2021 Infrastructure Design Manual (IDM) - Houston Permitting ...

EXECUTIVE SUMMARY

2020-2021 Review Cycle

The following executive summary highlights the implementation and some of the major updates to the

City of Houston’s (City) Infrastructure Design Manual (IDM), General Requirements, Standard

Construction Specifications, and Standard Drawings from the 2020-2021 review cycle.

GENERAL CHANGES

The July 2021 Infrastructure Design Manual, General Requirements, and Standard Construction

Specifications show change bars on the left side of the page to indicate a major revision has taken place.

For specific details on what changes took place, redlines will be posted on the Design and Construction

Standards website for reference.

AASHTO HS-20 vehicular design loading requirement has been changed to HL-93 loading as defined by

AASHTO LRFD Bridge Specifications. This has been carried out across the entire IDM and Standard

Specifications.

INFRASTRUCTURE DESIGN MANUAL (IDM)

Chapter 3 Graphic Requirements

Chapter 3 – Graphic Requirements was not officially part of the 2020-2021 review cycle. Due to the

addition of boring log requirements for Drawings in chapter 11, geotechnical drawing requirements have

been added to chapter 3 along with 2 example plan sheets. Electronic document data format submittal

requirements were added to chapter 7, therefore chapter 3 electronic document data format submittal

requirements have been added.

Chapter 6 Utility Locations

Chapter 6 – Utility Locations was not officially part of the 2020-2021 review cycle. During the review of

chapter 7, new Subsurface Utility Engineering (SUE) requirements were added. The levels of SUE were

defined and added to chapter 6 to provide clarity to requirements in chapter 7.

Chapter 7 Water Line Design Requirements

Chapter 7 – Water Line Design Requirements is now organized into sections for easier navigation and

referencing. Dead-end lines will no longer be permitted and existing dead-ends near proposed water

lines will be evaluated for connection and dead-end elimination. New requirements for small diameter air

valves, open cut construction, connection to existing water lines, joint restraint systems and trace wire

for non-metallic pipes have been added. Submittal requirements for As-Built drawings have been added.

Revisions have been made regarding water lines within cul-de-sacs, water meter service and water line

crossings. Requirements for depth of cover and vertical clearance at water line crossings have been

updated. New tables defining minimum horizontal and vertical separation at Large Diameter Water Line

(LDWL) crossings have been added to the Appendix. New requirements for LDWL on minimum easement

widths, water line shutdown and installation parallel to existing LDWL have been added to the Appendix.

Geotechnical and environmental requirements for LDWL have been removed and the article now refers

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EXECUTIVE SUMMARY


to Chapter 11 IDM requirements. Improvements to corrosion control and on the SUE requirements have

been made in Appendix. Reference to Chapter 13 GIS Data Digitization has been added.

Chapter 8 Wastewater Collection System Design Requirements

Chapter 8 – Wastewater Collection System Design Requirements is now organized into sections

for easier navigation and referencing. It has a new requirement that outlines conditions for

when a connection to a backlot easement is allowed. The definition section, manhole vent spacing,

manhole cover placement location and bolting and gasketing requirements for manholes in flood plain

have been updated. The minimum size of commercial service leads and requirement for commercial

service lead to terminate at a manhole has been updated. Reference to Chapter 13 GIS Data

Digitization has been added.

Chapter 9 Stormwater Design and Water Quality Requirements

Chapter 9 – Stormwater Design and Water Quality Requirements was not officially part of the 2020-2021

review cycle. It has been updated to incorporate the existing IDM supplements.

Chapter 11 Geotechnical and Environmental Requirements

Chapter 11 – Geotechnical and Environmental Requirements is now organized into sections for easier

navigation and referencing. A new section was added with requirements for the project’s engineer of

record. New geotechnical drawing requirements have been included. Geotechnical Baseline Report

(GBR) has been added as a conditional geotechnical requirement on tunneling and micro-tunneling

projects. GIS requirements for the chapter have been updated and now include reference to Chapter 13

GIS Data Digitization. Requirements for boring spacing and depth, Environmental Site Assessment (ESA

I/ESA II), Geotechnical Fault Study, Potentially Petroleum Contaminated Area (PPCA) investigation, and

bore hole termination requirements have been updated.

Chapter 13 GIS Data Digitization Standards

Chapter 13 – GIS Data Digitization Standards was not officially part of the 2020-2021 review cycle. A

new section was added on geotechnical and environmental GIS digital submission requirements. This

new section was added due to review and modifications to chapter 11.

Chapter 14 Facility Design Requirements

Chapter 14 – Groundwater Plant Design Guidelines has been formatted. Chapters are now designated

as Sections. Reference to Hydraulic Institute (HI) Standards have been added to Section 3 and 4.

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EXECUTIVE SUMMARY


Chapter 17 Bicycle, Transit and Pedestrian Design Requirements

Chapter 17 – Bicycle, Transit and Pedestrian Design Requirements was not officially part of the 2020-

2021 review cycle. This chapter was updated to conform to City Code of Ordinances published in 2020.

IDM Supplements

The City creates supplements for the IDM when there is a need to revise a current IDM chapter that is

outside of its normal review cycle period. At the time when a new IDM is to be released, any active

supplements are incorporated into the new IDM and those supplements subsequentially deactivated.

Prior to the completion of the 2020-2021 review cycle, there were four active IDM supplements (chapter

9.2.01, chapter 9.2.01H and the Frequently Asked Questions, and chapter 17.06). Those IDM

supplements have now been officially incorporated into the IDM for the 2021 release.

Infrastructure Design Manual Implementation

• Capital Improvement Projects A 90-day design grace period will be given for Houston Public Works capital improvement projects

managed by the Capital Projects service line. Phase II final designs that have not been submitted

for a required review prior to October 1, 2021, will be required to completely comply with the new

Infrastructure Design Manual.

• Private Sector A 90-day design grace period will be given for projects in the public/private sector. Plans submitted

for initial review after October 01, 2021 will be required to comply with the new Infrastructure

Design Manual.

• IDM Supplements for Private and Capital Improvement Projects IDM supplements were effective upon signature. There is no design grace period for Chapter 9

of the IDM. Therefore, Chapter 9 updates were effective April 01, 2021.

CONSTRUCTION SPECIFICATIONS

Revised Specifications

Various specifications, that are associated with the IDM chapters reviewed during the 2020-2021 review

cycle, were reviewed and updated. A total of 17 specifications were revised and 3 new specifications

were created, and one specification was retired. 02082 “Precast Concrete Manholes” was updated in

coordination with the creation of new standard details for precast concrete manhole. The three new

specifications created are 02614 “Large Diameter Line Stop”, 02615 “Insertion Valves and Line Stop”,

and 16124 Trace Wire for Water Lines”. The 16717 “Programmable Vehicle Signal Head” standard

specification was retired since it is not in use by the City. A list of all specifications created or updated is

provided at the end of this executive summary.

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EXECUTIVE SUMMARY


Specification Implementation

Capital Improvement Projects Per Document 00700 General Condition, section 1.2.4:

“Reference to standard specifications, manuals, or codes of a technical society, organization, or association, or to laws or regulations of a governmental authority, whether specific or implied, mean the latest edition in effect as of date of receipts of bids, except as may be otherwise specifically stated in the Contract.”

Private Sector All projects in the public/private sector submitted after October 01, 2021 shall comply with the latest version of the City’s Construction Specifications.

STANDARD DETAIL REVISIONS Revised Standard Details

Various standard details associated with IDM chapter 8 and chapter 7 were up for review during the 2020-2021 review cycle. A total of eleven standard details were revised and three new standard details were created. The three new standard details are for trace wire on non-metallic pipes on water lines. The trace wire standard details were created to go along with the new specification created this review cycle. A list of all standard details created or updated is provided at the end of this executive summary.

Two new stormwater details were created. 02082-12 and 02082-13 are new standard details for precast concrete manholes. They have been created in coordination with city, state, and national subject matter experts. These details were created along with the updates to the precast concrete manhole standard specification. Storm Sewer standard details 02081-01 through 02081-04, that detail brick manhole construction, are retired because of the new precast manhole standard details.

Revised Standard Detail Implementation

A 90-day design grace period will be given for implementation of the standard details. Changes shall be effective October 1, 2021.

For Houston Public Works capital improvement projects managed by the Capital Projects service line, Phase II final designs that have already been submitted for a required review prior to October 1, 2021, it is recommended that all designers make an effort to incorporate the new changes into their current design to the extent that it does not increase cost or delay a project.

END OF EXECUTIVE SUMMARY

(See Next Page for List of New Revisions)

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EXECUTIVE SUMMARY


NEW IN THE 2021 REVISION

Infrastructure Design Manual (IDM), Standard Construction Specifications and Standard Details for Houston Public Works Design & Construction — 2021 Revision

Infrastructure Design Manual (IDM) Chapters Updated:

IDM Ch. 3 – Graphic Requirements IDM Ch. 6 – Utility Locations IDM Ch. 7 – Waterline Design Requirements IDM Ch. 8 – Wastewater Collection System

Design Requirements IDM Ch. 9 – Stormwater Design and Water

Quality Requirements IDM Ch. 11 – Geotechnical and Environmental

Requirements IDM Ch. 13 – GIS Data Digitization IDM Ch. 14 – Facility Design Requirements

Groundwater Plant Design Guidelines IDM Ch. 17 – Bicycle, Transit and Pedestrian

Design Requirements

New Standard Specifications:

02614 – Large Diameter Line Stop 02615 – Insertion Valves and Line Stops 16124 – Conductive Trace Wire for Non-Metallic

Water Line Pipes

Standard Specifications Updated:

02082 – Precast Concrete Manholes 02400 – Tunnel Shafts 02431 – Tunnel Grout 02501 – Ductile Iron Pipe and Fittings 02506 – Polyvinyl Chloride Pipe 02507 – Prestressed Concrete Cylinder Pipe 02511 – Water Lines 02512 – Water Tap and Service Line Installation 02513 – Wet Connections 02514 – Disinfection of Water Lines 02517 – Water Line in Tunnels 02518 – Steel Pipe and Fittings for Large

Diameter Water Lines 02520 – Fire Hydrants 02524 – Air Release and Vacuum Relief Valves 02527 – Polyurethane Coatings on Steel or

Ductile Iron Pipe 02528 – Polyethylene Encasement/Wrap 02613 – Bar-Wrapped Steel Cylinder Pipe

Standard Specifications Retired/Deleted:

16717 – Programmable Vehicle Signal Head

New Standard Details:

02082-12 – Storm Sewer Type ‘C’ Precast Round Manhole (Storm Sewer)

02082-13 – Storm Sewer Precast Box Manhole (Storm Sewer)

16124-01 – Complete Utility Locating System Sample Plan (Water)

16124-02 – Complete Utility Locating System Water Service Detail (Water)

16124-03 – Complete Utility Locating System Hydrant Detail (Water)

Standard Details Updated:

02091-01 – Non-Metallic Frame and Cover (Wastewater)

02082-06 – Sanitary Sewer Manhole Vent for Sealed Manhole (Wastewater)

02082-10 – Standard LDWL Access Manhole Details (Water)

02317-09 – Standard LDWL Excavation and Backfill Detail (Water)

02517-01 – LDWL Tunnel and Casing Details for Water Lines 24-Inch and Larger (Water)

02520-01 – Standard Fire Hydrant Detail (Water) 02524-03 – LDWL Air Valve Assembly in Service

Manhole Detail (Water) 15641-01 – Standard LDWL Cathodic Protection

Details for Test Stations (Sheet 1 of 3) (Water) 15641-02 – Standard LDWL Cathodic Protection



Details for Test Stations & Anodes (Water)

Standard Details Retired/Deleted:

02081-01 - Storm Sewer Manhole Type "C" for 42" Diameter RCP and Smaller

02081-02 - Storm Sewer Manhole Type "C" for 48" to 72" Diameter RCP

02081-03 - Storm Sewer Manhole Type "C" for 78" Diameter RCP and Greater

02081-04 - Storm Sewer Manhole Type "C" for Proposed Concrete Box Sewer

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