses in Iowa City are agricultural (38%), low density residential (14%), streets and railroads (12%), public and semi-public uses (12%), the University of Iowa (10%), and vacant land (6%). High density residential, commercial, industrial areas and water (2% each) make up only a small part of our City. One third of the land AGE -SEX DISTRIBUTION' 1970 planniog is now rano uscn a I � .n_ - • community. In general, land uses have spe- cific locational requirements. For example, a grocery store needs a population nearby large enough to support. it, easy access to and from the population and a location not in intense competition with other grocery stores. In a similar manner people prefer to live in residences convenient to their daily, activities, yet protected from traffic, unsightly views and pollution. Another very important aspect of land use planning is concerned with protecting resi- dential areas from the negative effects of highways, commercial areas and factories. The effect of an intense activity.upon a resi- dential area can, be minimized' through the use of landscaped buffers, separation by dis- tance and by requiring compact commercial development rather than strip development. AGE -SEX DISTRIBUTION: 1974 MALE (total: 23,582) E FEMALE (tetau 24,162) 30 20 10 . 0 10 20 30 • t'EIIC[NT• n !W-4 AGE MALE FEMALE (years) (told:22,7T0) _ (total: 24,060) end 75 395 883 over 6574 67 I,ny , I'M 1,364 55.64 .508 116 45.54 +oy.er xtr.r�.a 80IA1 t;reo 1,703 36.44 3,871 3,339 ss=s4 20.24 4,314 5,780 15.19 3,A92 5,581 1A AP93 /0 94 dweer 6-9 Intervals ij89 1,488 0.4 2,005 1,80Y 30 20 10 0 10 20 30 RItCtMT planniog is now rano uscn a I � .n_ - • community. In general, land uses have spe- cific locational requirements. For example, a grocery store needs a population nearby large enough to support. it, easy access to and from the population and a location not in intense competition with other grocery stores. In a similar manner people prefer to live in residences convenient to their daily, activities, yet protected from traffic, unsightly views and pollution. Another very important aspect of land use planning is concerned with protecting resi- dential areas from the negative effects of highways, commercial areas and factories. The effect of an intense activity.upon a resi- dential area can, be minimized' through the use of landscaped buffers, separation by dis- tance and by requiring compact commercial development rather than strip development. AGE -SEX DISTRIBUTION: 1974 MALE (total: 23,582) E FEMALE (tetau 24,162) 30 20 10 . 0 10 20 30 • t'EIIC[NT• n !W-4 F3 QUESTIONNAIRE GENERAL SURVEY FOR IOWA CITY PLAN The City Council, the City Manager, the City Planners—all of us—are working on y .. plan for Iowa City and its future. Avery difficult problem is to plan all the pans so that most people are pleased with the way things turn out. We are doing this survey to get ideas on what the people want the city to be. ' Actually, the first step in the citizen participation process was taken earlier this year when we distributed a Special Survey to about 250 residents of Iowa City. We asked them many very broad questions to see what they thought the important issues were In Iowa City. Since the 250 residents were chosen at random; their responses were a good representation of the total city population. These responses were used in preparing shit General Survey. The General Survey, then, is the secondstep in this cooperative process to include the public in the work of planning the city. There will be continued opportunities for you to contribute as the plan develops and those of us working on the plan look forward to your assistance. This survey is divided into two sections, and each section into several parts, in the following manner: > SECTION 1: YOUR HOME AND YOUR NEIGHBORHOOD Pon A: Where You Live Now Pan 8: What Is Important to You in Housing • Pon C: Your Neighborhood SECTION 11: IMPORTANT ISSUES -Pen A: Iowa City Growth ` Pen 8: Transportation Pan C: -Citizen Participation Pan D:,City Smicee :Pon E: Energy Conservation Part F : Human Needs end Somiw Pon G: Your Comments it may take some time to complete this suirvey, but the mlormation we reca w: will be very valuable in planning for our future end at nuking Iowa City what we all wont it to Mr. 'Thank you in, your conlw,+ron. SECTION 1: YOUR HOME AND WOUR NEIGHBORHOOD Pun A. Whore You Live Now j 1. Whet typo of building do you bve ul r ?Check or.1- I $mgrs: family 5. This question is concerned with gross income received in 1976. This includes salary, wages, earnings, fees received; income from investments, trusts and savings accounts; grants, gifts, and prizes if you control how they are used. It does not include the value of a scholarship covering room, boa!d and tuition, for example, since you do not control how it is spent. For yourself and each person in your household, place an X in the , appropriate space. ��,�p rnwi Inxn rnww Mi $0 to $999 S 1,000 to $2,999 $3,000 to $4,999 $5,000 to $7,499 $7,500 to $9,999 $10,000 to $14,999 615,000 to $24,999 $25,000 to $34,999 $35,nM in $49.999 6. What is your major occupation? (Place an 'X in the appropoale space. ) Student Retired Homemaker AyrII:UIIUCaI Construction nn,InIrIJPnnnl[J 1 O i1JyI1111Ii1h 1111 i (,ip1n111111nt:JIlU1p m II1n111rt' Whptt•sair nr 11,11111 nodl. ( i Finance 4--a Part A Where.You Live Now;, 1i:Whattypeofbuildingdoyoulive in? (Check one.) Single-family Duplex Apartment building Mobile home Dormitory Other (what?) building, the rest of the building is (check one): 2.. If your personal flying quarters take up only part1building.. Resi Comm Residential and c Ot Personal living quarters take up the entir 3. Howmany years have you lived in Iowa City? 4. Your response to the questions above indicates the nature of < your household. A household consists of one or more persons, who may or may not be related, who occupy a single room or group of rooms (living quarters) which constitute a housing unit. People in a household live together in some manner—usually as a family, as roommates, or as boarders. Please answer the questions below for yoursed and for each person in your household, Others in your hou>;ehofd are designated PERSON N2, PERSON 3 and so forth. If there are more people in your 'household than there are spaces below, squeeze in the answers on the side: Put an X in the appropriate space for each person in your household. YOU 2 3� 4~ 5 6� Sex: Mate Female Age: Oto 4years 5 to 19 years 20 to 24 years 25 to 44 years 45 to 64 years 65 and over • 'Highest grade completed: 8th gristle or less Some high school High school graduate snmr. college College graduate Master's angrnrt Doctorate assassass anu acturing, 'Transportation Communications or utilities Wholesale or retail trade Finance .. Insurance or real estate Business or repair services Personal services. Health or medical services Education Public administration Other (what?) 7. How many bedrooms does your household have? S. How many bathrooms does your household have? 9. The living quarters for your household consist of the following rooms (check all that apply):. Living room Combined living room and dining room' Dining room Kitchen Basement Other rooms 10. If you have a yard, Is it (check one): For your household only Shared with others not in your household Do -not have a yard 11. Do you rent or own your home?;ICheck one.) Renting' Buying Own ( house paid forl 12. The monthly rent or mortgage payment (including taxes andinsurance)foryour household is(check one): Less than 6100' 0110010 6199 6200 to.6299 6300 to 6399 6400 to 6499 6500 or more 3. Check the amount you pard for utilities (excluding folephone) for Match, 1977: -Lass then 450 f $50 to $99 00010$1% )200 or more None linoluded In rent) J 14. How many motor vehicles are therein your household? 16. Of the motor vehicles in your household, how many are normally parked in the street? 16. On the following map of Iowa City, put an X to show where you live. If you would prefer to live in another area of Iowa City, circle that location on the map. Im ` IIOOIM.M e[ X. e MIM C 3 A HIOH SCHOOLS HOSPITALS UNIVERSRT or IOWA Nuieec.a'. WVTOWN. ETC IOHM 0 'INDUSTRY ��J pen 8: What a Important to YOU In Huuaing 1. ,What mme INWAUleb ale most puhU,tmt, it, ae!ofybin vin housing ra eds7 Put a 1 in the bog tar the most tmpnrteot, 82 in the bog for the second most Imlx3nant, a 9142 1lie 'third most important Cost {�1I'+M'�1 bll,i tIH,llitl,\I IIUI111111,M' 2, Traditional single-family housing eosts are very high' and constantly rising; in addition, such housing requires a lot of space and costly services. The following is a comparison of approximate costs for 3 -bedroom, single-family houses with garages: TRADITIONAL GARDEN TOWNHOUSE NOOSEOUSE r Louieo 9ADID.0t. - 3.600.01. 2.000 $0.11. C. I ImpIrovotl lel $10.000 16.000 113.00 I rout cost H5.000 WADo,. .$342.00 Aside from the obvious initial savings and reduced mortgage costs for the garden homes and townhouses, there are other savings to the homeowner and the city as follows: energy conservation, maintenance costs, cost of services (less road to build and maintain, shorter garbage routes, lower utility installation and maintenance costs.) Do you think single-family residential neighborhoods vas N should include well-designed: Townhouses Garden homes 11 3, Would you consider purchasing: ' YES NU A townhouse A golden home y 4. In the Special Survey, some people indicated that f they would like to have a grocery store and a drug- store within walking distance of their homes; others stated that even small stores of this type would dis- turb the residential quality of the neighborhood. ] In your opinion, should residential neighborhoods: YES NO Exclude all commercial areas Include small convenience stores and offices designed to sPrvP the neighborhnnd nnly Allow large shopping malls, appropriately deigned F5_11 You had the choice, how close would you like your residence to be Ib to the following facilities? (Place an Xinthe appfopriatebox.) M.n11, bloc$. blueMs ,Mw. Grade schnnl Hitch srhnol Gmcstela Drufu gstore or3�- stnr�s d' . a 2 i the box for Ura second most Important, a 3 for the YES third most important. rent or housing cost for: .. , Cost ... Privacy and freedom from noise s PrODCrmlty to facilities, services, aEr N-111 .: y peaf.neighborIt dandneighbors Type Size of housing unit A larger house Housing design - _ Size of yard r Parking d' 2. Would you be willing to pay more than you do now in YES poor rent or housing cost for: .. , 4 ... - A better location s . : A larger yard A larger house Additional amenities (garage, oft•street parking, etc.) r balcony, better construction, -'3. If it would lower your rent or housing costs, would you be satisfied with: _ YES A less convenient location Asmaller yard A smaller house �..,. Fewer amenities 4. In order to reduce housing costs, would you be yES e _ willing to live In the following housing types: Condominium (no yard, but shared open space) ' Cluster development or Sarden home (small yard and shared open space) r Townhousedurilex aand hor shared ad log units with pen spat 1 lllyard area Part C: your Neighborhood the Special t, one of the chief areas of concern indicate m - - Survey was the high cost of housing. Additionally, many people commented that they did not like apartment F - buildings mixed in with single-family housing.'Whichdo ynu'think is the best way to provide new multi -family housing? fChackone.) f' All new multi.laAIy housing should be concentrated In multi -story (812 story) buildings adjacent to the _ omenta' Bt><•' Distrim kSame as above, but with 4 7 story buildings Now smell multi•tamlly (three story) complexes should be scattered throughout the City. Including eyitting amps of sinllle-family housing Newmulti•famiW contipwnt:snuulu tx cwrfilwd to large4cale deveioPfwltb No opinion Drugstore Other stores Gas station Playground or park Library City bus stop Cambus bus stop Highway Apartment building Mobile home court Industry Place of employment Office park Other (what?) SECTION II: IMPORTANT ISSUES Part A: Iowa City Growth 1. How do you perceive Iowa City? (Check one.) Small town Large town City` Metropolitan area 2. In what ways do the following ' factors shape your perception of of Iowa City? (Place an X in the appropriate box.) University Type of people Size of city Stores Restaurants Bars Surrounding agricultural area Industry Hospitals Residential areas City design Schools Recreational opportunities Libraries Cultural npportunities "0q police . Creme% , Doeanl good really' Imprauion meed creerea , poor 4 ImpreeAon s r 3. How do you like Iowa City ase place to live i !Chock one. ) Like very much Like ()key i Dislike tl Very mueh dislMe 1 4. What do you think of the physical growth (development and annexation) that has taken place in Iowa City since Your tax dollars pay for all or part of the following services: 1960? (Check one.) 1. Which of these additional projects should be funded by the city if money is available? IPlace an X in the appropriate box.l Stronglyapprove m 6 Approve o" z � Co a m d No opinion Purchasing housing for the elderly Disapprove Strongly disapprove S. Iowa City's population grew about 40 percent in the decade from 1960 to 1970. Since then, growth has been `- more moderate. Projections beyond the year 2000 show that an increase in the growth rate is again possible. In your opinion, Iowa City should (check one), Remain as it is now, as much as possible Improving Iowa River and riverbank Continue to grow, but at a moderate rate Seek to grow larger at an increased rate Let growth occur naturally—do nothing to interfere 6. if Iowa City does grow, the city can act to direct this growth somewhat, both physically and in terms of job opportunities. Provision of utilities (especially sewers)„ road construction, zoning and tax incentives are examples Of ways in which the city can control the direction and nature of growth. Section 6 of this guide shows advantages and disadvantages of possible alternatives for development patterns within Iowa City. In your opinion, new development in Iowa City should take the form of (check one): Conserving natural areas Cultural activities lother than "Sprawl" "Core" "Multi -cote" "Natural" No opinion 7. Do you feel that the following would be aceePtable ways of maintaining economic health in lows City? Attract University -oriented industry (e.g., data processing) YES NO Attract medically oriented industry (e.g., pharmucaulical) Amact other NAfa indu:rry (a.g., loo Jnc ow srwp; Attract heavy industry le,g., food p roues r ngl Part 8: Transportation UM! Part D: city Services Your tax dollars pay for all or part of the following services: Police and fire protection, parks and recreation facilities, road ". cleaning and snow removal, library, animal shelter, water and sewer service, bus service, and garbage collection. 1. Which of these additional projects should be funded by the city if money is available? IPlace an X in the appropriate box.l w I:a z O m 6 z g 2 n o z o" z � Co a m d z' s t z W Purchasing housing for the elderly Improving Iowa River and riverbank Conserving natural areas Cultural activities lother than University sponsored) Recycling programs _ Historic preservation Low-interest loans for housing rehabilitation Low-interest loans for home insulation Ralston Creek flood control Additional recreation facilities Expanded library services 2. Would you he willing to pay more for existing services in order to fund one or more of the projects listed above? YES NO 9. Should the following facilities be available lo fUwe City Tt 5iderrf ar !ho library or other community buildings? ES NO NO OPINION Large meeting rooms for community gmups and programs. performances Small nu�nrin(I H rnnlarence moms for 111,,1-.tttr,­ ; ... ,,•.,nAir. Display areas for work of local artists and craftsmen 1%%dia production facirtias it.g., drymounting, dariroom, slides, aam. video and audio recording, r f.i S y r sAttract heavy industry (e.g.,, food processing). _ Part 8: Transportation J.. Would these changes in service encourage your use ; Of the bus? YES NO A bus stop,closer to your residence Evening service More routes 't More punctual service More frequent service I would never ride the bus, 2. In order to encourage alternate modes of transportation, does Iowa City need more: YES NO Bikeways Sidewalks 3. Parking at shopping centers is usually provided "free" 10 all customers, Actually, the cost of building and maintaining the parking lot must be passed on to the customers in terms of increased prices or absorbed by the merchants. In downtown Iowa City, the cost of parking can be paid for by the businesses downtown through a "Park & Shop" program, or by the people who park their cars downtown (by paying. a fee or meters). Which do you prefer? (Check one.) Park 8 Shop Parkers pay 4. Residential parking on city streets (check one): Should be just as it is now Should be restricted at all times to parking for residents only Should he increased by converting side streets into small landscaped parking bays Part C:Citizen Participation 1. "Citizen participation" means having citizens like you participate in setting goals and making recommendations. Do you feel that your participation in the following areas isnecessary7 (Put ar�1K the a?�•^NmtpboxA Determining long-range goals for Iowa City YES NO UNDECIDED .. _...._..._.� Responding to propnsnlr. from IOP airy ilnvenmlant fill signifirant actions FarbVpab+rg Ai b HbighbUrhu<1'7 improvement group onset lent, ellacting your neighborhood ' 4 lI1 Eslabbsningane;ghborho^!! improvement group I Display areas for work of focal artists and craftsmen Media production facilities (e.g., dry mounting, darkroom, slides, signs, vidoo and audio racordino, typewriters, photocopies, etc.) Media preview facilities (e.g., audio Ef video recordings, Barra ft 16mm films, filmstrips, slides, television, etc.) Downtown lounge areas for resting, reading, restrooms, waiting, eta Part E: Energy Conservation The cosf of all types of fuel has risen sharply over the past few years and is likely to continue to do so because of constantly increasing use and diminishing supplies. The risk of energy shortages has made it necessary for all citizens to conserve energy; this will mean some additional costs initially as well as changes in lifestyle, 1. In your opinion, should the city undertake or support the following energy conservation measures? YES NO NOOPINION Recycling of waste materials Home insulation improvement programs Energy-efficient construction - requirements Solar heating programs Tax on automobile use Tax on large cars only Incentives for mutti-family or cluster ..<i developments. 2. Would you be willing to pursue the following energy conservation measures? YES NO Improving the insulou. n In your home If low-interest lob is are available Improving the ?nutation in your home if low-interest loans are not available Installation of a solar system If Inw-interest, loans are available . Installation of a solar system it low-interest loans are not available Saving and separating waste materials P: (paper, bnitlas, cansl lot recycling program It 1 pick up slit vicoF ate provided t Saving mild separating waste nurtenais (paper, F but ties, calls) tor' recycling pmglint If you are tdsounsible for delivery of materials to a recycling center Day care for children Day care for elderly or disabled Relief substitute care for families with r members needing constant care Counseling Homemaker services Services to elderly living along r (shopping, visiting, etc, I Foster tare Group home care (for children, for former mental patients, halt -way houw ) Information and assistance in getting services 2. R you Or someone you know hes o _ 3. What age groups do'you think need attention in planning 5z for new or improved services in this community? Rank the heddifficultyInobtaining anne01 ones you select in order of importance by putting a T in the , box for the most important, a 2 for second most t R Part F: Human Needs and Services Ntove services, please write the I Because of the complex structure of human services involving - - federal, state, and local agencies, some groups or areas of need may Young adults serocefalif)tfwblink(s)belovw not receive the attention they require. 6 a 2 n o - 1. Do you think that the following O r r services need improvement or z z z - - expansion? (Place an X in the W m z m W ptarang an X in filo alMunta;nrra - .. Appropriate box.) r a n a ~ z c z m o W O W W 6 o m W box. r Job training for people with _ special problems Joblocation for youth orother -. special groups :. Emergency financial or material help - for people in crisis situation , - Deliquency prevention and treatment measures Rehabilitation programs Day care for children Day care for elderly or disabled Relief substitute care for families with r members needing constant care Counseling Homemaker services Services to elderly living along r (shopping, visiting, etc, I Foster tare Group home care (for children, for former mental patients, halt -way houw ) Information and assistance in getting services 2. R you Or someone you know hes o _ 3. What age groups do'you think need attention in planning 5z for new or improved services in this community? Rank the heddifficultyInobtaining anne01 ones you select in order of importance by putting a T in the , box for the most important, a 2 for second most t R .J Ntove services, please write the T Junior and senior high school children 16 Young adults serocefalif)tfwblink(s)belovw Middleaged 6 a 2 eon indicate the difficulty by r -F j - ptarang an X in filo alMunta;nrra F c box. q, What groups of people do you think need attention in planning new or improved services in the community? Rank the ones you would select in order of importance by putting a 1 in the box for the most important, etc. Chronically ill, Physically or mentally handicapped Mentally or emotionally ill Alcoholics, drug -dependent - Low-income individuals or families Transients S. In whet ways would you he willing to help pay to improve or establish a service needed by your family or others in the community? (Check all that apply.) Fees Taxes Donation to agencies providing services - Cannot pay Am not willing to pay Part G: your Comments 1. Think of the things we've discussed in this questionnalre, Now think of the things we didn't discuss, but which you think are unponam tui Iowa CIIY _ Of a/.r ?frau' things, who: arc the three most important issues facing Iowa City today? The most Important is 1 The second most important is - �I The thud most unportant ro 2. II you htwc any cnnvnams. plaasn voile them he1�w ' OPER I �ueur[ vOU FOR YOUR COOPQRATIONI 1 3. What age groups do'you think need attention in planning for new or improved services in this community? Rank the ones you select in order of importance by putting a T in the , box for the most important, a 2 for second most t important, and so forth. .J - Preschool children Grade school children Junior and senior high school children `. Young adults XF Middleaged Elderly q, What groups of people do you think need attention in planning new or improved services in the community? Rank the ones you would select in order of importance by putting a 1 in the box for the most important, etc. Chronically ill, Physically or mentally handicapped Mentally or emotionally ill Alcoholics, drug -dependent - Low-income individuals or families Transients S. In whet ways would you he willing to help pay to improve or establish a service needed by your family or others in the community? (Check all that apply.) Fees Taxes Donation to agencies providing services - Cannot pay Am not willing to pay Part G: your Comments 1. Think of the things we've discussed in this questionnalre, Now think of the things we didn't discuss, but which you think are unponam tui Iowa CIIY _ Of a/.r ?frau' things, who: arc the three most important issues facing Iowa City today? The most Important is 1 The second most important is - �I The thud most unportant ro 2. II you htwc any cnnvnams. plaasn voile them he1�w ' OPER I �ueur[ vOU FOR YOUR COOPQRATIONI ■. —rolaNEW— — — — — — — — — — L FIRST CLASS Permit No. 775 Iowa City, Iowa 67240 BUSINESS REPLY MAIL No Postage Stamp Necessary If Mailed In The United States Postage Will Be Paid By CITY OF IOWA CITY DEPARTMENT OF COMMUNITY DEVELOPMENT IOWA CITY, IOWA 62240 I COMMENTS F rola i' TRAFFICWAYS In a medium-sized city such as Iowa City, streets and roads form a network on which all types of transportation must depend. Autos, buses, trucks, bicycles and pedestri- ns can move safely and efficiently only here good streets and sidewalks are pro- N U POSSIBLE ROCK ISLAN CORRIDOR vided. In planning for trafficways the princi= pal concerns are efficiency, safety and envi- ronmental quality. The problems that exist with our present trafficways include congestion at the river crossings, inadequate cross-town arterial streets, under utilikdtion of bus capacity at certain times, and disruption of residential areas. Problems projected to occur within the next 20 years include increased conges- tion on Highway 1, US 6.and US 218,'and, at major intersections. Several alternatives to solve or reduce these prpblems exist.' For instance, riding the bus reduces the number of vehicles on the street and is twice as energy efficient as ,driving a car. Other alternatives are possible major street'proj- ects including: 1) the widening of two4ane sections of Highway 1, 2) the construction of US 518 to serve as a west by-pass for Iowa City; 3) the construction of a new four -lane street from 1st Avenue in Coialville to down- town Iowa City generally along the northside of the Rock Island Railroad and 4) the con- struction of Scott Boulevard to serve as an east by-pass of Iowa City. 0 A r■ POSSIBLE SCOTT BOULEVARD CORRIDOR M CITIZEN DARTICIPATION As part of the 10181 citi7l+n participation Proem of the planning grog Turn, the city conducted a random sample survey of ap POSSIBLE US 518 CO Proximately 230 households earlier this year. The response from this survey was very good; most people filled out the lengthy survey and added comments concerning what they wanted to see Iowa City become. Concerns. most frequently expressed in the survey responses included the following: 1) Housing costs are too high; 2) We need to maintain the existing character of Iowa City; .3) We need to do something about urban renewal; 4) Parking is a problem; and 5) Neighborhoods need to be protected from traffic and commercial development. This general survey is particularly con- cerned with items 1, 2, 4, and 5 above. Item 3, urban renewal, has received considerable citizen input already and as a result signifi- cant activities are now taLing piace. A gen eral plan for urban renewal land has bean es- tablished and this land will be offered for sale before the end of May and is expected to be sold before 3oplentbor The run Uuctiun of an open -aa, landscaped rnalr along Goltagle Street uum of Clinton, rind landscape im provernents to Dubuque Street south of Washington will begin ur June and be com pleted as quickly as the weather permits Downtown _Iowa City will soon be an attrac- tive blend of the old and the new. ENVIRONMENT The original prairie and woodland vegeta- tion of the area has been largely replaced by urban development and agriculture. Even with the lawns, gardens and trees which ac- comdanied much of Iowa City's growth, many of the self-regulating processes of a healthy, diverse and stable natural environ- ment have been lost. Some of the problems 'which have occurred include the devastating effect of the Dutch Eim disease, air and noise pollution, and the loss of all vegetation to large unbroken parking lots. As part of this planning program it was determined by the Comprehensive Plan Co- ordinating Committee 1CPCQ that something Could be done to correct these problems be- rms the environment -was further degraded The CPCC held public r neadngs and after con- slderable discussion a Tree Planting Plan end an Ordinance were adopted by City Council. The Plan end the Ordinance require trees to be planted with most development and re- development to assure that the environment is protected and natural processes continue, and so that storm runoff, air pollution, noise, dust, glare and excessive heat are reduces.- A sound environment, however, is based on more than vegetation. Careful identifica- tion of steep slopes and flood plains will en able Iowa City residents to avoid structural problems, flooding and inappropriate build- ing sites. Additionally, environmerital infor- mation such as tree cover, agricultural pro- ductivity and soil type can be used to assure appropriate land usage. �y i SE4SONAL SHADING Trams control i~r1r .Kslure by rah _ ov solar radistion, by absorbing energy through life processes and by conducting excess energy to the air and the earth. On a sunny day with a 29° C (64" F),pir temperature, a tree -shaded surface can be expocled to be approxi mately 11° C (20° P) confer than an unshaded Miriam. U01 to this. ef!,rr_' ca'. !x• used to errs erlogY h•, reducing or eliminating air conditioning needs. Deciduous trees make very effective solar screens in that they provider seasonal adaptation. Tfeer, leer out in the lata spring, providing snteclawd just as it is nrerrlexl, .■ fgm♦ s n notrx FU SOLAR SCREEN and d,, a similar men. . lase Havre in the autumn jus! as it is desirable to have the sun's warming rays corn- ing through (see Drawing A). A solar screen for a one to two-story building locatwd in lows -City should consist of several foes -growing hese- approximately three (3) meter 19.64 feeo w twrgW pwilita hw: Iw nmlwt, t Ib.4 Iwh Iron, the strWG. lure end five (6) maters 116.4 feet) open on the south and snuthwast sides of the buildinn. As the trees grow Ihoy should Ixnrm to Inoviriv an effective Satin srarr:•e: within eyrhl tv Ivo yvats ism! Diumna 6). o lure and five 15) rnetees (16.41cet) apart on the south The CPCC held public meetings and after con- reducing o1 rliminatine air conditioning needs. siderable discussion a Tree Planting Plan and Deciduous trlaes nlilke vcxy erfecevr. sola, !:crams in awl f11Uh y110Li1�r 1111311) es of `,`,"`imvic "an nfi cliv y` I:S an Ordinance were adopted by City Council. that they provide seasonal adaptation. Trees lent out v The Plan and'the Ordinance require trees to in the late spring, providing shading just as it is needed, screen within eight to ten years isee Drawing 3). ECONOMICS The economy of Iowa City is different from that of other cities in Iowa. Iowa City is an educational, medical, retail arid service cen- ter with a relatively small proportion of am- ployrnent to manutactunng, wholesale and agricultural sectors. Several other unique characteristics of our economy include: 1) 469/[, of the lahot turce Is furnair, Itl1e hjgF1- est Percernaue in Iowa), 2) nearly half of the work force is employed by government, 3) eOucauunal levels are above average for tfu-'�.rnc fond towel but Mw ut 1111, highw-'i educellonal levels If Till; 11"110111, 0110 4� ur. emph,vnuant ie consngnnlly Inw. ., ... f1w. o'l rlt IoVq- City's unique economy and population. For cities this size, Iowa City leas a high personal income, higher then expected sales/popula- tion for eating and drinking places, apparel and accessory stores, drug stores and gas stations and lower than expected sales/pop& ulation for food stores, automobile dealer and furniture arid hunle furnishing establish merits. Inwe City's future economic health de- pends on the continued Importance of the university and the hospitals. It Iowa city's population expands as expected, it is possi- ble either to encourage increased speclalr wa! ht-alth r:Hr(- ^' tC' rAver;iry the economy by attracting Coln panni", that t;ould make use o1 the well 1-1111 rfrnh I:Ihnr floor 1111111 COMMUNITY FACILITIES Parks, schools, libraries, fire stations and other public uses are an important part of Iowa City. Public uses are located through- •out Iowa City, Parks and schools are, for the most part, located in residential areas, fire stations are located so that trunks can quickly arrive at any lot and the library and recreation center are centrally located. P(oblerns which have been Identified con canning comrnunity facilities include 1) in sufficient grid pnolly riiraributed nark yfo, (the twri mHIM parks are located it, thr- north area of ttlt. coy), 11 ovterc rnw.lii n n in oull;"in(I grade St:i +trot!, and rnl•. r-n:,iip� stu nr•u!s t,u centrally located schools, 3) insufficient space and facilities in the existing library, 4) the possible need for a northeast fire sta- tion to serve new development, 5) insufficient space and facilities for police and administra- tive offices and 6) the need for increased Protection of airport approaches. V"Iv park a,)� srat nil Situ ;!uuld br, linked TO residential areas by greenways separate f nom auto Gaftw, and should have ex,tansive seen'.. enjoyment as well at arlrvl- recreation. I,nnrly rieveloped park and school site'. pro I, 1n1J ;, 'I". „r .Iu UTILITIES I ir:etra ,+Jilt, and water unhtret: provide the cation, recreation, cultural activities, meeting Places and community activities. Such facil- ities get the most from each tax dollar. 1,, tx. plunneo weli In anvance to avolcl costly recunUtrut•'llor; a± tvidw?wIt'l Iinys Of till the utilities the most complicated to build and IIItf111taln 15 the sallitary sower, Iowa City is located pritnarily alongs three �J 1 Glry hie. oas "I'd water utilities provide the power and water needed for our everyday living. Sanitary and storm sewers are neces- sary to carry off waste material and rainfall which is not absorbed by the ground. The tel- ephone company provides an energy efficient link to people everywhere. Futhermore, utili- ties are locational criteria for most urban land uses. Without utilities of certain capacity or location some land uses cannot occur. Utilities are the hidden investment of the city and private companies. Wd seldom notice them unless they malfunction. Utilities are expensive to build and operate and need utilities the most complicated to build and maintain is the sanitary sewer . Iowa City is located ptirnarily along three streams—the Iowa River, Ralston Creek and Willow Creek. Because the sanitary sewer works by gravity, sewer lines ideally should closely parallel stream valleys to carry waste water to the treatment plant. Pumping waste water uphill is expensive and wastes energy. Due to the unique characteristics of the two small creek watersheds and the Iowa River basin, sufficient capacity exists or can easily be constructed within these areas to serve 20,000 additional people. For this rea- son, Iowa City's future growth will be most efficient within these areas. 11 I HOUSING The character of the fiousing in Iowa City is closely related to a high percentage of stu- dents in the population. Forty percent of the housing was built before 1940, 20% was built between 1940 and 1960, and the remaining 40% has been built since 1960. Over half -(54%1 of -the -housing is renter -occupied and rental housing has been characterized by an extremely low vacancy rate and relatively high density and dispersion throughout the city. Owner -occupied housing has been Characterized by turnover lower than the national average and relatively low density and distribution which Increases with distance from the city center. - It has been projected that if future housing needs are to, be ntet, epproxinu$tely 310 dwelling -units per year will need to he built until the year 2060 in orderto provide for ex- perctad population growth and smaller houw- holds. One of the significant factors in hous- 1ua m "r h.. nurrom end exported decrease In HOUSINGDESIGN ations. The citizen participation process has indicated a particularly great concern for housing cost, quality and livability. One thing planners and other city officials can do to reduce housing cost is'to change outdated zoning provisions a6d building codes to allow innovativehousingdesign. This would save money for homebuyers and tax- payers. As an example, current standards for minimum lot width result in longer streets and Utility lines than necessary, a cost we pay for when we purchase a house and when we pay taxes for street maintenance. The garden home in particular is analternative which maintains the character of Iowa City while minimizing the'street and utility costs .associated with traditional residential devel- opment. A typical 65 -foot (20 meter) wide lot can be reduced to 41 feet (12.5 meters) and easily maintain an 8 -foot (2.5 meter) side yard between houses, if one building wall is L_.J L TIAnMONA19UeUIVIMON -71 r on one property line. The savings can be significant; ,it would be possible to build a comfortable garden home for approximately $37,000 as opposed to $45,000 for a new three-bedroom house (a 17% savings). Fur- ther savings could be accomplished. by town- house development. In a similar manner, apartment costs can reduced by lowering the land cost per dwa ling unit. This is done by increasing the den- sity of apartment projects. By placing high density apartment complexes near downtown, the university bampus, or other areas of high Pedestrian activity, the dependency on auto- mobiles would be minimized and parking and traffic problems would decrease throughout the city. However, this type of solution re- quires careful planning. Housing cost can be reduced while main-. I taining the quality of housing and the charac- ter of Iowa City. QANPrN HAMI aI!/!.pu; !$Iryy r Owelllllg UIIILb pCl yUdj Will ItCCU w uc UU111 until the year 2000 in order to provide for ex- pected population growth and smaller house- holds. One of the significant factors in hous- ing is the current and expected decrease in average persons per dwelling unit. Average household size has decreased from 3.0 per- sons/dwelling unit in 1950, to .2.9 in 1960 and 2.7 in 1970. It is expected that average household size by the year 2000 may be as low as 2.3 persons/dwelling unit. Decreasing family size and rising housing costs create the need for new types of hous- ing. Two-story garden homes constructed on smaller lots with common open space can help reduce housing costs and eliminate wasted yard area. Other housing alternatives such as townhouses and condominiums may gain favor with changing family requirements. Housing design is an area where many dif- ferent considerations all come together on a very personal level. Housing cost, size, loca- tion, utilities, street design, parking, and en- vironmental quality are all essential consider - GARDEN HOME COURTYARD Gbrticu limned [ n pnrv.M u.ceVoonel leenn, mgr.,, , s11,01 arab. as tlbe. a ties welUendscaped. Prsear Vnurtyar i r TRADITIONAL SUBDIVISION sx rARDCN HOME The drawings above illustrate the traditional and garden home The current answer tc Inwcnst hnilaion is mohile b.n.nns 'Wth methods of laying out streets and lots. They both contain the same innovative design, financing and construction techniques town. number of single family lots, but the garden home method provides houses could be price competitive. 41 a great deal of common open space lin orange) and one third less area devoted to shoals. LOWCOST HOUSING MOBILE HOMES ,rw� __ — � t •.�_.� q -'_ate:`. �a 4W a ■ Ill ■ TOWNHOUSES 'HI -RISE APARTMENTBUILDING How 1811 Newld alMrnrrrMl building, bu to nI kr will, Iowa City, Twenty stasn' 1wMw Stories Sight stduu,, four stenos da,% n marine? SITE PLAINS FIGURE 10 APARTMENT BUILDING DESIGN These plans for liner story epartmenl buildings illustrate good design. Building A provides ample balconies for outdoor Irving, and noise burping through the use of closers and baths on shared walls. Building 8 provides ample deck meas, total lateral separation of units, and a propmssion of public to private spaces on the cornnlon em ry decL A t r 0 J'yerns: K� IM A '^' I,IN �kry .�.. n¢ nkIt.rvnto HOUSING DESIGN CRITERIA. Good housing design it a banehf to the commalnip in gnnrpol Nor only pairs It help people to live comfortably and if a pleasant environment, but h can help to redact housing dotefic ra tion, enerlly waste, end psy ir,010 icer attest, A Cirri sumnlall ni era,n gwdrbni 1.,: g:,f,r hnu;:u,b .1t, ijp lollnws Pnver,y 1b ,'"01111i lu good 6oue.rn{I duelgn Prlvar;{ may tu• ( olmrinual serudly visual fwlva'v ane frn«dnm flion, Invvanl ea uulfx Ir in, bran. t:n, a,Nn rod! If Pru1,11i"1011 VI public to private spaces in residential areas lowers crime and inae6sSs social increraation. Court erases in multi family housing or stressed open space for all types of residences serve this purpose. Additionally, entry nooks, front parches, or stoops reinforce the pattern of public, s!^Tt aurdu stn. 1011clit 41-d tlnnu afMcVs, In frulb-lamily housing, .rove buffering between units is essential for resident eornlan and lasg4onin viability, Rufferino hetwenn unit•: can tai arromphshed by sound msulahorr fire walls '•dead" air space, of by placing .•h.dr'L. heprG d' d.1 k gCylPr 4 M • CMnmCa' n'tl11D Craung equitable pnvatr outdoor envitore.wnb fa aNr d,ryefiti % anergy eHlcies+t kl that it reduaas the dated for wilbure auto trills, with casualty open effects, fooden s qn put" outdoor acttwtwa wdi out havrq to dn". Silvia. fami dwedingc should iter Aefi({nad to ptoviek an o tttftla Wires ares thal 16 an aatrrlsbn of Ilvlow kw* apses. In 10 t w 1H J! ; V...: CITY CHOICES The City Plan will be a guide for Iowa City's future. The,levelopment of the plan will re- quire careful'evaluation of the alternatives for the future, and it will require decisions to be made concerning what we can do, what the priorities will be and what we will be un- able to do. That is why we need your help to make the plan a fair representation of the dif- ferent and sometimes conflicting needs and interests of all residents of Iowa City. Growth, and Annexation. Currently, :Iowa City's population is growing slowly and within the city limits there are large agricul- tural areas. New sugdivisions are being built just outside the city limits. Should these areas be part of the city? Do we want Iowa City to continue to grow? Unlimited growth could destroy the present character of Iowa City. If 'Iowa City grows, how should it grow? Annexation of land to the city would give the city more control of how and when growth occurs and assure that all that bene- fit from city services pay their fair share. Concentrating growth in -the downtown area would protect woodlands and farms, but would change the way we live, Transportation. Since World War II we 'have depended on private autos for most of our transportation. The result Etas been in creased congestion, the loss of old buildings to parking lots, air pollution and the building and widening of streets tlo accommodate all the care. This hes been ancompaniod by in creased rwtsonul futedorri of utovoismitt, to w...-ftel mrm.rd lintats mud try Neighborhoods. Iowa City was once a small town where people knew most every- one else. As Iowa City has grown, it has lost some of its small town atmosphere. This small-town atmosphere can be recaptured by planning for neighborhood -oriented schools, parks and shopping. As they stimulate per- sonal interaction, neighborhoods within a city the size of Iowa City can create isolated small groups, separated from the rest of the community by neighborhood interests. Is this what we want, or do we want to live in one big town? As you can see, all these choices are inter- related- Choices are difficult to make, partic- ularly when so'many people are involved. What is viewed as desirable by some ma seem is or even wrong to others. That is why we need your assistance—in fil- ling out this questionnaire, in attending pub- ' lic meetings as the plan is developed and in your continued interest in your community to make sure your concerns are expressed. Without you the plan will not be as good as it could be, DEVELOPMENT ALTERNATIVES :7 8PRAWL. It the ehy were to develop In this manner, individual choice would be unlimited, but apticultural land end wnodlantin would Ir+ Inas. onatpy would la? wasted. pdrticularly it, oanApooatwo, slid Iowa LIly w 00 hao~y, ~.,W. 40 AIV! CORE. if the city were to develop In this way, Iowa City woulri Im it very ditlerwn place elan h is now MORI now dnvainpmmn would t; Au pleat oral the UntvatstW, downtown and hoepnalt.. People wauld b muey, h,Rw dratralwor Mt the mar. ''This ndta or I to parking lots, air pollution and the building and widening of streets to accommodate all the cars. This has been accompanied by in- creased personal freedom of movement, re- duced travelAlmes and convenience. In- creasing energy costs and dwindling fuel supplies may affect how we move around town. Cars,are convenient, but neighbor- hoods can be designed for transit, bicycles and pedestrians as well as cars. Should we plan for increased auto use or should we en- courage energy efficient transportation? Housing. Iowa City is characterized by single-family homes on spacious lots and rel- atively small apartment buildings scattered throughout the community. Housing costs are rising rapidly, but we want spacious dwellings and yards. Cluster housing can save cost and create shared open space as well as small private yards. What is more im- portant—cost or space? Apartments create parking problems when they,are scattered throughout the city; when they are located close to daily activities this problem is greatly reduced. Where should different types of housing be built? Energy. Most of our daily activities are powered by fossil .fuels. As costs increase we will either have to pay more or make do with less. Solar heat, wind power and ener- gy conservation will likely be part of our fu- ture as fossil fuels become more scarce. Iowa City can become more energy efficient by being a compact city, but is this too many people in too small a space? Other energy saving alternatives include recycling, less use of cars and better home design and insu- lation. Are we willing to make these sacri- fices if others do not? H mien servllcm. Presently people in need are cared for by both public and private agencies. This often leads to duplication of services and In some Instances needs nrn be- ing met, Taking care of those in need is Rn obligation of modern society. Do we do enough, or do we do too much? Should these services be provided by private or pub- lic gtrollps? "How should they be coordinated? SPRAWL. If the city were to develop in this manner, individual choice would be unlimited, but agricultural land and woodlands would be lost, energy would be wasted, particularly in transportation, and Iowa City would be a very expensive place to live. CORE. if the city were to develop in Crus way, rows City would be a very different place than it is now. Most new development would take place _near the . University, downtown and hospitals. People would be much less dependent on the car. This type of development would require new parks, schools, streets and sewers for the centeref town. MULTICORE. if the city were to develop with multiple core areas many of the existing intensively developed areas would be expended and new high Intensity uses would locate along major streets. This type of devel• opment has features of both sprawl and core, but it would be less expensive to implement. Cj NATURAL. If the city were to develop using natural features as a guide nearly all new.development would occur within the Ralston and Willow Creek watersheds. Green belts along streams and steep slopes would provide a continuous park system. Aspects of each of the other three types of development would be possible, at a moderate cost. - J*HiGH IN, 'T Will r "' y fA0D( RATE. INTC.NS11 y *-V LIM11 OF URBAN AREA I