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2020 Infrastructure Design Manual

The 2020 version of the Infrastructure Design Manual (IDM)


Last updated: September 10, 2020

2019 Infrastructure Design Manual

The 2019 version of the Infrastructure Design Manual (IDM)

Groundwater Plant Design Guidelines

Groundwater Plant Design Guidelines January 2011

IDM Chapter 9.2.01 Supplement

Chapter 9.2.01 supplement for design rainfall events, pipe sizes and placement, and inlet

Harris County Records Memo

Memo for restrict flood bond projects to municipalities.

IDM Chapter 9 storm detention cover letter

Cover letter explaining the supplemental changes made to Chapter 9 of the Infrastructure Design Manual.


Last updated: January 26, 2021