General Supplement to SUDAS Design Manual

CITY OF CEDAR RAPIDS, IOWA

General Supplement to SUDAS Design Manual

(Statewide Urban Design and Specifications Program)

2021 EDITION

CEDAR RAPIDS PUBLIC WORKS DEPARTMENT

CITY SERVICES CENTER | 500 15TH AVENUE SW | CEDAR RAPIDS, IA 52404 319-286-5802

CEDAR RAPIDS SUPPLEMENT TO SUDAS DESIGN MANUAL JANUARY 2021

CITY OF CEDAR RAPIDS | PUBLIC WORKS Page 1 2021 EDITION

Table of Contents Chapter 1 – General Provisions ....................................................................................................................... 3

1C-1 Submittal Procedures ......................................................................................................................... 3

1D-1 Detailed Plans for Construction of Public Improvements .................................................................. 5

1H-1 Design Survey Standards .................................................................................................................... 6

Chapter 2- Stormwater ................................................................................................................................... 6

2A-1 General Information ........................................................................................................................... 6

2C-1 – Pavement Drainage and Intake Capacity ......................................................................................... 7

Chapter 4 – Water Mains ................................................................................................................................ 8

4A-1 General Information ........................................................................................................................... 8

4B-1 Size Determination ............................................................................................................................. 8

4B-1 Multi-Family, Commercial or Industrial Fire Flow .............................................................................. 8

4C-1 Facility Design ..................................................................................................................................... 8

Chapter 5- Roadway Design ............................................................................................................................ 9

5F-1 Pavement Thickness Design ................................................................................................................ 9

5M-1 Complete Streets ............................................................................................................................... 9

5P – Retaining Walls along Public Roadways .............................................................................................. 9

Chapter 6- Geotechnical ............................................................................................................................... 11

6B-1 Subsurface Exploration Program ...................................................................................................... 11

6B-3 Geotechnical Report ......................................................................................................................... 11

Chapter 7- Erosion and Sediment Control .................................................................................................... 11

7B-1 Regulatory Requirements ................................................................................................................. 11

7C-1 The Erosion and Sedimentation Process ........................................................................................... 11

Chapter 8 – Parking Lots ............................................................................................................................... 12

8A-1 General Information ......................................................................................................................... 12

Chapter 9- Utilities ........................................................................................................................................ 12

9A-1 General Information ......................................................................................................................... 12

Chapter 10- Street Tree Criteria.................................................................................................................... 12

10A-1 General Information ....................................................................................................................... 12

10B-1 Street Tree Criteria ......................................................................................................................... 12

Chapter 11- Street Lighting ........................................................................................................................... 12

11B-1 Luminaires ...................................................................................................................................... 12

11C-1 Facility Design ................................................................................................................................. 12



Chapter 12- Sidewalks and Bicycle Facilities ................................................................................................. 12

12A-1 General Sidewalk Requirements .................................................................................................... 12

12A-2 Accessible Sidewalk Requirements ................................................................................................. 13

Chapter 13 Traffic Signals ............................................................................................................................. 13

13A-1 General Information ....................................................................................................................... 13

Figure CR 9A-1.01 Typical Urban Utility Locations ........................................................................................ 15



CITY OF CEDAR RAPIDS

GENERAL SUPPLEMENT TO SUDAS DESIGN MANUAL 2021 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 surveys shall be performed directly by or under the 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 the 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.

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 the 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 the requirements of the specific project. The Project Engineer shall determine the limits of the areas 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 an 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 accepted as benchmarks, as described in c. Vertical Control Monuments.



b. Vertical Control Monuments Permanent vertical control monuments (benchmarks) shall be local physical features that are permanent and not at 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 utilizing the Iowa One-Call service (1-800-292-8989) per 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 the 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) N Sheets – Traffic Signal Sheets, or Lighting Layout 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

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 section: 1H-1 Design Survey Standards Refer to Cedar Rapids Project Development and Management Manual for design submittal procedure.

Chapter 2- Stormwater 2A-1 General Information “All City-owned storm sewer piping (including culverts) shall be a 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 the 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 it 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 Volume (WQv)

Runoff that is generated from a 1.25-inch rainfall event shall be captured and treated using appropriate stormwater Best Management Practices (BMPs). The WQv shall be calculated per 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 in impervious areas. For redevelopment projects that result in 0.5 acres 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 per 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.

Recharge Volume (Rev).

Infiltrate a fraction of the WQv based on the annual recharge rate of the hydrologic soil group existing on the site. The Rev shall be calculated per Chapter 2 of the Iowa Stormwater Management Manual.

Channel Protection Storage Volume (Cpv)

Provide extended detention for the post-development runoff generated in a 1-year, 24-hour storm per NOAA Atlas 14 such that the volume is released over 24 hours. The Cpv shall be calculated per Chapter 2 of the Iowa Stormwater Management Manual.

Overbank Flood Protection: (Qp)

Provide peak discharge control of the runoff generated in 2-year through 5-year, 24-hour storm per NOAA Atlas 14 such that the post-development discharge does not exceed pre-development discharge rates.

Extreme Flood Protection (Qf)

Provide peak discharge control for runoff generated from all storms larger than the 5-year, 24-hour storm up to the 100-year, a 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 the 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, sub drains should be considered along all curb lines, 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 sub drains 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 the roadway pavement subbase.

Chapter 4 – Water Mains 4A-1 General Information

A. 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 a 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 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 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 the 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.

Chapter 5- Roadway Design 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.”

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 have 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 the wall is on the 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.

If the wall is placed in the 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 Many 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 to 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, a 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 consensus of Public Works/Engineering is it is difficult for a private property owner to effect repairs to a wall with a geo-grid embedded in the backfill. Accordingly, segmental block walls 3-feet or greater in height should remain a City responsibility and permanent easements are 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.

Chapter 6- Geotechnical 6B-1 Subsurface Exploration Program

A. General Information: Add the following: Subsurface exploration is required for the design of sewers and utilities greater than 6 feet below the 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 beside the utility. The depth shall be to a minimum of 5 feet below the design flow line. h. Utilities (Bored): Minimum of 3 borings along the length of utility run; one at each end of the proposed installation and one midpoint along the proposed length. The 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 the 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.

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

Residential 5 5 5 Commercial/Office 5 5 6 Industrial 5 5 5

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.

12A-2 Accessible Sidewalk Requirements

12A-2.E Standards for Accessibility Refer to Supplemental Specifications Figures CR 7030.204 – CR 7030.209.

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 CR-8010 Traffic Signals and to provide general guidance for traffic signal designs on roadways within Iowa. The information is provided as an overview of traffic signal design consideration.



Figure CR 9A-1.01: Typical Urban Utility Locations (DELETE)

(Continued)



Figure CR 9A-1.01 Typical Urban Utility Locations

General Supplement to SUDAS Design Manual

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