HomeMy WebLinkAbout1975-05-06 Resolution- RESOLUTION NO. 75-116
It was
moved by Neuhauser and aeconded
byDavidsen
that the
Resolution as read be -adopted, and upon roll call
there weret
AYES: NAYS:
ABSENT:
x
Brandt
x
Czarnecki .
x
Davidsen
x deProsse
- -
x
Neuhauser
Passed
and approved this 6th day of
May 19
75
- Mayor
ATTEST:
CSty Clerk
1
'
Department of Public Works
'
To: Developers, Contractors Engineers, Architects
'
working in Iowa City
here for your easy reference; is a brochure forth
-setting
the design standards for Public Works improvements
,as,they
apply here in Iowa City. We feel that attention to these
standards will result in less confusion -and -uncertainty on
your part while planning, designing and constructing, these
facilities, well
as as reducing -the operating and maintenance
problems which the City of Iowa City encounters once the
facility is built and in use.
-
This booklet contains standards for streets and alleys,
'
sidewalks, water distribution systems, sanitary and storm
sewers, traffic signals and 'street -lighting. It should be
pointed out that these standards are by no means all
'
inclusive, For more detailed information -please contact the
Engineering Division of the Department of Public Works -
which is responsible for the implementation of these design
'
criteria.
Thank you for your cooperation. We hope you enjoy working
'
in Iowa City.
Respectfully yours,
'
George R. Bonnett, P.E.
City Engineer
'
RES:db
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TABLE OF CONTENTS
STREETS
--------------------------------------
I -1--I-5
ALLEYS---------------------------------------
----------- --------------------------III.
III.
SIDEWALKS ------------------------------------
III -1
'
IV.
DRIVEWAYS ---------------=--------------------
IV -1
V.
WATER_ DISTRIBUTION -SYSTEMS -------------------
V -1--V-2
-VI.
SANITARY
SEWERS ------------------------------
VI-1--VI-4
VII.
STORM SEWERS ---------------------------------
VII-I--VII-3
VIII.
TRAFFIC CONTROL ------------------------------
VIII -1-- VIII -II
'
IX.
ROADWAY LIGHTING -----------------------------
IX -1-- IX -2
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Figure1
- Typical Street Cross -Section
Figure
'2 - 'Typical 30" Curb & Gutter
Figure
3 - Typical Curb Cross -Section
'
Figure
4 - Typical Alley Cross -Section
Figure
5 - Driveway Diagram
Figure
6 - Typical -Manhole 6' or less in Depth
Figure
7 - TypicalManhole 6' or more in Depth
-
'
Figure
8 - Sanitary Drop Connection
-
'
Figure
9 - Sanitary. Riser
Figure
10 - Pipe Bedding
-_
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Figure
11 - Alley Catch Basin
Figure
12 - RA -3 Curb Intake
'
Figure
13 - RA -4 Curb Intake
'
Figure
14 - RA -5 Curb Intake
Figure
15 --RA-6 Curb -Intake
tFigure
16 - RA-7-Throat-Extension-
A-7 Throat ExtensionFigure
Figure17 - RA -8 Curb `Intake
'
Figure 18 - Typical Traffic Signal Location
-_
Figure -19 — CuZ-de Sac Street
'.-
Eigure 20 - 'Typical Drop Curb`- for 'Sidewalks '
1
i15.2
Design criteria for arterial streets shall be in accordance with
`
'the -Highway Capacity Manual published in 1965 by the Highway
1
Research Board and shall be equivalent to "Level of Service = C".
'
I-16.0 Side
Clearance
16.1
No obstructions of any type, including traffic control devices,
shall be placed closer than 2 feet to the back edge of the curb.
1
-
1-17.0 Open
Ditches
_ 1
17.1
Where a curb and gutter section isnot required and open ditches
are provided -for drainage,the minimum; ditch grade shall be 1.0%
1
and the maximum grade shall be 3.0%. In addition, it will be
necessary to place a concrete pipe through all drive -approaches
constructed through the drainage ditch. The size pipe required
will ;be a functionofthe area to -be drained. -
i17.2
The cross slope shall he a desirable A to l slope with a maximum_
permitted slope of 2 to 1
1
_
- 1-18.O Acceleration - Deceleration Lanes -
1
1R.1
As a general rule, speed change lanes such as acceleration and
deceleration lanes will not be added -to.pavements except where
industrial streets intersect with major arterial streets and
1
heavy truck- traffic -warrants the construction of such lanes.
1
1-19.0 Subgrade Requirements
19.1
The-subgrade shall be scarified to a depth of 6cinches below the
pavement, and compacted to 90% of Modified Proctor Density for
1
Portland Cement concrete pavement and to 95% of Modified Proctor
Density for Asphaltic Cement concrete pavement.
1
19.2
The subgrade in fill ahaZZ be 90% of Modified Proctor Density
except for the top 6 inches which shall meet the requirements for
the appropriate surface material.
1
1
1
T_5
1
'
6.2
The required pavement thickness in
inches is as outlined below:
Portland Cement full Depth -
Deleted Reference to Rolled
'
Concrete Asph. Concrete
Stone Base Alternative
71'
6.3
There will be no curb and Futter sections
built as part of alleys.
11-7.0 Subgrade
Requirements
7.1
The subgrade shale be scarified to
a depth of 6 inches bew.the
pavement and com acted to ,90"A of
Modified Proctor Density for
'
Portland Cement concrete pavement
and to 95% of Modified Proctor
Density_ for Asphaltic Cement concrete pavement.
7.2
The subgrade in fill shall be 90%
of Modified Proctor Density
-
except for the top 6.inches'which
shaZZ.meet the requirements for
the, appropriate surface material.
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1
--
1
a
11-2
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III
SECTTON
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SIDEWALKS
III -1.0 Width
1.1
Sidewalks shall be a`minimum of 4 feet in width except in the
Central Business District or in other areas specifically
approved by the City where the width may be greater.
1.2
Sidewalks -shall -be located l foot from the property linea
-111-2.0=Cross'Slope
2.1
All sidewalks shall slope to the street at ,a rate of 1/4 "inch
-
per foot
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2.2
Sidewalks shall be required on both sides of all streets except
industrial streets.
2.3
The street edge of the sidewalk surface shall be located above
'
the curb 1/3 inch for every foot horizontally from the curb.
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111-3.0 Material and Thickness
3.1
Sidewalks shall he constnicted of four inch thick non -reinforced
'
Portland Cement concrete conforming to the "Towa State Highway
_
Commission C-3 mix.
3.2
Sidewalks crossing driveways shall be constructed of 6 inch
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non -reinforced Portland Cement concrete conforming to the`Iowa
'State Highway Commission C-3 mix.
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III -4.0 Curb Ramps
4.1
All sidewalks shall provide_a curb ramp for accommodation of the
'
handicapped at all intersections.
4.2
Curb 'ramps shall be located in line with the public sidewalk as
'
shown in Figure 20.
4.3-
Curb 'ramps shall be at least 48 inches wide and should be sloped
'
at not greater than one inch of rise per twelve inches lineal
distance. A slope no greater thanoneinch of rise per eight
inches lineal distance may be used where necessary.
'
4.4
Ramps shall be sloped from the sidewalk intersection to the curb
as shown in Figure 20. - -
SECTION IV
'
DRIVEWAYS
'
TV -1.0 Driveway Material and Thickness
1.1
The -driveway slab extending from the street to private property
'
shall be constructed of non -reinforced Portland Cement concrete
conforming to the Iowa State Highway Commission
C-3 or M-3 mix 6
inchesinthickness.
1.2
All driveways shall have one inch preformed expansion at front
and back of sidewalk. ---
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IV -2.0 Driveway Width
2.1
Maximum curb opening along any street shall be 42 feet.
'
2.2
Except as noted in 2.3 below, the maximum driveway width shall
not exceed 24 feet as measured along the street side of the
sidewalk line.
2.3
marked -as
On streets permanent state or federal highway roads,
a driveway may he constructed -with `a maximum width of 36 feet
as measured along the street side of the sidewalk line. :-
'
IV -3.0 Driveway Location
3.1
No portion of a driveway except the curb return shall be
constructed within 20 feet of -a corner and in no case closer than
'
3 feet to the property line as extended. See Figure 5 for
typical driveway locations.'
'
3.2
Where more than one driveway approach on a street front serves
a single parcel of land, ,there _shall be at least 20 feet of
space between driveways.
1
_-_ _
IV -1
SECTION VI
SANITARY SEWERS;
_l,p-T a of Flows Permitted
VI _ ro'ected land use
J
All sewage flows shall be based on the future p
1.1 -
under consideration.
for the area
shall be kept separate. No
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1.2 Sanitary sewers and storm sewers
be constructed.
combined sewers shall
except se wage.
shall be per in the sanitary, sewers
1.3 Nothing drains, do wnspouts, sump pimrps, etc. will
This means that footing
discharge into the sewer system. Air conditioning
not be allowed to
allowed in the Sanitary sewer.
condensation water_is
VI 2 0Dow
give a mean velocity,
'
e that will
A11'sewers shall have a slop per second based
less than 2.0 feet
-2.1
when flowing `full, -of ,not
„N„ value of 0.013.
'
an
on Kutters formula using flowing
2.2 Sewage flows will be based.on_peak rates with the pipe
2.5 times the normal.
100'<
full which will be`taken`as approximately
be for by the addition of
'
flow. Infiltration will, allowed
gallons per capita per day.
for various usage are
2.3 The peak wet weather flows as follows:
a) Dwellings
'
I) Single FamilyK factor 100 gal/cap day -
day) x 2.5(pea
350 gpcpd
(100-gal/cap
(infiltration)
'
day
2) Mobile Homes (peak factor)+ l00 gal/cap
2.5 (P
225 gpePd
(50 gal/cap day) x
(infiltration)
3) Milti Family x 2.5(peak factor)+ 100 gal/cap day
"gal/cap day)
287 gpePd
(75
'
(infiltration)
2 5(peak factor)+ 100 gal/cap _day
4) Motels and Hotels
- 225 gpcpd
(50 gal/cap day) x
(infiltration)
'
b) Schools
1) Without cafeteria or showers al ca day
2.5 (peak factor)+ 100 g / P
=,125 gPePd
(t gal/cap day) x
10
'
(infiltration)
'
, VI -1
;
1
'
2) With cafeteria and showers
(20 gal/cap day) x 2.5(peak`factor)+ 100 gal/cap-day
(infiltration) 150
gpcpd
C) Office Buildings
(10 gal/cap day) x`2.5(peak factor)+ 100 gal/cap day
-
(infiltration) 125
gpcpd
d) Light Industrial
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(14,000 gal/acre day) x 2.5(peak factor)+ 1200 gal/acre day
(infiltration) = 36,200-gpapd.
'
gpcpd
= gallons per capita per day
gpapd
= gallons per acre per day
2.4
Where velocities greater than 15 feet per second are attained special
provision shall be'made-to-protect against displacement,_ erosion
-
or shock.
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2.5
When a smaller sewer joins a larger one, the invert of the larger
_
sewer shall be -lowered sufficiently to maintain the same energy
gradient.- An-approximate methodforsecuring these -results -is to
'
place the 0.8 depth point of both sewers at the same elevation..
V1-3.0 Pipe
Standards
3.1
Extra strength vitrified clay pipe shall be used for sanitary sewers
'
15 inches in diameter or less. Reinforcedconcrete pipe shall be
used for sewers larger than 15 inches. Special conditions may
require the use of reinforced-concrete-pipe for diameters__smaller
-
than 15 inches or the use of cast iron pipe. Pipe will be of
sufficient strength to support the superimposed loads.
3.2
All sanitary sewers shall be a minimum of 8 inches in diameter._
'
3.3
In general, sanitary sewers shall be sufficiently deep so as to
receive sewage by gravity from basements as well as to prevent
'
freezing.
3.4
Sanitary sewer joints shall be designed to minimize infiltration
and to prevent the entrance of roots. Allowable infiltration
'shall
notexceed 500gallons per inch diameter per_mileq-per day.-
3.5.
A-4--inch diameter' service wye of a material equal in quality to "
the main sewer shall be installed-wherever_-a residential service
'
connectionis anticipated._ House services connected with tees
are not acceptable.
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VI-4.0 Manhole Standards
'
4.1
Manholes shall be'installed as follows:
a) at the end of each line;
1
-
V1-2
V1=3
1
b) at ,all changes in grade, size, or alignment;
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c) at all intersections; and
d) at distances not greater than 400 feet for sewers.15 inches
or less in diameter and 600 feet for sewers 18 inches to
'
30 inches. Greater spncing may be `permitted in larger
sewers and in those carrying a settled effluent.
'
4.2
A drop pipe shall be provided for a sewer, entering a manhole at
an elevation of 24 inches or more above the manhole invert. Where
the difference in elevation_ between the incoming sewer and the
manhole invert isless than 24 inches the invert shall be -filleted
'
to prevent solids deposition.
4.3
The minimum diameter of manholes shall be 48 inches. The minimum
'
diameter of the opening at the top of the manhole -shall be 23
inches. - -
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4;4
The flow channel through sanitary sewer manholes shall be made
the sewers.
to conform in shape and slope to that of
4.5
Standard manholes, drop connection and riser are shown in Figures
6, 7, 8 and 9.
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V1-5.0`Frotection of Water Supplies
5.1
There shall be no physical connection between a public or private
'
potable water supply system and a sewer appurtenance which would
into
permit_the,passagc of any..sewage or -polluted -water the potable
supply.
'
5.2
Whenever possible, sewers should be laid at least10feet,
horizontally, from 'any existing or, proposed water_ main. Should
local conditions prevent a lateral separation of 10 feet,' a sewer
'
may be laid closer- -than 10 feet to a water main if:
a) it is laid in a separate trench;
'
-
b) it is _laid in the same trench with the water mains located
- at one side on a bench of undisturbed earth; or
'
e) in either case the elevation of the crown of the 'sewer is
at ]cast _18 inches below -the invert' -of the water main.
'
5.3 5.3
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.
'
54
When the elevation of the sewer cannot beburied 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 10 feet on each side of the
sewer. One ful11ength of__water main should be::centered.over the
E
sewer so that both joints will be as far from the sewer as Ipossible.
V1=3
VI -6 0 Proper Backfilling
- - -
6.1= Where the sewer crosses an existing or proposed sidewalk or street,
material
the sewer trench
shall he backfilled with n suitable
compacted to 90%
modified proctor Density.
6.2 Normally the pipe shall be Class "C" bedded with hand tamping
sub conditions
'
around the lower
half of the pipe.If severe -grade
direct Type "B'-' bedding to be
are encountered
the Engineer shall
"B" bedding is as shown in Figure 10:
used. Class "C"
and Class
1
-
1
1
1
VT
-4
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SECTION VII -
STORM SEWERS
'
VII -1.0 Design Flows
1.1
Storm water flows shall he basedonthe "Rational Formula",
Q - CIA where C is the coefficient of runoff, I is the rain
'
intensity in inches per hour, and A is the area in acres.
1.2
Depending upon the area through ,which the storm sewer will be
constructed the sewer will he designed for 5 year storm. In
high risk areas the storm sewer may be designed for a 10 year
storm.
'
1.3
All _s ewers shall have a slope that will give a mean velocity,
when flowing full, of not less than 2.0 feet per second based
on Kutters formula using an "N" value of 0.013.
1.4
Wherevelocities greater than 15 feet per second are attained
special provision shall be made to protect' against displacement,`"
'
erosion or shock.
Vii -2.0 Inlet and Pipe Design Standards
2.1
Inlets and pipes shall be located and sized so that the following
conditions are met:
'
a) For a 5 year storm'.
1) Streets, except for arterials,; shall have one 12 -
'
foot traffic lane free of storm water flowing or
ponded in the gutter. 'Arterial 'streets 'shall have
two traffic lanes free of -storm -water.
2. Approiimately 80% of a1Z storm_ water, from a street
above an intersection shall be intercepted.
'
3) Accesses to the buildings along pedestrian malls shall
be free of storm water.
'4)
Storm water from a pedestrian mall shall not flow
across the sidewalks at either end of the mall.
'
b) The final designshall be checked to ensure that in a 50_
year -storm -the depth of water in any _street,_alley, or
pedestrian mall will not exceed the level at which it
'
would flow over the curb or edge of slab of that street,
alley or pedestrian mall. ;
2.2-
Curb type inlets shall be used in streets. Grate type inlets shall
'
be used in alleys and pedestrian malls. The types of inlets to '
be used are shown in Figures 11, 12, 13, 14, 15, 16 and 17.
VII -1
'
Vit -3.0 Pipe
Standards
3.1
Storm sewer pipe will he reinforced concrete pipe unless special
conditions require the use of iron
cast pipe. The pipe will be
a minimum of 2,000 D strength to supportsuperimposed' loads.
'
3.2
All storm sewer pipe shall be a minimum of 12 inches in diameter.
V11-4.0 Manhole' Standards
4.1 ,
Manholes shall be installed as follows:
'
a) at the end of each line;
b) at all changes in grade, size or alignment except for
sewers 30 inches or greater in diameter which may he
laid with changes in alignment without manholes;'
'
c) at all intersections; and -
d) at distances not greater than 400 feet for sewers 15
inches or less in.diameter-and 600 feet for sewers 18
'
inches to 30 inches. Greater spacing may be permitted
in larger sewers and in _those carrying a settled effluent.
'
4.2
The minimum diameter of manholes shall be 48 inches. The minimum
diameter of the opening at the top of the -.manhole shall be 23
inches.
'
4.3
The flow channel through storm sewer manholes shall be made to
conform in shape and slope to that of the sewers. -
'
4.4
Standard manholes are shown in Figures 6 and 7.
'
4.5,
When_a smaller sewer joins a larger size pipe, -the -invert of the
larger sewer should be lowered sufficiently to maintain the same
energy gradient. An approximate method -for securing this result`
is to place the 0.8 depth point of:both-sewers at -the same ele-
vation.
VII -5.0 Protection of Water Supplies
5.1
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 water
polluted
into the.potable supply.
'
5.2
Whenever possible, sewers:should be laid at least 10 feet, horizontally;-:
from any existing orproposedwater main. Should local conditions
prevent a lateral separation of 10 feet, a sewer may be laid closer
'
than 10 feettoa water main If:
a) It is laid in a separate trench; -
'
V11-2
-'
b) it is laid in the same trench with the .water mains located
--
at one side on a bench of undisturbed earth; or
'
c) in either case the elevation of the crown of the sewer is
at least 18 inches below `the `invert of the water main.
5.3
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.
5.4
he
When the elevation of the sewer cannot be buried to meet the-
above-requirements, the water main shall be relocated to provide
above requirements,
this separation or reconstructed with slip-on or mechanical-joint
'
-
cast iron pipe, for a distance of 10 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.
'
VII-6.0 Proper Backfilling
6.1
Where the sewer ,crosses _an existing or propos edsidewalk or
street, the sewer trench shall be backfilled with;a suitable
'
material compacted to 90% of Modified Proctor Density.
'
6.2
Normally the pipe shall be, Class "C" bedded with hand tamping
around the lower half of the pipe.` If severe sub--grade-conditions
are encountered the Engineer shall direct Class -"B" bedding to be
used. Class 'B" and Class "C" bedding are as shown in Pigure 10.
'
6.3
If granular material is used for, backfilling all storm sewer
joints shall be sealed with asphaltic material.
VII-7.0 Requirements
for -Storm
-Sewer
7.1
Allstormdrainage will normally be carried in an enclosed storm
sewer. Open channel flow is permitted only under special circum-
stances and with specific approvalofthe City Engineer.
VII-3
SECTION VIII
'
TRAFFIC CONTROL SIGNALS
'
V11I-1.0 Number ofLenses er Si nal Face -
1.1 Each signal face except in
pedestrian signals
least three lenses, shall have at
be but more
red than five. The lenses shall
yellow of green in color, and shall
arrow type
give a circular or
of indication. Allowable
exceptions to the above -are:
Where
a single section green arrow lens
indicate a continuous is used aloneto
movement.
1.1.2 Where one more indica tions are repeated
safety
im
im
orpact , for reasons of
'
VIII -2.0 Size and Desi n of Si nal Lenses
2.1 The aspect of allsignal -
shall be lenses, except in
'
circular. Thepedestrian signals,
There shall be two sizes
inches and
for lenses,
12 inches nominal diam eter. $ _
2.2 Twelve -inch lenses normally should be
used:
2.2.1 For intersections with 85
percentile
40 mph. approach speeds exceeding
2.2.2 For -intersections where
signalization might be unexpected.
2.2.3 For
'
special problem locations, such as those with conflicting
or competing background lighting. t
2.2.4 For intersections where drivers may view
trol
both traffic con-
and lane -direction -control
signs simultaneously.
2.2.5 For all
arrow indications.
-
Arrows shall be pointed verticallyupward to
through movement
indicate a Straight -
and in a izontadirection
!Urn turn at approximately, l
'
right an to indicate a
is substantiallyrent angles. When the
angle of the turn
Om be positioned on the
upward
tang
'
an -arrow should--.
slope an
In -angle-
to that of the turn, approximately equal
Each arrow lens shall show only one arrow direction. The arrow
shall be the only illuminated -part -of the lens
visible.
In no case shall letters or numbers be die
vehicular signal -indication.
Played as
1
- partofa
;
VIII-1-
'
3.1:5-
Except where the width of the intersecting street or -
other conditions make -it,physically impractical, at
least one and preferably both of the signal faces re-
e-
'
quired-by paragraph 3.1.1 above
quired by_;paragraph=3.1.1`above shall be located between`
two lines intersecting with the center of the approach
lanes at the stop line, one making`. an angle of approximately
20 degrees to the right of the center of the approach
'
extended, and the other making an angle of approximately;
_
20 degrees to the left of the center of the.approach
'
extended.
3.1.6
Near-side signals should be located as near as practicable
to the stop-line.
'
3.1.7-
Where a signal face controls a specific lane or lanes of
approach, its transverse position; should be unmistakably
'
in line with the path of that movement.
--
- -3.1.8 -
Required signal faces for any one approach shall be not
'
less than eight feet apart measured horizontally between
centers of faces.
3.1.9
When the nearest signal face is more than 120 feet beyond
'
the stop line, a supplemental near side signal indication
shall he provided.
3.1.10
A signal face mounted on a: span wire or mast arm should
t
be-located as near as practicable to the line of the driver's
normal view. ,
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3.1.11
Supplementalsignalfaces should be used when an engineering
study has shown that they are needed to-achieve both advance
and immediate intersection visibility. When used,-they
'
should be located to, provide_ optimum visibility for-the-
or themovement
movementto be controlled.. The following limitations
apply:
'
a. Left turn-arrows shall not be used in near-right faces.
b. Right turn arrows shall not be used in far-left faces.`
'
A far-side median mount signal-shall be: considered as
a far-left signal for this- application.
At signalized mid-block crosswalks, there should be at
t
least one signal face over the traveled roadway for-each
approach. In other respects, a traffic control signal at '
'
a mid-block location 'shall meet the requirements set forth''
herein.
'
VIII-3
VIII -4.0
Height of Signal Faces
- '
4.1
The bottom of the housing of a signal -face I not mounted over a
roadway, shall not be less than 8 feet nor more than 15 feet
above the sidewalk or, if none, above the -pavement'' grade at the
center of the highway as shown in Figure 18.
'
The bottom of the housing of a signal face suspended over a
roadway shall not be less than 15=feet nor=more than 19 feet
'
above the pavement grade at the center of the roadway as shown
in Figure 18.
Within the above limits, optimum visibility and adequate clearance
should be the guiding considerations in deciding signal height.
'
Grades on approaching streets may be important factors, and should
be considered in determining the most appropriate height.
'
VIII -5.0 Transverse Location of -Traffic Signal Supports and Controller Cabinets-
'
5.1
In the;,plavement of _signal supports, primary consideration, shall
- be given to ensuring the proper visibility of signal faces as
described in sections 'VIII -3.0 and VITT-4.0. However, in the
interest of safety'Signal supports and controller cabinets should
'
be placed as far as practicable from'the edge of the traveled way
without adversely affecting signalvisibility.
'
5.2
Supports for post -mounted signal heads at the side of a street
with curbsshallhave a horizontal clearance of not less than 4
feet from the face of a vertical curb. Where there is no curb,
'
supports for post -mounted signal heads shall have a horizontal
clearance of not less; than two feet from the edge; of a shoulder,
within the limits of normal vertical clearance.. A signal support
'
should not obstruct a crosswalk.
VIII -6.0 Warrants =for -Traffic Signals
'
6.1
A comprehensive investigation of traffic conditions and physical
characteristics of the location is required to determine the
'
necessity for -,a signal installation and to,furnish necessary data
for the proper design and operation of a signal that is found to
-_
==be=warranted, Such data desirably 'should 'include:
'
6.1.1 The number of vehicles entering the intersection in each
-hour from each approach during 16 'consecutive hours of a
representative day. The 16 hours selected should contain
'
the greatest percentage of the 24-hour traffic.
6.1.2 Vehicular volumes for. -=each traffic movement -from `=each =
'
approach, classified by vehicle type (heavy; trucks,
,passenger cars and light trucks, and public -transit ve-
-
hicleg), during eac;h_15-minute period of the tiro hnurs
.
In the`morninp, and oi' the two hours in the afternoon
'
during which=total traffic entering the intersection is
greatest.
VIII -4
1
• •
6.1.3 Pedestrian volume counts on each crosswalk during the
same. periods as the vehicular counts inparagraph6.1.2
above.and also during hours of highest pedestrian volume.
Where young or elderly persons need specialconsideration,
'
the pedestrians may be classified by general observation
-
and recorded by age groups as follows:
'
a. under 13 years
b. 13 to 60 years -
",
c. over 60 years
6.1.4 The 85 -percentile speed of all vehicles on the uncontrolled
approaches to the location.-"
6.1.5 A-conditions'diagram-showing details of the physical lay-
out including such features 'as_ intersectional _geometrics,
channelization, grades, -sight -distance restrictions, bus
'
- stops and routings, parking conditions, pavement markings,
street lighting, driveways, location of, nearby railroad
crossings,' distance to nearest signals, utility poles and
'
fixtures, and adjacent land use.
6.1.6 A collision diagram showing accident experience by type, '
'
location, direction of movement, severity, time of day,
date, and day of week for at least one year.
6.1.7 The following data are also, desirable for -a more precise ;
'
understanding of the operation of; the intersection and may
- be obtained during the periods specified in 6.1.2 above:
'
a. Vehicle -seconds delay determined separately for
each approach. -
'
b. The number and distribution of gaps in vehicular
traffic on the major street when minor -street
- traffic finds it possible to use the intersection'
'
safely.
c. The 85 -percentile speed of vehicles on controlled
approaches at a point near to the intersection but
t
unaffected by the control.
d. Pedestriandelay time for at least two 30 -minute
eek-
peak pedestrian delay periods of an average week-
day`or like periods of a Saturday or a`Sunday.
day or
•
6.2 An investigation of the needfortraffic signal control should in-
'
clude where applicable, at least an analysis of the factors con-,
tained in the following warrants:
Warrant 1 - Minimum vehicular volume.
'
Warrant 2`- Interruption of continuous traffic:
Warrant '3' ---Minimum pedoatrian volume.
-
Warrant 4 - School crossings.
t
Warrant 5 - Progressive movement.
Warrant_6_-_ Accident experience.
'
Warrant 7 -,Systems.
Warrant 8 - Combination of warrants.
VIII -5
6.2.1 Warrant 1, Minimum Vehicular Volume
The Minimum Vehicular Volume warrant is intended for
'
application where the volume of intersecting traffic
Is the principal reason for consideration of signal
installation. The warrant is satisfied when, for each
of any.8 hours of an average day; --the-traffic volumes
'
given in the table below exist on the major street and
on he higher -volume minor -street approach to the inter-
'
section.
MINIMUM VEHICULAR
VOLUMES POR WARRANT 1
=
'
- Vehicles per hour
Vehicles per hour on higher -volume
Number of lanes for
moving on major street minor -street ap-
traffic on each approach (total both
of ap- proach.(one di-
'
Major Street Minor Street proaches) rection only),
1 ----------- 1 --- -- Soo ISO
2 or more 1 ---------- 600
'
2 ISO
or more --- 2 or more -- 600 - 200
1 --------r-- 2 ,or more -- Soo 200
These major -street and minor -street volumes are for the same
8 hours.-
During those 8, hours, the direction of higher,
'
volume on the minor street :may -be on one approach during
some hours and on the opposite approach during other hours.
When the 85 -percentile speed of major -street traffic exceeds
40 miles per hour, or when the intersection lies ,within
the built-up area isolated
of an community having,a population
of less than 10,000, ,the minimum vehicular volume warrant is
70
-'
percent of the requirements above (in recognition of
differences in the
nature: and operational characteristics
of --traffic in urban and rural environments -and -smaller
municipalities).
6.2.2 Warrant 2, Interruption of Continuous Traffic
The Interruption of Continuous Traffic warrant applies
to operating:conditions where the traffic volume on a
major 'street ,is so__heavy_that traffic on a minor intersecting
suffers excessive delay or hazard in entering or crossing
the
major street. The warrant is satisfied when, for each
'
of any 8 hours of an average day, the traffic volumes given
in
the table below exist on the major street and on the
higher -street
'
-volume minor approach tothe intersection,
and the signal installation
will not seriously disrupt
progressive traffic flow. -
1
t
''
VIII -6
'
A signal installed -under this warrant at an isolated
intersection should be of_`the-traffic-actuated type
'street.
with push buttons for pedestrians` crossing the main
if,such a -signal is installed at,an intersection
within a signal system, it should be ,equipped and operated
with control devices which provide proper coordination.
--
Signals installed according to this warrant shall be
equipped with pedestrian indications conforming to re-
'7
quirements set forth in other sections of this Manual.
Signals may be installed at
nonintersection locations
(mid -block) -provided the requirements of this warrant
'
are met, and provided that the related crosswalk is not
closer than. 150' -to -another established crosswalk.
Curb-
side parking should be prohibited for.1001cin advance
of and 20' beyond the crosswalk. Phasing, coordination,
-and installation must conform to standards set forth
in this Manual. Special attention should be given to
the signal -head placement and the signs and markings
used at nonintersection locations to be sure drivers
'
are aware of this special application.
'
6.2.4 Warrant 4, School Crossing
A traffic
control signal may be warranted at an established
-
_ school crossing when a traffic engineering study of the
frequency and adequacy of gaps in the vehicular traffic
stream ns related to the number and size of groups of
school children at -the school crossing shows that the
number of adequate gaps in the traffic stream during the
period when the children are using the crossing is less
-the
than number of minutes in the same period.
'
When traffic control signals are installed entirely
under this warrant:
a._ Pedestrian indications shall be`provided at least
for each crosswalk established as a school crossing.
'
b. At an intersection, -the signal normally should -be
traffic -actuated. As a minimum,: it 'should. be semi-
emi-traffic-actuated,but
traffic-actuated,-,butfull actuation with detectors
on all approaches may be desirable. Intersection in-
stallations.that can be fitted into -progressive
'
signal systems may have pretimed control.
c. At -non
-intersection crossings, the -signal should
be pedestrian -actuated, parking and other obstructions
.to -view should be prohibited for at least 100 feet
in advance of and 20 feet beyond the crosswalk, and
the installation_should.include suitable standard
signs and pavement markings. Special police super-
vision and/or enforcement should be provided for a
new non -intersection installation,
-8
VIII
6.2.5 Warrant S, Progressive Movement
'
Progressive movement control sometimes necessitates traffic
where would
signal -installations at intersections -they,
,er
to maintain proper
'
not otherwisebewarrantcd,_in order
effectively regulate group speed.
grouping ofvehiclesand
Progressive Movement warrant is satisfied when:
'
The
a. On a one-way street or at whicdom
traffic, her adjeet acenthsignalshaseare�sontly
degree
'
unidirectional
far apart thatthey do provide the necessary
of vehicle platooning and speed control', or
-and
'
adjacent signaovide ,
b,_ -On a two-way street, signals do not pr
and speed control
the necessary degree of platooning
signals could constitute
-and the proposed and adjacent
'
a progressive signal system.
The installation of `a signal according to this warrant
speed unlessan
'
should be based on the 85 -percentile
thatanother speed is more
engineering study indicates
'
desirable.
The installation of a signal according to this warrant
signal
be considered where the resultant
should not
spacing would be less than 1,000 feet.
'
6.2.6 Warrant 6, Accident Experience
The Accident Experience warrant is satise:ied when:
'
a. Adequate trial of less restrictive rem edies with
has failed
satisfactory -observance and enforcement
and
— to reduce the accident frequency;
'
b. -Five or -more reported accidents, of types susceptible
have occurred
of correction by traffic signal control,
12 -month each accident involving
'
within a -period,
personal injury or property damage to an apparent
extent of $100 or more; and
c. -There exists a;volume :of vehicular
rements
'
traffic not less than 80 percent ofatheprequ
the minimum vehicular volume
- specified'either in
the minimum pedestrian volume warrant;
'
warrant, or
and
d. The signalinstallationwill not seriously disrupt
progressive traffic flow.
Any traffic signal installed solely on the Accident
-actuated
Experience warrant should, be semi -traffic
provide proper coordination
(with control devices which
within
'
if installed at an intersection ,a,coordinated
fully traffic -actuated
--
system)'and normally should be
if installed at an isolated intersection.
VIII -9
6.2.7 Warrant 7, Systems Warrant
A traffic signal installation at some intersections
may he warranted to,_encourage-concentration and organization
of .traffic flow networks.
The Systems warrant: is applicable when the common inter-
nter-
section-of
section of two or more major routes has a total existing,
or immediately projected, entering: volume, of at least
800 vehicles during the peak hour of a typical weekday,
or each of any five, hours of a Saturday and/or Sunday.
A major route as used in the above warrant has one or more
_ - of the following characteristics:`'
'
a. It is part of the street or highway system that
serves as the principal network for through traffic
flow;
b: It connects areas of principal-traffic _generation;
c. .It includes rural or suburban highways outside of,
entering or traversing a city; _
'
d. It has surface street freeway or expressway ramp
terminals;
'
- e. It appears as a major route on an official plan
such as a major street, plan in an urban area traffic
and transportation study.
'
6.2.8 Warrant
8, Combination of Warrants
In exceptional cases, signals occasionally, may be
justified where no single warrant is satisfied but
where two or more of Warrants 1, 2 and 3 are satisfied
to the extent of 80; percent or more of the stated
'
values.
Adequate trial of other remedial measures which cause
less delay and inconvenience to traffic should precede
'
installation of signals under this warrant.
6.3 Pedestrian signal indications shall be-installed in conjunction
with vehicular traffic signals (which meet one or more of the
traffic signal warrants previously ;set forth) under any of the
following conditions:
6.3.1 When a traffic signal is installed under the pedestrian
volume or school crossing warrant.
6.3.2 When an exclusive interval or phase is provided or made
available for', pedestrian movement in one or more directions,
with all conflicting vehicular movements; being stopped.
'
6.3.3 When vehicular indications are not visible to pedestrians
such as in one-way=streets, at "T"`intersections;or when
the vehicular indications are in a position which wnuid
adoquately serve pedestrians.
VIII-10
'
6.3.4 At established school crossings. at intersections
under any ntersections signalized
warrant.
6.3.5
Pedestrian signal indications also may be installed under
any of the folio -wing
„conditions: '
'
a:' When any volume of pedestrian activity requires use
of a pedestrian clearance interval
to minimize -
vehicle -pedestrian conflicts,
or when it is necessary
assist pedestrians in making a safe
_
crossing.
b.- When indications (as with
timin split -phase
g) would tend to confuse pedestrians
'
guided
only by vehicle signal indications.
C. When pedestrians cross part of the street to or
from an island, during a
'
particular interval (where
they should not be permitted
to c ross another part -
of that street B
Street 8 any part of the same interval). '
1
_
1
=
'
VIII -11
■
3
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-
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'
20 RIGHT
OF WAY
1
'
- SLOPE4'.
/
4/. SLOPE
1
,
L = ,16 FOR RESIDENTIAL
ALLEY,
20 FOR COMMERCIAL
ALLEY
rCITY
'1011A
OFCITY, I04;A
DEPARTMENT -OF PUBLIC SiORY.S
'
E14GINEERZIIG- DZVIST",
'
TYPICAL ALLEY CROSS-SECTION.
Figure 4
'
C.I. Mo'nho/e ><ra'rne
ar d: Cover (as r.6uirad) -
Yer77ah'R-1670(sul;d) -
A/ee»nh R-2500 (yr-faJ) Brick or concrete oz
or aguo 1. respired fo Max. of=4 to
1
tneef street grade, I7»e. -
Street grade /;»e Z4" Max. height of
- spacer t477. inclading
C:1. Manhole Frame. _-
1_
Grout frame fo :
Ma-hhOl a Wa l I s . r•. �, +'. p [ • ,'. �'. , �:
_ `o ., ,,.' Fla f TOP
>:
'
'•;
Ceme'"t SMI-ta/ jot'nfS rulth
9asKet as shoW77
or cold 6itummous com
ped Pound joists -made it ;
• U
vet 547»e 777a7l»er as sewer s. o
Qj w
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pa[ntnrou•»d�-
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puts/dt o>< joirE ;:• u •�
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a
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'
sewer 9»a'nho/Js a:, 4• dia. for"24 Pipe r U»der - °' OZ'
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bd
+� •
_co ••• • • _.`.• a ,I. •� [ a e
°
'
R- /990E J'ft•':e • ?;f. CITY OF IOWA- CITY, 7nWA
or •fLu.! �'. �'��•; '•;., _.'4 DEPARTMENT Oil ?F3ET.T6:.•;fi92•.Y�>:
1
' •`:� ••�• ENGINEERING DIVISION
7-7
TYPICAL MANHOLE 6' OR LESS
1
IN DEPTH
STEP DETAIL
Figure.6
''
• Street grade line •
—
C. 1, Ma-nhole fra?"a — Grout flame to manho le uva AT
'
and cover Caa tit logo Back or concre f e as
Neenah 8.1670 (gelid) 23 Min•topired toMax. o o.
i
Ale. enah R-25oo C9raiod)' i1•., 7neet si rect grade line.
or e$ual 24"Max: h.i ht of ---
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t
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or Cold b.tu7mrnous--com-
'
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- d Same 7na7)»er a5 Secuer •° i �
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'
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'
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require storm:.- :. -!U
-ol a;77 .:.
sewer manholes a `` 4'die. for 24• P•. •`Under
'
less -than 3 ft °. �.:
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: O • ' . Ori
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Na/011
R- 1980E _ !:,:•-"•• ! ;` �o CITY OF IOWA CITY, iC1WA
DEPARTMENT OF PUBLIC ?vOR:<S
ENGINEERING DiVlf;!Gi
- TYPICAL MANHOLE 6' OR MORE
'
IN DEPTH
STEP DETAIL
;Figure 7
1
Stanolard Vi/rifieo'_ Tee
Breok End of Tee
Necess4ry
i
I �
qs
Q
o.
N
Mc7nh0/e
°
5121210c Manho%
'
I
Bo&OM
Moi7ho/e Bgse
OroP conr�ecfior� fc- be used
'
{or a// P.P� e17f91-4n9 mon-
ho%s amore shah 24,.obov�:
_ _
'
'
ouf/ef pipe.
Fot 9CnCrq/ dii»ClxSio✓!a' _
CITY OF ;IOWA CITY, IOWA
o{ r"Qnh&e see SYgndwral
DEPARTMENT OF PUALIC,WORKS
'
4nho/e Qrow;n9•
ENGINEERING QIUISiow
'
SANITARY DROP CONNECTION
Figure 8
"C"
BEING
CLASS
NOTES:
'
PIPE SHALL BE LAID ON
'
UNDISTURBED SOIL.-
2. BELL HOLES SHALL BE HAND
SHAPEDSUCHTHAT,THE BARREL .
'
OF THE PIPE LIES ON UNDISTURBED
';-
SOIL.
3, BACKFILL SHALL BE HAND TAMPED-
'
JJJ
TO THE TOP OF ,THE PIPE.
/
UNDISTURBED
SOIL
1
CLASS
BEDDING
NOTES: ' -
�, PIPE BEDDING SHALL BE PLACED
ON UNDISTURBED SOIL AND
COMPACTED.
'
2, BELL HOLES SHALL BE HAND
SHAPED SUCH THAT THE BARREL
OF THE PIPE LIES ON COMPACTED
SEDDINGr
'
3. BACKFILL -SHALL BE HAND TAMPED
O
ov /
TO THE TOP OF THE PIPE.
/
2
I
UNDISTURBED
1
SOIL
CITY OF IOSYA CITY, I019A
'
DEPARTMENT OF PUBLIC WORKS
-
- P,t1rINEF.RING DTVT:3IO2',
PIPE BEDDING
Figure 10
Variable
Lengths
a .Q
r -r-1
------ r
•.
03
2'-0"min. o
1
"Wall`
Yr
E:=p0
°
......
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R-4670 or
---
22 •'x
48"-R- 4781 NEENAH
or equivalent
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Asphalt
', DtA a.
a .Q
`'
•.
2'-0"min. o
"Wall`
°
......
•.,
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Q•^
Variable Length
SECT (ON A -A
CITY OF IOWA CITY, IOWA
'
I, DEPARVIENT OF PU131,IC-:;OPKS
ENGINEERING,DIVISION
'
ALLEY CATCH BASIN
Figure 11
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CITY OF IOWA CITY, IOWA
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ENGINEERIPfr iSZVZ$ZG4f
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CITY 0FjI0WA CITY,-IOWA
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