Highway Runoff Manual

The Highway Runoff Manual (HRM) provides guidance to direct the planning and design of stormwater management facilities for existing and new Washington State highways, rest areas, park-and-ride lots, ferry terminals, and highway maintenance facilities throughout the state. The HRM establishes minimum requirements and provides uniform technical guidance. 

Publication Date: 
Tuesday, May 16, 2006
Publication Number: 
M 31-16
Last modified: 
04/05/2019 - 14:35
Publication Version: 
M 31-16.05
Manual Manager: 
Alex Nguyen
Originator: 
WSDOT HQ Design Office, Highway Runoff Unit
Subject: 
Planning and design of stormwater management.

2019 Highway Runoff Manual Individual Chapters

Clean Version

Chapter 1 Introduction to the HRM (pdf 209 kb)

Chapter 2 Stormwater Planning and Design Integration (pdf 213 kb)

Chapter 3 Minimum Requirements (pdf 483 kb)

Chapter 4 Hydrological Analysis (pdf 529 kb)

Chapter 5 Stormwater Best Management Practices (pdf 13.1 mb)

Chapter 6 Temporary Erosion and Sediment Control (pdf 123 kb)

Appendix 2-A Engineering and Economic Feasibility Evaluation for Meeting the Highway Runoff Manual Minimum Requirements  (pdf 213 kb)

Appendix 4-A Web Links (pdf 137 kb)

Appendix 4-B TR-55 Curve Number Tables (pdf 222 kb)

Appendix 4-C Eastern Washington Design Storm Events Blank (pdf 37 kb)

Appendix 4-D Infiltration Testing and Design (pdf 1.6 mb)

Glossary (pdf 392 kb)

 

Highway Runoff Manual Revision History

Date

Version

Complete Manual

Revision

2016 February

Supplement

PDF (19 MB)

PDF (2.5 MB)

2014 April

M 31-16.04

PDF (29 MB)

PDF (29 MB)

2011 November

M 31-16.03

PDF (6.4 MB)

PDF (0.4 MB)

2010 May

M 31-16.02

PDF (6.4 MB)

PDF (0.4 MB)

2008 June

   

PDF (0.4 MB)

2007 March

M 31-16.01

PDF (6.1 MB)

PDF (0.5 MB)

2006 October

 

 

PDF (0.6 MB)

2006 May

 

 

PDF (0.6 MB)

2004 March

 

PDF (16.1 MB)

PDF (16.9 MB)

1995 February

 

PDF (0.7 MB)