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, April 30, 2019
Publication Number: 
M 31-16
Last modified: 
05/22/2019 - 15:32
Publication Version: 
M 31-16.05
Manual Manager: 
Alex Nguyen
Originator: 
WSDOT HQ Design Office, Highway Runoff Unit
Number of Pages: 
569
Subject: 
Planning and design of stormwater management.

Highway Runoff Manual Revision History

Date

Version

Complete Manual

Revision

2019 April

M 31-16.05

PDF (17.6 MB)

PDF (17.6 MB)

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)