(Statewide Urban Design and Specifications Program) - 2022 EDITION - CITY OF CEDAR RAPIDS, IOWA - Cedar ...
←
→
Page content transcription
If your browser does not render page correctly, please read the page content below
CITY OF CEDAR RAPIDS, IOWA
General Supplement to
SUDAS Design Manual
(Statewide Urban Design and Specifications Program)
2022 EDITION
CEDAR RAPIDS PUBLIC WORKS DEPARTMENT
CITY SERVICES CENTER | 500 15TH AVENUE SW | CEDAR RAPIDS, IA 52404
319-286-5802CEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022 Table of Contents Chapter 1 – General Provisions....................................................................................................................... 3 1C-1 Submittal Procedures ......................................................................................................................... 3 1D-1 Detailed Plans for Construction of Public Improvements .................................................................. 5 Chapter 2- Stormwater ................................................................................................................................... 7 2A-1 General Information ........................................................................................................................... 7 2C-1 Pavement Drainage and Intake Capacity............................................................................................ 8 2D-1 General Information for Storm Sewer Design .................................................................................... 8 Chapter 3 – Sanitary Sewers ........................................................................................................................... 9 3C-1 – Facility Design .................................................................................................................................. 9 Chapter 4 – Water Mains ................................................................................................................................ 9 4A-1 General Information ........................................................................................................................... 9 4B-1 Size Determination ............................................................................................................................. 9 4B-1 Multi Family, Commercial or Industrial Fire Flow .............................................................................. 9 4C-1 Facility Design ..................................................................................................................................... 9 Chapter 5- Roadway Design .......................................................................................................................... 11 5C-1 Geometric Design Tables .................................................................................................................. 11 5F-1 Pavement Thickness Design .............................................................................................................. 11 5L-4 Driveway Design Criteria ................................................................................................................... 11 5M-1 Complete Streets ............................................................................................................................. 11 5P – Retaining Walls along Public Roadways ............................................................................................ 11 Chapter 6- Geotechnical ............................................................................................................................... 13 6B-1 Subsurface Exploration Program ...................................................................................................... 13 6B-3 Geotechnical Report ......................................................................................................................... 13 Chapter 7- Erosion and Sediment Control .................................................................................................... 13 7B-1 Regulatory Requirements ................................................................................................................. 13 7C-1 The Erosion and Sedimentation Process........................................................................................... 13 Chapter 8 – Parking Lots ............................................................................................................................... 13 8A-1 General Information ......................................................................................................................... 13 Chapter 9- Utilities ........................................................................................................................................ 14 9A-1 General Information ......................................................................................................................... 14 Chapter 10- Street Tree Criteria.................................................................................................................... 14 10A-1 General Information ....................................................................................................................... 14 CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 1 2022 EDITION
CEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022 10B-1 Street Tree Criteria ......................................................................................................................... 14 Chapter 11- Street Lighting ........................................................................................................................... 14 11B-1 Luminaires ...................................................................................................................................... 14 11C-1 Facility Design ................................................................................................................................. 14 Chapter 12- Sidewalks and Bicycle Facilities ................................................................................................. 14 12A-1 General Sidewalk Requirements .................................................................................................... 14 12A-2 Accessible Sidewalk Requirements ................................................................................................. 15 Chapter 13 Traffic Signals ............................................................................................................................. 15 13A-1 General Information ....................................................................................................................... 15 Figure CR 9A-1.01 Typical Urban Utility Locations........................................................................................ 17 CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 2 2022 EDITION
CEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022
CITY OF CEDAR RAPIDS
GENERAL SUPPLEMENT TO SUDAS DESIGN MANUAL
2022 EDITION
Any reference to supplemental documents is intended as a reference to the Cedar Rapids General
Supplement to SUDAS Design Manual.
Chapter 1 – General Provisions
1C-1 Submittal Procedures
A. Construction Plans and Specifications Submittal Procedure: Refer to Cedar Rapids Project
Development and Management Manual for design submittal procedure.
Add the following:
Design Survey Standards
These standards are established to ensure correct and sufficient field information is utilized by
designers and to standardize basic information presented on construction drawings for public
improvement projects and private developments with facilities that will be accepted by the City.
These specifications are considered minimum standards for design survey information.
Additional information may be included in Cedar Rapids Project Development and Management
Manual and project development agreements.
All design survey shall be performed directly by or under responsible charge of a Professional
Engineer or Professional Land Surveyor licensed in the State of Iowa.
References
Cedar Rapids Coordinate System:
Name: US State Plane 1983
Datum: NAD 1983 (NA2011)
Zone: Iowa North 1401
Geoid: GEOID12A (Conus)
Vertical Datum: NAVD88
Linn County, Iowa Control Network
2013 Adjustment
Geoid 12A
All vertical control shall be based on the Linn County, Iowa Control Network (2013 Adjustment)
or United States Public Land Survey Corner Certificates, (which reference the Linn County, Iowa
Control Network (2013 Adjustment)) available from the Linn County, Iowa Recorder’s office.
Include a list of all horizontal and vertical control points used for the project design in the
construction drawings per SUDAS Design Manual Section 1D-1.B. Additional reference
information is available from the City of Cedar Rapids Information Technology Department – GIS
Division.
CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 3 2022 EDITIONCEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022
Acceptable methods for establishing coordinates and elevations of horizontal and vertical
control monuments include, but are not limited to, traditional traversing, differential leveling,
and adjustment of these measurements utilizing a minimum of two area ground control
monuments. Real Time Kinematic (RTK) GPS survey methods utilizing one or more of the area
ground control monuments as a base station, may be used, provided an independent check of
the resulting information using traditional methods between all vertical and horizontal control
points set in this manner is made. All records of these procedures shall become property of the
City.
Accuracy
Accuracy for establishing horizontal and vertical control monuments shall meet standards set by
the Federal Geodetic Control Committee (FGCC) for Third Order Surveys (1:10,000).
Data Collection for Design Surveys
Sufficient topographic and underground data shall be collected to make standard design
practices possible. All data collected must meet requirements of the specific project. Project
Engineer shall determine limits of the areas to be surveyed. Special attention shall be given to
the project design limits to obtain horizontal and vertical information to ensure a clean and
smooth transition from the existing features to the new project features.
Most data collected will be in the form of coordinates including a northing, easting, and a
vertical elevation. It will be necessary to reference existing coordinate systems, such a stationing
or another coordinate system. Sufficient data must be obtained from these existing systems to
utilize them during design.
a. Horizontal Control Monuments
Permanent horizontal control monuments (traverse points) shall be, but are not limited to,
landscape spikes, rebar or pipe of substantial length and diameter securely embedded in
undisturbed ground. Crosses cut into concrete pavement or structures, or nails set in asphalt
pavement may be used for horizontal and control monuments. Hubs, nails in ground, inked
marks on concrete or similar are not considered permanent, but may be used as temporary
control points during data collection.
All permanent horizontal control monuments shall be referenced to local physical features by
horizontal measurements or description to allow for future recovery. Such references shall be
included in the construction drawings.
A network of horizontal control monuments encompassing the entire project limits shall be
provided. A minimum of two permanent horizontal control monuments, within sight of each
other and no greater than 600 feet apart, shall be provided for each construction site.
Each horizontal control point shall be described with a north and east coordinate and may
Include an elevation. However, some horizontal control monuments may not be acceptable as
benchmarks, as described in c. Vertical Control Monuments.
CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 4 2022 EDITIONCEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022
b. Vertical Control Monuments
Permanent vertical control monuments (benchmarks) shall be local physical features that are
permanent and not at a risk of change in elevation due to frost, normal wear and tear, or any
vertical movement.
Permanent vertical control monuments may include, but are not limited to, braced nails or
double nails in bases of power poles and trees, fire hydrants, abutment walls, and concrete
structures that extend below the frost line. Markings on concrete structures such as sidewalks,
curbs, concrete pads, or other fixtures that do not extend below the frost line are not
considered permanent, but may be used as temporary control points during data collection.
A network of vertical control monuments encompassing the entire project limits, shall be
provided. A minimum of two permanent vertical control monuments (benchmarks) no greater
than 600 feet apart, shall be provided for each construction site. More may be required based
on the land topography.
All permanent vertical control monuments (benchmarks) shall be referenced and described
using local physical features to allow for future recovery. Such references shall be included in
the construction drawings.
c. Underground Utility Locations
All surveys shall include written and electronic record information provided by local utility
companies for underground features, along with field information on visible utility markings
located at the site by means of the Iowa One-Call service (1-800-292-8989) in accordance with
requirements identified in the design contract document.
Existing utility location information shall be collected based on ASCE Document CI/ASCE 38-02
Standard Guideline for the Collection and Depiction of Existing Subsurface Utility Data. The
quality of the utility location shall be identified per the appropriate quality level classification.
d. Ownership of Data
All information collected by the designer and/or surveyor for City improvement projects shall
become property of the City.
1D-1 Detailed Plans for Construction of Public Improvements
Revisions to Plan Organization Table:
F Sheets – Driveway Profiles (Profiles may also be included on Cross Section Sheets)
P Sheets – Permanent Paving Markings/Permanent Signing
Q Sheets – Removal Sheets
T Sheets – Earthwork Quantity Sheets/Soil Sheets
V Sheets – Retaining Walls
Y Sheets – Landscaping Plans
1D-1A Public Improvement Plan Sheet Requirements: 4. Title Sheet Add to item i. as follows:
A signature block is required for the licensed surveyor certifying information provided on the
“G” and “H” sheets
CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 5 2022 EDITIONCEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022
1D-1C.7 Detailed Sanitary and Storm Sewer Plans: Item 7. Location, size, and type of all sewer
stubs and wyes. Reference stub locations to the nearest manhole. When risers are to be
installed, show riser location and size.
Add 1D-1 J Right of Way Plans
Right-of-way plan sheets, when provided within a construction plan set, should be laid out to
clearly and accurately depict all easement and acquisition limits in relation to existing property
and right-of-way boundary lines. Information related to construction details should not be shown
on right-of-way plans. The right-of-way plans should be orientated and scaled to match
construction plan sheets (typically the D and E sheets). The following is list of items that should
be included:
1. Existing physical features and proposed improvements including grading limits
2. Existing easements and property lines
3. Found monuments
4. Existing and proposed ROW
a. Utilize the Iowa Department of Transportation ROW Design Symbols in Appendix D of the
Right of Way Design Manual.
5. Area of proposed ROW
6. Grading limits
7. Property ownership
8. Parcel numbers
a. Each parcel within a project’s limits must have a numerical parcel number assigned to it.
The numbering shall start at the beginning of the project (either the west or south limit),
on the right side. The numbering shall continue on that side to the end of the project,
switch to the other side, and go back to the beginning of the project. Once parcel numbers
have been assigned, they shall not be changed.
9. Aerial photo
10. If Parcel Impact Details are not provided with the acquisition documents, show all impacts
that the project has on each parcel. This may include specific removals of concern to the
property owner.
CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 6 2022 EDITIONCEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022
Chapter 2- Stormwater
2A-1 General Information
“All City owned storm sewer piping (including culverts) shall be concrete pipe. This includes all
piping located within and outside of street right-of-way, as well as, storm sewer piping that will
be dedicated to the City following project completions. Use of other piping materials requires
specific written approval by the Public Works Storm Sewer Department.”
C. Conditions: Refer to Cedar Rapids City Code, Chapter 72 Stormwater Management.
C.3 Add the following:
As much as possible, locate all stormwater conveyance features and/or facilities on a single
parcel to simplify identification of ownership and maintenance responsibility of the feature or
facility. These also may be located on a platted outparcel or common/association property such
that the responsibilities may be distributed to all benefited property owners.
A detailed maintenance plan which identifies inspection and maintenance procedures to ensure
the long term function of the facilities is required. The plan shall identify the components of the
stormwater conveyance system requiring maintenance, equipment and skills necessary for
maintenance and the frequency of inspection and maintenance. The necessity for a recorded
agreement with the property owner or association shall be determined at the time of approval
of the site plan or final plat submittal. Maintenance requirement shall comply with Section
72.203 of the Cedar Rapids City Code and Section 2G, F.4 of the SUDAS Design Manual.
D. Unified Sizing Criteria: Delete content of Table 2A-1.01 and replace with the following:
Stormwater quality requirements shall be addressed in the design of the stormwater
management per the criteria in Table CR 2A-1.01.
Table CR 2A-1.01 Summary of the Recommended Unified Stormwater Sizing Criteria for Management of
Stormwater Quality and Quantity
Sizing Criteria Required Method
Water Quality Runoff that is generated from a 1.25 inch rainfall event shall be captured and
Volume (WQv) treated using appropriate stormwater Best Management Practices (BMPs). The
WQv shall be calculated in accordance with Chapter 2 of the current Iowa
Stormwater Management Manual (ISWMM) and calculations provided in the
Engineer’s drainage report.
For new development projects, the WQv shall be calculated based on the entire
site, not just impervious areas.
For redevelopment projects that result in 0.5 acre or more of land disturbance, the
WQv shall be calculated as follows:
If less than 50 % of the site is disturbed, WQv shall be based on the increase of
the impervious area, not the entire site.
If 50% or more of the site is disturbed, WQv shall be based on the area of the
entire site.
The BMP practice selected by the applicant/owner, to capture and treat the WQv
shall be selected and designed in accordance with the ISWMM. Where favorable
soil conditions are present, infiltration based practices are highly encouraged. The
submitted report shall show a map of the site area upon which the WQv is based.
CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 7 2022 EDITIONCEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022
Recharge Infiltrate a fraction of the WQv based on the annual recharge rate of the hydrologic
Volume (Rev). soil group existing on the site. The Rev shall be calculated in accordance with
Chapter 2 of the Iowa Stormwater Management Manual.
Channel Provide extended detention for the post-development runoff generated in a 1-year,
Protection 24 hour storm per NOAA Atlas 14 such that the volume is released over 24 hours.
Storage The Cpv shall be calculated in accordance with Chapter 2 of the Iowa Stormwater
Volume (Cpv) Management Manual.
Overbank Provide peak discharge control of the runoff generated in 2-year through 5-year, 24
Flood hour storm per NOAA Atlas 14 such that the post-development discharge does not
Protection: exceed pre-development discharge rates.
(Qp)
Extreme Flood Provide peak discharge control for runoff generated from all storms larger than the
Protection (Qf) 5-year, 24 hour storm up to the 100-year, 24 hour storm such that post-
development discharge does not exceed the peak discharge rate for the 5-year, 24
hour storm.
All components of the Unified Sizing Criteria shall apply in the design of Stormwater Management
facilities. Deviations from the Unified Sizing Criteria requires approval of the Jurisdictional Engineer.
2C-1 Pavement Drainage and Intake Capacity
Add the following numbered subparagraph under B. Design Criteria:
4. Subdrain Design: Adequate drainage of roadway subgrades and subbases is essential to extending
pavement life. On City Capital Improvement Program projects involving full roadway reconstructions in
established neighborhoods, subdrains should be considered along all curblines, including parallel and
adjacent to mainline storm sewers. Roadway designers should determine the number of potential
private footing drain and sump pump discharge lines that could be connected to the roadway subdrains
and provide fittings and a stub to right-of-way, or a suitable distance onto private property, for all such
potential connections. Subdrain pipes shall be sized to accommodate potential flows from both private
connections and from the roadway pavement subbase.
2D-1 General Information for Storm Sewer Design
Replace Section 2D-1,D.,1. with the following:
The recommended minimum cover of subgrade over storm sewer pipes is 18 inches or as specified by
the type of pipe as described in Chapter 9 - Utilities, whichever is greater. Where the clearance below
subgrade is less than 18-inches, the Project Engineer will provide a design sufficient to maintain the
integrity of the pipe and pavement. For storm sewer pipe more than 5-feet outside of the pavement
footprint, the minimum cover should be 1 foot or as specified by the type of pipe (described in Chapter 9
- Utilities), whichever is greater.
Add as a separate paragraph to E. Horizontal Alignment:
Where storm sewer is located under street pavement, such as where a street is curved and the straight
storm sewer pipe is located under the pavement, subdrain and/or sump pump services should not
directly connect to the concrete storm sewer pipe. The subdrain and/or sump pump service should
connect to a subdrain installed behind the back of curb, which should then connect to the storm sewer
via a manhole or intake.
CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 8 2022 EDITIONCEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022
Chapter 3 – Sanitary Sewers
3C-1 – Facility Design
Replace Section 3C-1, E. Minimum Grade, with the following:
See Table 3C-1.01 below for the minimum slopes for each pipe diameter. It is recommended that
design slopes of 150% of the minimum slopes are used. Minimum grade on sanitary sewer service
stubs should be 1/4 inch per foot.
Chapter 4 – Water Mains
4A-1 General Information
B. Conditions: Add the following paragraph:
4. The City of Cedar Rapids performs taps for service connections. Developers are
responsible for the repair of any piping system that fails when a tap is made. Developers
may wish to include provisions for this occurrence in agreements with Contractors.
Development agreements shall describe the Developer’s responsibility for providing for
these repairs as part of any bonds required by the City.
4B-1 Size Determination
D.3. Pressure Requirements: Replace the existing paragraph with the following: The
recommended minimum operating pressure of the distribution system should be no less than 45
psi. The residual pressure required under fire flow conditions should not drop below 20 psi at any
hydrant of any point in the system. When operating pressure exceeds 100psi, individual or
system pressure reducing devices may be required.
4B-1 Multi Family, Commercial or Industrial Fire Flow
Add E.4.c Fire Department declares that in 2019 the City of Cedar Rapids has adopted the 2018
International Fire Code
4C-1 Facility Design
B.1. Water Mains: Replace item 1 with the following:
Water main pipe will typically be ductile iron pipe (DIP); and meet AWWA Standards.
The use of PVC pipe up to 12 inches in diameter is allowed in new residential
development, new commercial development, and as isolation spool pieces with cathodic
protection systems. If PVC is utilized in locations where static water pressures exceed
100 PSI, DR 14 pipe thickness is required.
Where distribution systems and service connections are installed in areas of known
groundwater contaminated by organic compounds (e.g. LUST), pipe and joint materials
(non-PVC pipe) that do not allow permeation of the organic compounds must be used.
PVC pipe shall not be used within 1,000 ft. of a contaminated site.
The Iowa DNR requires underground storage tank (UST) owners to meet specific design
requirements for USTs installed within 1,000 feet of a community water system. The
Project Engineer should determine if there is an UST within 1,000 feet of the project
area. If so, the Designer should determine the need to design the water mains to
prevent future permeation of any organic compounds into the water system. There are
CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 9 2022 EDITIONCEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022
various elements to consider, some of which include soil types, groundwater table
depth, size of the UST, age of the UST, etc. Consult with manufacturers concerning
permeation of the pipe walls, jointing materials, valve seats, etc.
B.3. Water Mains: Replace item 3 with the following: New main installation should be located
in the parking area (between the curb and the property line) of the right-of-way and a distance
of 9-10 feet from the right-of-way line.
B.5. Water Mains: Replace item 5 with the following: Water mains should be designed with a
minimum cover of 5.5 feet for 8 inch diameter mains. Greater depth of cover, surface loading
conditions, or unusual trench conditions may require a stronger class of pipe according to the
AWWA Standard regarding the type of pipe being installed. Where a dip must be placed in a
main in order to pass under another utility, the length of the deeper main should be kept to a
minimum, and bends should be considered to affect the desired offset.
B. Water Mains: Add the following paragraph:
7. Deflection of water main systems shall not exceed the following limits:
i. DIP: Limit joint deflections to one degree less than pipe manufacturer’s
recommended maximum limit.
ii. PVC: Limit joint deflections to 4 inches maximum offset per joint, or less per
manufacturer’s recommended maximum limit. No deflection of the pipe is
allowed.
D. Valves: Add the following paragraph:
7. When designing service connections for Critical Facilities (i.e. Hospitals, Clinics, Schools,
etc.) it is recommended that a valve be installed on each side of the service tee, and a
service valve also be installed on the outlet.
CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 10 2022 EDITIONCEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022
Chapter 5- Roadway Design
5C-1 Geometric Design Tables
Replace Table 5C-1.01 Footnote 9 with the following:
For local, low volume residential streets, two free flow lanes are not required and a 27 foot or
31 foot (back to back) roadway may be used where parking is allowed on one side or both
sides respectively. For higher volume residential streets, which require two continuously free
flowing traffic lanes, a 31 foot or 37 foot roadway should be used for one sided or two sided
parking respectively. The minimum street width with parking on one side stipulated in the
2018 International Fire Code is 27 foot back to back. Narrower street widths will not be
allowed where parking is allowed on one side.
5F-1 Pavement Thickness Design
D. Determining Pavement Thickness: Add the following: “Minimum pavement section for rigid
pavements is 7 inch PCC with 6 inch granular subbase and subbase preparation per SUDAS
Standard Specifications Section 2010.”
5L-4 Driveway Design Criteria
Replace 5L-4,C..,3.,a. with the following:
Single Family (SF) Residential: Each SF residential property is limited to one access point.
However, where houses are located on corner lots, have extra wide frontage (120' or more), or
on heavy traveled roadway more than one access point may be allowed to eliminate backing
out on a heavily traveled roadway. See jurisdiction policy for specific requirements.
5M-1 Complete Streets
C. 13 Transit: Add the following: “Consult with the Cedar Rapids Transit Department for bus stop
locations, shelter dimensions, and bus stop pad requirements.”
5P – Retaining Walls along Public Roadways
A. Introduction
Historically, City policy and practice on construction, ownership and maintenance of retaining walls on
capital improvement projects has not been well documented or consistent. This guidance is intended to
provide project engineers, managers and designers a framework for design decisions, including
acquisition needs on projects.
B. Location
Retaining walls are usually required in hilly areas to provide space for a proposed public sidewalk or
roadway.
Typically, retaining walls should be placed so the exposed face of wall is on right-of-way. However, if
doing so adversely affects an existing public or private structure, requires removal of an excessive
number of trees, or adversely impacts the property owner’s reasonable use of their property, placing the
retaining wall in City right-of-way is an option.
CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 11 2022 EDITIONCEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022
If the wall is placed in City right-of-way, existing and proposed utilities and pedestrian facilities must
be accommodated, along with maintaining required horizontal clearances from roadway travel lanes.
C. Wall Design Factors and Options
A number of factors must be considered when evaluating and selecting a retaining wall type including,
but not limited to the following:
• Required wall height to protect private property above or below the wall as applicable.
• Available space for wall construction, i.e. proximity of existing buildings, walks, driveways,
railroads, utility facilities.
• Protection of trees and minimizing grading.
• Residential, commercial or industrial area.
• Aesthetics.
Typical wall design types can include, but are not limited to the following:
• Segmental block
• Combined sidewalk/retaining wall (based on SUDAS Figure 9072.221).
• Cast-in-place
• Soil nail
• Drilled anchor/tilt up panel
D. Maintenance and Repair Responsibilities
In general, walls above a certain height, or that would be difficult for a private property owner to repair
or replace, should remain City responsibility. In these cases, permanent easements for future
maintenance, repair or reconstruction should be obtained during the acquisition phase for a project.
SUDAS requires segmental block walls be designed by an engineer licensed in IA. Wall design
includes defined excavation limits, select backfill and drain tile behind the blocks. As the wall gets
taller, geo-grid anchored to the blocks, and embedded in the select backfill, is added at intervals. The
geo-grid allows the backfill and the blocks to act in concert for stability. Geo-grid is usually
incorporated in the design of segmental block walls greater than 3-feet in height above grade. The
general consensus of Public Works/Engineering is it is difficult for a private property owner to effect
repairs to a wall with geo-grid embedded in the backfill. Accordingly, segmental block walls 3-feet or
greater in height should remain a City responsibility and permanent easements be obtained for that
purpose.
Combined sidewalk/walls, cast-in-place walls, soil nail and drilled anchor/tilt-up walls should remain a
City responsibility. If topography requires that the wall extends further onto private property to
accommodate a driveway or other access, permanent easements for the wall must include these portions.
E. Safety
According to Building Services, fences and/or railings are required along the top of walls if the sidewalk
or pedestrian path is above the wall and if there is greater than a 3-foot drop off.
If the area above the wall is private property and there is no sidewalk, the property owner may request a
fence and/or railing be included during property acquisitions. These requests should be respected.
CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 12 2022 EDITIONCEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022
Chapter 6- Geotechnical
6B-1 Subsurface Exploration Program
A. General Information: Add the following: Subsurface exploration is required for design of
sewers and utilities greater than 6 feet below ground surface. The purpose of the exploration
for utility design is to describe the disposition of the material within the proposed utility
envelope and to determine the relevant engineering characteristics of the materials.
C. Site Characterization
1. Frequency and Depth of Borings: Add items g. and h.
g. Utilities (Trenched): Maximum of 400 feet spacing along the utility. Depth shall be to a
minimum of 5 feet below the design flow line.
h. Utilities (Bored): Minimum of 3 borings along length of utility run; one at each end of the
proposed installation and one midpoint along the proposed length. Depth shall be to a
minimum of 5 feet below the design flow line.
6B-3 Geotechnical Report
A. Geotechnical Report: Add the following: As a minimum, information determined from utility
borings shall include: soil type, soil properties, soil moisture content, groundwater conditions
and the presence of rock or other obstacles. A discussion regarding suitability of existing soil for
backfill and compaction requirements should be included in the report.
If the presence of contaminated soils and/or groundwater is suspected, the Engineer should be
consulted for direction regarding sampling and evaluation.
Chapter 7- Erosion and Sediment Control
7B-1 Regulatory Requirements
Add to C.3.b.6 bullet item 1 “Refer to Cedar Rapids City Code, Chapter 71 Sediment and Erosion
Control.”
7C-1 The Erosion and Sedimentation Process
Add item to B: 6. State and Local Requirements;
• “Section 199 (Utilities) Chapter 9 “Restoration of Agricultural Lands During and After
Pipeline Construction” establishes standards for the restoration of agricultural lands
during and after pipeline construction. Agricultural lands disturbed by pipeline
construction shall be restored in compliance with these rules. These requirements do
not apply to land located within city boundaries, unless the land is used for agricultural
purposes, or to interstate natural gas pipelines. These rules shall constitute the
minimum land restoration standards for any pipeline construction.”
Chapter 8 – Parking Lots
8A-1 General Information
Refer to Cedar Rapids City Code, Chapter 32 Zoning, Section 32.04.02 Parking.
CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 13 2022 EDITIONCEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022
Chapter 9- Utilities
9A-1 General Information
C. Design: Delete Figure 9A-1.01 Typical Urban Utility Locations and replace with Figure CR 9A-
1.01.
Chapter 10- Street Tree Criteria
10A-1 General Information
Refer to Cedar Rapids City Code, Chapter 32 Zoning, Section 32.04.06, Landscaping, Buffering,
and Screening.
10B-1 Street Tree Criteria
C. Location within Public Right-of-Way: Replace item 1 with the following: Minimum distance of
10 linear feet from water service stop boxes.
10B-1.E Selection of Trees: Refer to City of Cedar Rapids Parks and Recreation- Forestry
Department website for allowable species, sizing, and spacing requirements.
Chapter 11- Street Lighting
11B-1 Luminaires
All luminaires in Cedar Rapids shall be LED (light emitting diode).
11C-1 Facility Design
11C-1.B.1. Design Criteria: Contact Cedar Rapids Traffic Engineer for light pole details and
spacing.
Chapter 12- Sidewalks and Bicycle Facilities
12A-1 General Sidewalk Requirements
12A-1.B. Figure 12A-1.01: Classes of Sidewalk
Class B and Class C Sidewalk widths are 5’ minimum. Minimum sidewalk widths shall be
determined by street classification per the following table:
Minimum Sidewalk Width per Street Classification (feet)
Local/Collector/Minor Arterial Major Arterial
5 6
12A-1.D. Construction Requirements
Add to paragraph 1. Sidewalk Thickness: Sidewalks should be constructed of PCC with a minimum
thickness of 5” when 6’ wide or greater.
Add the following:
4. Fall Protection: If the sidewalk or pedestrian path is located on the high side of a retaining
wall, and the height of the retaining wall is 3’ or more, a fence or safety rail is required for fall
protection. Approval of the Jurisdiction is required for fence or rail material selection.
CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 14 2022 EDITIONCEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022
12A-2 Accessible Sidewalk Requirements
12A-2.E Standards for Accessibility
Refer to Supplemental Specifications Figures 7030.999.204 – 7030.999.209.
12A-2.E.4.b Technical Requirements
3). Width: The minimum width of a curb ramp is 5 feet, excluding curbs and flares.
7). Turning Space: c) Size: The turning space shall be a minimum of 5 feet by 5 feet.
Figure 12A-2.07: Curb Ramp Turning Spaces: All turning spaces shall be a minimum of 5 feet
by 5 feet.
Chapter 13 Traffic Signals
13A-1 General Information
A. Introduction: The purpose of this chapter is to supplement the Cedar Rapids Standard
Supplemental Specification to SUDAS 8910 Traffic Signals and to provide general guidance for
traffic signal designs on roadways within Iowa. The information is provided as an overview for
traffic signal design consideration.
CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 15 2022 EDITIONCEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022 Figure CR 9A-1.01: Typical Urban Utility Locations (DELETE) (Continued) CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 16 2022 EDITION
CEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2022 Figure CR 9A-1.01 Typical Urban Utility Locations CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 17 2022 EDITION
You can also read
