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HomeMy WebLinkAbout1976-07-13 OrdinanceORDINANCE NO. AN ORDINANCE REGULATING THE RATE 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 1. PURPOSE. It is the purpose of this ordinance to establish maximum rates for the discharge of storm waters into the various watercourses Of the City for the purpose of promoting the health, safety and general welfare of the population 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. SECTION II. DEFINITIONS A. Storm Water Runoff. Water that results from precipitation which is not absorbed by soil or plant material. B. 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 storm 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. G. 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. I. Wet Bottom Storm Water Storage Area. A facility that contains a body of water and which accumulates excess storm water during periods when the restricted storm water runoff release rate is less than the storm water inflow rate. J. Control Structure. A facility constructed to regulate the volume of storm water runoff that is conveyed during a specific length of time. Ordinance No. _! • page 2 K. Positive Gravity Outlet A term used to describe the drainage of an area in a manner that will ensure complete removal of all surface water by means of natural gravity. L. Safe Storm Water Drainage Capacity The quantity of storm water 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. 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 manage- 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 developer 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 not complying with this ordinance. C. Any decision of the Director shall be pursuant to written specifica- 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 Hoard, provided that such person shall file in the office of the Director a written petition requesting such hearing and setting forth a brief statement of the grounds therefore. Upon receipt of such petition, the Director shall set a time and place for such hearing and shall give the Petitioner written notice thereof. At such hearing, the petitioner shall be given an opportunity to be heard and to show why such decision should be modified or Ordinance No. Page 3 �— • withdrawn. The hearing shall be commenced not later than thirt the date on which the petition was filed. Y (30) days after After such hearing, the Housing Appeals Board shall sustain, modify or with- draw the decision of the Director, depending upon its findings. The proceedings at such hearing, including the findings, 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 co every notice or order issued in connection with the matter. No hearing shapy ll be valid unless a majority of the Board is present and no decision at a hearing of 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 of 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 to this section shall not stay the effect of the Director's order unless so ordered by the HousingA pursuant 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 an commercial, industrial, institutional, governmental, utility or other development or redevelopment comprisinga Y gross a gross aggregate area of one (1) acre or more. The 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 hazzard, 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 REQUIREMENTS. A. Storm Water Release Rate. The controlled release rate of storm water runoff shall not 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 509 of the available storage volume. Such release rate shall be computed as a direct ratio of the areaof 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 based upon the proportion of the area being developed as compared to the entire watershed tributary to the proposed storage area. Where it can be demonstrated by the Developer that a higher storm water release rate will not be contrary to the purpose and intent of this ordinance and where such proposed release rate will not adversely affect properties in the down- stream portion of the watershed, the Director may permit such release rate to be used as deemed appropriate. Ordinance No. • Page 4 B. Excess Storm Water Passage • 1. An excess storm water passage shall be 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 capacity 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 restriction 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 shall 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. Determination 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 computerized Method for the Hydrologic Design of Culverts," I.H.R.B.P. HR -164 published by the Engineering Research Institute, Iowa State University, Ames, Iowa. Rossmiller 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 orderly 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 of 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 other 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 IX. DRY BOTTOM STORM WATER STORAGE AREAS A. Design Criteria. 1. Primary and Secondary Uses Dry bottom storm water storage areas shall be designed to serve a secondary r•irpose for recreation, open space, parking lot, or similar type of use th . will not be adversely affected by occasional intermittent flooding. Ordinance No. • Page 5 • 2. Drain System. A system of drains shall be provided to transport low flow storm water runoff through storage areas. Such drainage systems shall have a positive gravity outlet to a natural passage or storm drain with adequate capacity as described in Section VIII, subsection B. Multiple 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 (50 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. S. 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 sand 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 in 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 during any portion of the storm water storage cycle. Overflows for each storm water storage area shall be provided in the event a storm 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 drairs as required by Section IX.A.2. The following additional regulations shall apply: 1. Construction. The water surface area shall not exceed 1/10 of the tributary watershed. Minimum normal water depth shall be four (4) feet. If fish are to be used to keep the pond clean, at least 1/4 of the pond area shall have a minimum depth of ten (10) feet. Ordinance No. • Page 6 0 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 and 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 excess 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 accumulated sediment. Such facilities shall be provided with positive gravity outlets. SECTION XII. CONTROL IN EXCESS OF REQUIREMENTS. Provision of Control Exceeding Requirements In the event storm water runoff control can be provided in excess of the requirements of this ordinance and the benefit of such additional control would accrue to the City of Iowa City at large, the City may provide public participation in the increased cost of the control of storm water runoff in proportion to the additional benefits received. Ordinance No. Page 7 0 SECTION 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 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 and seconded by that the Ordinance be finally adopted, and upon roll call there were: AYES: NAYS: ABSENT: Balmer deProsse Foster Neuhauser Ferret Selzer Vevera ATTEST: City Clerk First Consideration _ Vote for passage: Second Consideration Vote for passage: Date of Publication Mayor Passed and approved this day of , 1976. n u PROPOSED STORM WATER MANAGEMENT ORDINANCE FOR IOWA CITY REVISED MAY 25, 1976 PREPARED BY Powers-willis and Associates Iowa City, Iowa 0 Lindley s Sons, Inc. Hinsdale, Illinois 0 //C STATEMENT op P11IL9S21'HY AND I;_ ,TrNT The basic philosophy of this ordinance affirms the storm water management concept which holds, as its goal, the elimination of the storage or transportation Of excess storm water in or through habitable structures. Methods used to implement this management concept are designed to apportion the liabilities and benefits of excess storm water to both dominant and servient land in an equitable manner; this occurs when the rate at which storm water runoff proceeds by gravity flow from high ground to low ground is decreased. Development of land with pavements and rooftops tends to accomplish just the opposite effect. In order to manage storm water runoff in a responsible manner during and following the improvement of a site with roofs and pavements, this ordinance requires that the particular development in question retain or =:tore a portion of the excess storm water runoff by restricting the rate at which it is discharged downstream. The parameters chosen to accomplish this purpose attempt to balance the advantages and disadvantages of storm water runoff in such a manner that dominant and servient land are treated in an equal manner. It is not the intent of this ordinance to remove areas from use for the sole Purpose of storing excess storm water. It is also not intended that land use be restricted but that ,r acceptable locations for the temporary storage of excess storm water runoff be provided. 14 ® CHAPTER __— • S'PO[L`1 WATER MANAGEMENT ORDINANCE AN UIZDINANCE REGULATII7G THE RAPE OFDISCHARGE OF STORM WATER RUNOFF'; SPECIFXING CRITERIA FOR DETERMINING RUNOFF RATES; ESTABLISHING D);'VELOPMF.NT STANDARDS OR THE TtIE CUNS'fRUC'CIOP1 OF RUNOFF CONTROL FACILITIES; SETTING FORTfi PROCEDURES AND PRESCRIBING PENALI4'I ES FOR THE VIOLATION OF THE ��p;r, I, LLSTRAT ION THEREOF ORDINANCE. SECTIONS: 1. Title 2. Purpose and Intent 3. Authority and Jurisdiction 4. Definitions 5. General Requirem�!ntS 6. Dry Bottom Storm Water Storage Areas 7. Wet Bottom Storm Water Storage Areas H. Miscellaneous Storm Water Storage Areas 9. Control in Excess of Requirements 10. Administration and Enforcement 11. Administrative Review 12. Violation and Penalty- 13. Separability Clause 14. Repeal of Conflicting Ordinances 15. Effective Date JOHNSON COUNTY, IOWA: BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF IOWA CITY, SECTION 1. TITLE 1.1 Title. This ordinance shall be known as and may be cited as the "Storm Iowa." water Management Ordinance of Iowa City, - - - SECTION 2. PURPOSF AND INTENT 2.1 purpose and Intent. It is the purpose of this ordinance to establish_maximum rates for the discharge of storm waters into the various watercourses of the 15 3.1 Authority. s The basis for establishing this ordinance. 3.2 Jurisdiction 1_ •c_tion The area covered by this ordinance includes not only the Ralston Creek watershed, but is applicable to the entire city. 4.3 Excess Storm water. Floodwater. That water which cannot be contained (or carried) within the banks of a creek or within a storm sewer. 17 .' R n O m 0 2 z O O -t Z n � I r rn • CHAPTER • STORM WATER MANAGEMENT ORDINANCE AN ORDINANCE REGULATING THE RATE OF DISCHARGE OF STORM WATER RUNOFF; SPECIFYING CRITERIA F'OR DETERMINING RUNOFF RATES; ESTABLISHING DEVELOPMENT STANDARDS FOR THE CONSTRUCTION OF RUNOFF CONTROL FACILITIES; SETTING FORTH PROCEDURES FOR THE ADMINISTRATION THEREOF AND PRESCRIBING PENALITIES FOR THE VIOLATION OF THE ORDINANCE. SECTIONS: I. Title 2. Purpose and Intent 3. Authority and Jurisdiction 4. Definitions 5. General Requirem_•nts 6. Dry Bottom Storm Water Storage Areas 7. Wet Bottom Storm Water Storage Areas B. Miscellaneous Storm Water Storage Areas 9. Control in Excess of Requirements 10. Administration and Enforcement 11. Administrative Review 12. Violation and Penalty 13. Separability Clause 14. Repeal of Conflicting Ordinances 15. Effective Date BE IT ORDAINED BY THE CITY COUNCIL OF THE CITY OF IOWA CITY, JOHNSON COUNTY, io:aA: SECTION 1. TITLE 1.1 Title. This ordinance shall be known as and may be cited as the "Storm Water Management Ordinance of Iowa City, Iowa." SECTION 2. PURPOSE. AND INTENT 2.1 Purpose and Intent It is the purpose of this ordinance to establish maximum rates for the discharge of storm waters into Lhe various watercourses of the 15 0 0 City for the purpose of promoting the hea.Lth, safety and general welfare of the population 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 develops -d 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. SECTION 3. AUTHORITY AND JURISDICTION 3.1 huthority. This ordinance and the provisions contained herein are adopted in accordance with the Code of Iowa and under the Home Rule Charter of the City of Iowa City, Iowa, all for the purpose of pro - rioting the health, safety and general welfare of the population and to secure safety from the dangers of flood and economic disaster. 3.2 Jurisdiction. The provisions of this ordinance shall apply to those water- sheds or portions thereof lying within the corporate limits of the City of Iowa City, and to all lands within two (2) miles thereof over which the city exercises extraterritorial subdivision control regulations. SECTION 4. DEFINITIONS 4.1 Storm Water Runoff. Water that results from precipitation which is not absorbed by soil or plant material. 4.2 Natural Drainage. Water which flows by gravity in channels formied.bylthe t ...... surface topography of the earth prior to changes made by the efforts of man. 4.3 Excess Storm Water. (Floodwater). That portion of storm water runoff which exceeds th transportation capacity of storm sewers or natural drainage channels serving a specific watershed.- ----- 16 • COMMENTARY • 3.1 Authority. The basis for establishing this ordinance. 3.2 Jurisdiction. The area covered by this ordinance includes not only the Ralston Creek watershed, but is applicable to the entire city. . That water which cannot be contained (or 4.3 Excess Storm Water. Floodwater ' carried) within the banks of a creek or within a storm sewer. 17 COMENTARY 4.4 itxcess Storm Water Passes e. or othermeans for carrying fA flooaery. A natural or man-made channel, o;v_ arca. (excess storm water) through a speci,i� 4.5 5tozm hater Runoff ttclease Irate. The rate, in cubic feet per second at which storm water is released from one property onto another. ^ rate per acre is the same for Per acre the entire watershed. the release 4.8 Dry Dottom Storm Water StOragle Area. An area designed to store storm water temporarily as contrasted with a Por permanent body of water- A dry bottom storage area may include apar open Parking inti athletic field spaces, temporary detention basins, etc• a segment of, streets, yards, 9•9 Wet Bottom Storm Water Stora e Area. A pond or lake that normally contains water throughout the year but at a reduced level. Available storm would be the additional amount needed to fill the pond to cwater storage apacity. 4.12 Safe Storm Water Drainage Ca acit . The maximum amount of water that can be transported without causing flood damage to adjacent buildings. (This may in- clude the temporary flooding of open space and is not .li.mited to waters carried within a channel. ER 0 4.4 Excess Storm Water Passage. (A floodway_) A channel formed in the ground sur- face to carry excess storm water runoff through a specific area. 4.5 Storm Water Runoff Release Rate. The rite at which storm water runoff is released from dominant to servient land. 4.6 Storm Water Storage Area. An area designated to temporarily accumulate excess storm water. 4.7 Tributary Watershed. The entire catchment area that contributes storm water runoff to a given point. 4.8 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. 4.9 Wet Bottom Storm Water Storage Area. A facility that contains a body of water and which accumulates excess storm water during periods when the restricted storm water runoff release rate is less than the storm water inflow rate 4.10 Control Structure. A facility constructed to regulate the volume of storm water runoff that is conveyed during a specific length of time. 4.11 Positive Gravity Outlet. A term used to describe the drainage of an area in a manner that will ensure complete removal of all surface water by means of natural gravity. 4.12 Safe Storm Water Drainage Capacity. The quantity of storm water 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. 4.13 Low Flow. The transport or flow of a normal or usual volume of storm water as opposed to a high or peak vplume which would utilize overflow facilities. 4.14 City. The City of Iowa City, Johnson County, State of Iowa. SECTION 5. GENERAL REQUIPME-NTS 5.1 Application of Regulations. This ordinance shall apply to any residential 1 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 area shall include streets and other dedicated lands. 5.2 Safety Precautions. All storm water management facilities shall be designed and constructed to fully protect the public health, safety, and welfare. If a condition occurs in a storm water storage area that is determined to present o a hazard to the public health, safety, and welfare, the agency, persn, or persons responsible for the condition will be required to provide approved corrective measures. In the event corrective measures are not employed, the City of Iowa City will cause to have the hazard corrected at the expense of the agency, party, or parties involved. 5.3 Erosion Control. During the construction phase of land development, approved measures shall be taken to prevent the erosion and transportation of soil downstream. Siltation of the downstream areas shall be prevented through the strategic use of stilling basins, sodding of drainage channels, limiting the period of time that the earth is stripped of vegetation or by other methods approved by the City. In the event the storm water storage area functions as a sediment trap, it shall be thoroughly cleaned and restored to its original design storage capacity following the completion of the majority of land- scaping and prior to acceptance by the City where such facility is being dedi- cated to the City. • COMMENTARY • 5.1 Application of Regulations. Applies to any residential development comprising an area of 2 acres or more or to any other development of 1 acre or more. 5.2 Safety Precautions. A statement regarding the correction of hazardous conditions which might occur. 5.3 Erosion Control. Requires temporary erosion control measures to be taken while land is undergoing development. Requires cleaning of desilting basins as necessary (if used). _ 21:. ' ® COMMENTr1RY • 5.4 Storm Water Releese hate. -- ThiN release rate is based on the safe capacity of the downstream system. I 1s I:he same t is expressed in cubic feet per second per acre and throughout the !2alrton Creek watershed. In Computing the release rate for a given structure, the computation shall be based on the storage facility being at 50 percent capacity. The release of storm water shall not exceed 0115 cubic feet drained. In Per 'second. per acre the event a proposed development has additional watershed tribu- tary to it, the total release rate shall be computed as a direct ratio of'the area drained. Since the ordinance covers the -entire city, it is very likely<that release, rates from specific properties particularly in other w6te'rsheds,.can,be ata higher rate than specified herein. Where such can be demonstrated, it would be permitted. 5.5 Excess Storm Water passage. (Floodway). This provision requires all future developments to provide a channel, pipe, ditch, etc., to carry excess storm water through the development. Such passage (which is necessary irregardless of this ordinance) must have sufficient capacity to accommodate the upstream runoff from a'100 -year storm assumingifurther_that all; upstream areas are developed in accord with the City's land use plan. Determi_nation,of the capacity of the excess storm water passage is also based ,on the assumption that all storm sewers upstream from the development are inoperative. In the event storm sewers or intakes become plugged, an adequate passage must be provided to accommodate excess storm waters without causing damage to the affected development. 22_-= A A 5A Storm IJater Release — Rate• The controlled release rate of storm water runoff shall not exceed the existing safe storm water drainage capacity of the downstream System. The release rate shall be the average value com- puted with excess :storm water representing 50; of the available storage 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. Determination of the release rate from each area shall be made in such a manner so that soil erosion in the downstream channel is alleviated. Where a proposed development contains only a portion of a watershed or por- tions of several watersheds, the release rate and storage requirements shall be based upon the proportion of the area being developed as compared to the entire watershed tributary to the proposed storage area. Where it can be demonstrated that a higher storm water release rate will not be contrary to the purpose and intent of this ordinance and where such proposed release rate will not adversly affect properties in the downstream portion Of the watershed, the City Engineer may permit such release rate to be used as he deems appropriate. 5.5 Excess Storm Water Yassa e. M excess storm water passage shall be provided for all storm water storage areas. Such passage shall have adequate capa- city to convey through the proposed development the excess storm water from the tributary watershed. The capacity of such excess storm water passage shall be adequate to transport the peak rate of runoff from a loo year return frequency storm assuming all storm sewers are inoperative, all upstream areas are fully developed in accordance with the City's current 23 JJ 7' 0 0 land use plan, and that antecedent rain2aLl has saturated the tributary ,,;i tershed. uo buildings or structures shall be constructed within such passage, how- ever, streets, parking lots, playgrounds, park areas, pedestrian walkways, utility easements and other open space uses shall be considered compatible uses. Design of the excess storm water passage (or floodway) shall include to eliminate soil erosion or other damage control of stormwater velocity which could detract from the primary us,2 of the area. in the event such passageway is reshaped or its capacity to transport excess storm water otherwise restricted, the City will cause to have any restrictions removed at the expense of the agency, party, or parties causing said restriction. Where a proposed development contains existing natural drainage, approp- riate land planning shall be undertaken to preserve said natural drainage as part of the excess storm water passage. ' 5.6 Determination 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 accord- od of analysis as discussed in "A Computerized ance with the hydrograph meth Method for the Hydrologic Design of .Culverts," I.H.R.B.P. 11-164 published nstitute, Iowa State University, Ames, Iowa. by the Engineering Research I Rossmiller and Dougal, February, 1974 or other method approved by the City. rm water runoff release rate shall be copsidered Engineer. The applicable sto when calculating the required storm water storage capacity. s 24 �. • Co,1,y� z Easements for such passes es shall 0 4 all be granted the city for maintenance or alteration. Possible future _ 5.6 Determination of Stora a Ca acit The storage capacity or calculated on the basis of a volume will be from 100 year storm and will include the m the upstream watershed rateof outflow rate of , control structures as Previous l and the or discharge from Y established. by this ordinance. 25 r CODIMENTARY 5.7 CompensatingStorage.- - Where it is not feasible to store storm water of a specific location, or on a specific site the city, , the owner may, upon approval of Provide compensating storage (storage for a like amount) elsewhere. 5.0 Easements -�_• It should be the general policy of the city to require adequate easements for the necessary maintenance and operation of control structures. 5.9 Design Criteria for storm water control faci into the citlities should be incorporated Y s public works standards. 6.1 DU Bottom Stora a Areas. - _.. ... A• Uses. Such areas should be designed to serve other open s occassional inundation will not ad�ace'e5 which adversely affect: (lilthoygh}s e o states other uses of the storage area would be secondary to thardinance t of stprrm water storage, many other uses, such as recreation areas, parking lots, etc., would in fact become the dominant or principal use). B. Drain Sv^tem. '�--- The drain system is intended to completely drain dry-�ttom storage areas and to transport low or flow drainage resulting from hi , water table, springs, seepage _ other sources that might cause a creek or stream to continue flowing long after storm waters have been removed. 5.7 Compensating Storage. In the event the orderly and r0onable development of an area requires the storage of excess storm water to be located elsewhere, comp- ensating storage (the storage of an equal volume of excess storm water) may be provided at an alternative location, provided however, that the feasibility and do+tails of storm water control shall be approved by the City. 5.8 Easements. Easements which cover excess storm water passages, storm water storage areas and other 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 where it is determined that a storage or control facility primarily benefits only a single property owner or those ilmediately adjacent thereto. 5.9 Design Criteria Standards and Specifications. Standards for the constructio:t and/or development of storm water management structures and facilities shall be in accordance with current city standards for like work or as approved by the City Engineer. The City may request the Iowa Natural Resources Council, the Johnson County Soil Conservation District or other public or private agencies to review appli- cable portions of proposed storm water management facilities or related design criteria. SECTION 6. DRY BOTTOM STORM WATER STORAGE AREAS 6.1 Design Criteria A. Primary and Secondary Uses. Dry bottom storm water storage areas shall be designed to serve a secondary purpose for recreation, open space, parking lot, or similar type of use that will not be adversely affected by occasional intermittent flooding. B. Drain System. A system of drains shall be provided to transport low flow storm water runoff through storage areas. Such drainage systems shall have a positive gravity outlet to a natural passage or storm drain with adequate capacity as described in Suction 5.5. 27 • 0 Multiple 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. C. 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. D. Grades. Where turf areas are used for the bottom of dry bottomstorage areas, the minimum grades for such areas shall be two (2) percent (50 units horizontal to 1 unit vertical). Maximum side slopes for turf shall be twenty-five (25) percent (4 units horizontal to l unit vertical). Storage area side slopes shall follow the natural land contours as closely as practical in order to minimize the amount of earth work necessary to create the storage facility. E. Erosion Control. Suitable 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. Adequate energy dissipating devices or stilling basins shall be pro- vided to ensure that downstream soil erosion is alleviated and the regime of the downstream drainage facility is not disturbed. F. 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 in such a manner to prevent high velocity flow; to provide 28 ® C0P4MENT.1RY • C. Storage Duration. It is proposed that storage areas will be completely drained within 48 hours after a 100 year storm ends. D. Grades. Criteria for grades for turf areas are established to assure adequate drainage of storage areas; to prevent erosion of embankments and to lessen adverse visual impact. F. Control Structures. Controls should be designed to function without occassional adjustment, clogging and without creating turbulent flow wthe structure and cause erosion at which might affect the capacity of the outlet. 29 . • COMMENTARY • G. Overflows. Overflows are necessary to accommodate runoff in excess of a 100 -year storm which would be beyond the capacity of a storage structure. It is anticipated that wet bottom storage areas SECTION 7 WET BOTTOM STORAGE AREAS• (ponds) would most likely be developed by a public agency i.e. SCS_, City, or county park agencies or in conjunction with a farming operation where the water area would serve a primary function i.e. recreation, stock watering, fish rearing. A. Construction. Wet bottom storage areas provide an optional means of con- trolling storm water. If this option is selected, the water area should not exceed one tenth of the watershed area and should be at least four feet deep. Other provisions are included to help ensure a pond which is useable for other purposes and will not become a stagnant mudhole. 30' for the interception of trash and debris and for soil erosion control_ Inlets shall be designed to eliminate turbulent flow conditions during any portion of the storm water storage cycle. Overflow;: for each storm water storage area shall be provided in the event a storm in excess of the des'" capacity occurs. Such overflows shall be constructed to function without specific attention and shall become part of the excess storm water passage. SECTION 7. WET BOTTOM STORM WATER STORAGE AREAS 7.1 Desi�cn 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 6.1-8. The following additional regulations shall apply: A. Construction. The water surface area shall not exceed 1/10 of the tributary watershed. Minimum normal water depth shall be four (4) feet. If fish are to he used to keep the pond clean, at least 1/4 of the pond area shall have a minimum depth of ten (10) feet. Facilities shall be provided to ].ower the pond elevation by gravity flow for cleaning purposes and land/water interface maintenance. pro- tection of the land/water interface shall be provided to alleviate soil erosion due to wave action. II. Control Structures. Control structures for storm water release shall be designed to operate at their maximum rate with only minor increases in the water surface level. This feature is intended to minimize the land surface wetted by frequent minor runoff conditions andtohelp minimize fluctuations in pond level. 31 C. 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. D. Determination of Storage Capacity. When calculating the storage capacit of wet bottom storage areas, only the volume available to store excess storm water shall be considered. Permanent water storage does not con- stitute control of excess storm water runoff. SECTION 8. MISCELLANEOUS STORM WATER STORAGE AREAS 8.1 Paved Surfaces. Paved surfaces, including automobile parking lots in pro- posed storm water storage areas shall have minimum grades of one (1) percent (100 units horizontal to one (1) unit vertical) and shall belimitedto storage depths of one and one-half (1-1/2) feet maximum. Pavement base design and construction shall be accomplished in such a manner as to prevent damage from flooding. Control structures in paved areas shall be easily accessible for maintenance and cleaning. 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 park- ing facility. 8.2 Rooftop Surfaces. Rooftop storage of excess storm water shall be designed with permanent -type control inlets and parapet walls to containexcess storm water. Adequate structural roof design shall be provided to ensure that roof deflection does not occur which could cause roof failure. Over- flow areas shall be provided to ensure that the weight of stored storm water will never exceed the structural capacity of the roof. 32 • COMMENTARY i D. Determination of Storage Capacity. Only that amount of _,pace (volume above the normal or permanent water .level, can be considered as.pro viding storm water storage capacity 8.1 Paved Surfaces. there paved surfaces such as parking lots are used for storm water storage, they should be constructed in such a manner so as to minimize potential damage to the facility as well as other uses. 8-2 xooftoo Surfaces. Rooftop storage is particularlyrapplicable for other than detached single family dwelling units. Large buildings could be modified`- during construction to serve as storage areas. This section alsocontainsia clause intended to relieve the city of .liability in the event of roof failure 33. COMMENTARY 13.3 Underground SLorac;e. Use of underground stdrage_appears .very limited, "but does provide an additional alternative. SECTION 9 CONTROL IN EXCESS OF REQUIREMENTS. Obviously certain areas are well suited and easily adaptable for storm water storage. Where a developer is willing to provide excess storage (i£ it would in fact provide a benefit to the city) the city should participate in its cost. 10..1 Administration. The Building Inspector reviews applications for building permits and is therefore in an excellent position to administer this ordinance. Where runoff determinations are necessary, the proposal can be referred to the appropriate agency for review. Runoff control facilities should (where practical) be constructed during the initial phases of land development in that they may also serve to control erosion when the land is most vulnerable. Where a proposed subdivision is involved, or a planned area -development as provided for in the zoning ordinance, provisions for storm water management could be reviewed simultaneously by the City Planning Commission. Where a proposed subdivision lies outside the City -"limits, butwitbiu the 2�- mile _control area, compliance with this ordinance.,couldrbe made_a-condition of plat approval. 34" 8.3 Underground Storage. tora e • Underground designed for easy access storm water storage facilities shall be to accommodate the removal of accumulated sediment. Such facilities ::hall he provided with positive gravity outlets. SECTION 9. CONTROL IN EXCESS OF REQUIREMENTS 9-1 Provision of Control Exceedinci Requirements. In the event storm water runoff control can be provided in excess of Ulu requirements of this ordinance and the benefit of such additional control would accure to the City of Iowa City at large, the City shall retain the right to provide public participation in the increased cost of the control of storm water runoff in proportion to the additional benefits received. SIiCTZON 10. ADMINISTRATION AND ENFORCEMENT 10.1 Administration This ordinance shall be administered and enforced by the Building Code Official. A building permit shall be obtained prior to the construction of any building, structure or storm water detention facility on the site. No such permit shall be issued until the plans, specifications and cal- culations for the control of storm water runoff as required by this ordinance shall have been approved by the appropriate agency or agencies designated by the City Manager. Facilities for the control of storm water runoff shall, insofar, as practical, be constructed prior to the start of any building construction or site develop- ment- Construction of the storm water control system is intended to be accomplished entirely as part of the cost of land development or redevelopment- Wherethe proposed development involves the subdivision Of land or the development of a Planned Area Development as provided for in the zoning ordinance, the proposed plans shall also be referred to the City Planning Commission for review and recommendation. 35 0 • SECTION 11. ADMINISTRATIVE REVIEW 11.1 Board of Appeals Designated. The Housing Appeals Board for the City of Iowa City, as established by resolution number 1086 of the City Council of the City of Iowa City to hear all appeals involving the Minimum Housing Standards Ordinance and the Uniform Building Code of the City of Iowa City, is hereby designated to hear all appeals involving the Storm Water Management Ordinance. SECTION 12. VIOLATION AND PENALTY 12.1 Violation and Penalities. Any person, firm or corporation who shall violate or fail to comply with the provisions of this ordinance shall be guilty of a misdemeanor and upon conviction shall be fined not more than one hundred dollars ($100.00) or imprisoned for not more than thirty (30) days. Each day such violation continues shall constitute a separate offense. SECTION 13. SEPARABILITY CLAUSE 13.1 Separability Clause. Should any section or provision of this ordinance be declared by the courts to be invalid or unconstitutional, suci} decision shall not effect the validity of the ordinance as a whole, or any, pa rt thereof other than the part so declared to be invalid or unconstitutional. SECTION 14. REPEAL OF CONFLICTING ORDINANCES 14.1 Repeal of Conflicting Ordinances. All ordinances or parts of ordinances in conflict with or inconsistent with the provisions of this ordinance, are hereby repealed to the extent necessary to give this ordinance full. force , and effect. 36 0 COMMENTA RY 0 11.1 Board of Appeals_ Administrative review could be provided by an existing board of appeals which currently hears appeals relating to minimum housing standards and the building code. SEC'CION 15. EFFEC':IVE DATE IS.L Ef Eec five Date. THIS ORDINANCE SHALL BE IN FULL FORCE AND EFF1iCT AFTER ITS PASSAGE AND PUBLICATION AS PROVIDED By LAW PASSED THIS DAY OF 38 SIGNED ATTEST A. D. 14AYOR CLERK VRDINANCE NO. 76-2804 AMENDING %• D AN OI(DINANCI! ZONING ORDINANCE OF Cl2278 BY CHANCING '1'111•; Ii til•: It I•:CIIIA'I'I(RJ:: \� ik'1'A IN PROPERTY PROM Cl t0 C2 7,o,�n, HE IT ORDAINED BY THE CITY COUNCII. OF THE CITY OR IOWA CI'I'y, 104A_ Section 1. The property deacribe.1 below is hereby reclassified frnm its present classification of C1 zone ofC2 zone and the boundaries of the City of Iowa Citas indicated upon the Zoning Map Ing property, to -wit: y, Iowa, shall be enlarged to include the follow - Lots 2, 3 F, 4, Block 1 Fairmeadows Addition -First Unit (Whitehouse Enterprises, along the, cast side of First Avenue between Lower Muscatine Road and Highway 6 Bypass.) Section 2. The building inspector is hereby authorized and direcl.ed to change the Zoning Map of the City of Iowa City, Iowa, to conform to this amendment upon the final passage, approval and publication of this Ordinance as provided by law. Section 3. The City Clerk is hereby authorized and directed to certify a copy of this Ordinance to the County Recorder of Johnson County, Iowa, upon final passage, approval and publication as provided by law. It was moved by deProsse the Ordinance be adopted andion roll call nd nthereed ywere: eves that Balmer AYRS: NAYS: ABSENT: deProsse x Foster x Neuhauser —'t— Perret x Selzer x Vevera x x Passed and approved this 13th day of July , 1976. Ordinance No. 76004 Page 2 -- DiayoLA 4 ATTEST. CITY CLERK{ First Consideration 6/22/76 Vote for passage? Aye: Foster, Neuhauser, Perret, Selzer, Vevera, Balmer deProsse. Nay: None Absent: None Second Consideration Vote for passage:--07`297'7-G-- Aye: Balmer, deProsse, Foster, Neuhauser, Perret, Selzer Nay: none Absent: Vevera Date of Publication • 0 STAFF REPORT Planning and May 6, 1976 0 \\bo Zoning Commission SUBJECT: Z-7606. An application for rezoning a tract of land, Cl to C2. Location of the requested area is along the Lower Muscatine Road and Ili hwa 6 B cast side of First Avenue between by White House Enterprises; Charles Mullen, Attors. ney. Date filed:tion was April 13, 1976; 45 -day limitation: May 28, 1976. STAFF ANALYSIS: White House Enterprises request that a tract of land 59,966 square feet in area be rezoned from Cl to by two arterial streets; Lower Muscatine Road oethe bnorth ject pand eHighway l is r6ered By-pass to the south. Land areas contiguous to boundaries of the request area are zoned C2 (west) and Cl (cast). A substantial tract of land immediately north of the subject area is zoned M1 industrial. Presently the City owns a tract of land contiguous to First Avenue and to the applicant property zoned C2. Whatever the disposition of the City's property, access will be prohibited to First Avenue. The principal reasons needed for the rezoning by the applicant are expressed in their letter of April 1, 1976 to the Department of Community Development (see attachment). The granting of this request, then, would effectively accomplish the following: I. Permit an increase in allowable building heights from 25 feet maximum in Cl to a maximum of 4S feet in C2, 2. Waiving of yard requirements, 3. Change parking requirements from one space for each one hundred (100) square feet to one space for each three hundred (300) square feet, 4. Allow additional uses as permitted by commercial office zone (CO) and highway commercial zone (CH). The Engineering Division has expressed concern to the Planning Division over the increasing traffic congestion at the intersection of First Avenue and Lower Muscatine Road. The change in zoning from Cl to C2 would allow such additional uses as gas stations and other drive-in service establish- ments such as restaurants within close proximity of this intersection. These types of uses would generate high traffic. The Planning and Engineering Staffs agree that this type of development would have an undesirable impact on existing and future traffic conditions. STAFF RECOMMENDATIONS: Based upon the foregoing considerations, the Staff recommends the subject area not be rezoned from Cl to C2. It is ® 0 -z- the Staff's understanding that the applicant does not wish to use the area for construction of a high traffic generating use as suggested above. The staff would, then, recommend that an interim ordinance be adopted to amend the parking requirements for commercial establishments in the Cl Zone. Little Cl zoning presently exists within the City because of the restric- tiveness of its parking requirement. u April 1, 1976 Department of Community Development City of Iowa City Iowa City, Iowa Gentlemen, On behalf of White }louse Enterprises, I hereby request a change in the zoning ordance on the following property from C-1 to C-2: Lots 2-3-4 Block 1 Fairmeadows Addition First Unit. The reasons for the change are as follows: 1—The property is contiguous to land which is C-2, and is directly across Lower Muscatine Rd. which is ITI. 2—There is no other C-1 land on the east side of Iowa City, except for two parcels located x• mile to 1 mile from our property. 3—The nearest residential area (RIA) is located across the Uighway 6 By—Pass, which is a natural barrier from our property. 4—The C-1 classification is presently restricting us from neEotiating on the dale or lease of the property. On the basis of the above explanation, I trust our request will be granted. Respectfully submitted, Ff2iITE � USE ENTERPRISES Arnold L. Davidson/Partner 4 Glendale Terrace Iowa City, Iowa F � L E 0 APR L 31976 ABr31F STOLFUS CITAY CLERK IlLl VI i J R♦ �'1i� I I 1 C ill , . 1 i, Rn.-� 1. - - -1r L� 1 .� i ' ` \� `, TTY ITA TiTj F J1 111111 'T l t4" I •�91N i, IJ C 2. RIA C t REQUEST AREA "tom ��p 12001200 1 O NORTH GRAPHIC SCALE :1"=660' r, FILE N MBER. Z-7606 MI 0 r -I L ADVERTISEMENT FOR BIDS For the construction Program and woof the FY 77 Slabjacking and For the Cir irk Of to construction in ty of Iowa City, Iowa Sealed proposals will be received by the City Clerk of the City of Iowa City, Iowa, until 10:00 A.M. on the 8 day of .July 1976 , and opened immediately thereafter by the City Engineer. Proposals will be acted upon by the City Council at a meeting to be held in the Council Chambers at 7:30 P.M. such later time on July 13, 1976 and or at Place as may then be fixed. The Proposed Slabjacking improvements will consist of the rehabilitation, leveling, filling of voids beneath and resealing of cracks and joints of certain concrete pavements together with necessary incidental facilities related thereto on streets and property located within the limits of the City of Iowa City, Iowa. The kinds of materials and estimated quantities of materials proposed to be used in conjunction with said slabjacking improve- ments are as follows: ES TI,IATED DANT [ TY 1. 350 2. 2,075 3. 60 4. 830 5. 30,000 UNIT DESCRIPTION flours Furnish the slab`ack:in assumption of all workgduties, on a total equipmen Supply' labor and materials arrangements and handling 9`1 lb/sack Portland Cement 100 lb/sack (Vater Impervious Addition (Bentonite) Tons Pumping in b Soil Lin. ft. Cleaning and sealing cracks and joints A-1 0 All work is to be done specifications prepared by of Iowa City, Iowa, which ha Council, and are on file for City Clerk. n L in strict compliance with the plans and Eueene A. Dietz` P.E. , _Citv__Eno;__ Fff ve ere o ore een approve y �iie City public examination in the Office of th Wherever reference is made to the specification in the plans or contract proposal, it shall be understood to include the "Standard Specifications for Construction on Primary, Farm to Market, and Secondary Roads and Maintenance Work on the Primary Road System", Series of 1972, Iowa State Highway Commission. Each proposal shall be made on a form furnished by the City and must be accompanied by a cashiers or certified check, drawn on Iowa Bank and filed in a sealed envelope serrate from the one con- taining the proposal, and in the amount of serrate 000.00 made payable to the City Treasurer of the City of Iowa City: fovea, and may be cashed by the Treasurer of the City of Iowa City, Iowa, as liquidated damages in the event the successful bidder fails to enter into a contract within ten (10) days and post bond satisfactory to the City insuring the faithful performance of the contract. Checks of the lowest two or more bidders may be retained for a period of not to exceed fifteen (15) days until a contract is awarded or rejection made. Other checks will be returned after the canvass and tabulation of bids is completed and reported to the City Council. Payment to the Contractor will be made in cash from such funds of the City that may be legally used for such purposes on the basis of monthly estimates in amounts equal to ninety percent (90%) of the work accomplished as outlined in "Method.of Payment". By virtue of statutory authority; preference will be given to products and provisions grown and coal produced within the State of Iowa, and preference will be given to Iowa domestic labor in the construction of the improvement. The successful bidder will be required to furnish a bond in an amount equal to one hundred percent (100%) of the contract price, said bond to be issued by a responsible surety approved by the City Council and shall guarantee the prompt payment of all materials and labor and protect and save harmless the City from claims and damages of any kind caused by the operation of the contract, and shall also guarantee the maintenance of the improvement for a period of 0 years from and atter its completion and acceptance by the City. The nark under the proposed contract will be commenced within ten (10 ) days after signing of the contract and shall be completed September 15, 1976 Time is an essential element of the contract. Liquidated damages in the amount of Fifty Dollars ( $50.00 ' ) will be assessed in accordance with "Base Specifications" Article 1108.08 for each calendar day required for project completion after the above designated date. A-2 N -6A 0 • The plans and specifications governing the construction of the proposed improvements have been prepared by Eu ene A. Die z City F._gineer of Iowa City, owa, w is p ans an specs ica<zons, also prior proceedings of the City Council referring to and defining said proposed improvements are hereby made a part of this notice by reference and the proposed contract shall be executed in compliance therewith. The plans, specifications and proposed contract documents may be examined at the Office of the City Clerk. Copies of the said plans and specifications and form of proposal blanks may be secured at the Office of Eugene A. Dietz P.E. , City Engineer of Iowa City, Iowa,y ona i e i ers upon payment of fifteen dollars ( $15.00) which will be return—Ua Te tot e bidders prove e t e plans and specifications are returned to the City Engineer's office in good condition within fifteen (1S) days after the opening of bids. The City reserves the right to reject any or all proposals and to waive technicalities and irregularities. Published upon order of the City Council of Iowa City, Iowa. a,,-•� - L w bl a 6LO11US City Clerk of Iowa City, Iowa A-3 ,J_6B