Committee on Design

AASHTO Liaison
Patricia Bush, Program Manager for Engineering

Technical Committee on Hydrology and Hydraulics

Membership List

Objective and Scope

The objective of this technical committee is to provide a focal point and working group with expertise in hydrology and hydraulics to develop AASHTO guidelines and policies for drainage design of transportation facilities.

Publication Responsibility

AASHTO Drainage Manual, 1st Edition (CD-ROM) 

AASHTO released the AASHTO Drainage Manual, 1st Edition, which replaces the AASHTO Model Drainage Manual, published in 2005.

The technical committee is responsible for updating the Highway Drainage Guidelines, 4th Edition. 

For more information about either of these publications, or to purchase a copy, visit the AASHTBookstore at


Issue 18 – Fall 2019

Issue 17 – Winter 2019

Issue 16 – Winter 2018

Issue 15 – Summer 2017

Issue 14 – Winter 2016

Issue 13 – Summer 2016

Issue 12 – Winter 2015

Issue 11 – Summer 2015

Issue 10 – Winter 2014

Issue 9 – Winter 2013

TCHH Operating Guidelines – adopted 9/17/2013

Reports of Interest

“Research and Applications Needs in Flood Hydrology Science”
The summary report is free and available at:

Project 20-07 Task 264, Guidance for the Design and Selection of Pipes

Meeting Minutes

The following are the official minutes from recent technical committee meetings:

TCHH Membership

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For questions or comments relating to this committee, please contact Patricia Bush

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