2012 Stormwater Management Manual for Western Washington (SWMMWW)

New item The 2014 Permit and Stormwater Manual Modification public comment period has CLOSED. Ecology is reviewing comments; see the modification page for the estimated completion date.


 

 

 

The 2012 Western Washington manual consists of five volumes. You can download the manual in its entirety or volume by volume, through the link below.

 

 

 2012 Stormwater Management Manual for Western Washington(SWMMWW) and Errata

Additional Resources

Low Impact Development (LID) Resources

Response to Comments on the Draft 2012 SWMMWW

Western Washington Continuous Simulation Hydrology Model (WWHM)

2005 Stormwater Management Manual for Western Washington

2001 Stormwater Management Manual for Western Washington

How to Get Copies of the 2012 Stormwater Manual

You may order a printed copy or the SWMMWW on CD (for a nominal cost) at the following Internet address:

https://prtonline.myprintdesk.net/DSF/storefront.aspx?6xni2of2cF1OAY5jHVvlUrUsqozrCjF3xgL/DdBBf+Sre9e470j4aMR+LcLIWmKS

If you have questions about ordering the 2012 Stormwater Manual, please call the Department of Printing at (360) 570-5555.

Additional Information

To help readers understand the guidance in the 2012 SWMMWW, Ecology has created several additional handouts:

How and when will this affect me?

The Stormwater Management Manual for Western Washington is a guidance document. By itself it is not a legally enforceable document. However, several of the NPDES Stormwater General Permits do require the use of the Manual. The changes to the SWMMWW apply to western Washington NPDES permittees listed in the table below. The table also shows when Ecology expects these changes to take effect for each permit.

Western Washington permittees covered under the following permits will be affected:

When the 2012 SWMMWW takes effect for each permit:

Municipal Stormwater Permits According to proposed implementation schedules of each permit.

Industrial Stormwater General Permit (ISGP)

Possibly, upon reissuance of the ISGP (current permit expires January 1, 2015).
Construction Stormwater General Permit (CSWGP) Possibly, upon reissuance of the CSWGP (current permit expires December 31, 2015).
Sand and Gravel General Permit Possibly, upon reissuance of the Sand and Gravel General Permit (current permit expires October 1, 2015).
Boatyard General Permit Possibly, upon reissuance of the Boatyard General Permit (current permit expires May 31, 2016).

Western Washington municipalities not covered under a general stormwater permit often use the SWMMWW. Check with your city or county to find out if they use the SWMMWW and for adoption dates.

What are the major changes?

Key changes in the final 2012 SWMMWW include:

Redlined 2012 SWMMWW

The following files show the changes between the 2005 SWMMWW and the final 2012 SWMMWW.

Comparison between 2012 SWMMWW and 2005 SWMMWW

Volume I
Volume II
Volume III
Volume IV
Volume V

Public Comment Period Closed

On November 4, 2011, Ecology began a 90-day public comment period for the Draft 2012 Stormwater Management Manual for Western Washington (SWMMWW). For more information, to view the public comments that Ecology received on the Draft 2012 SWMMWW, and to see Ecology’s Response to Comments on the Draft 2012 SWMMWW  please visit the draft stormwater management manual webpage. Ecology used the public comments and suggestions to improve the manual and to issue the final 2012 Stormwater Management Manual for Western Washington.

What if I have questions?

Check out our Ecology Contacts for Technical Questions webpage. You may be interested in participating in our upcoming (February through June, 2013) trainings.  Details about the upcoming trainings will be posted on http://www.ecy.wa.gov/programs/wq/stormwater/municipal/EcyWorkshops.html.

You can also contact the SWMMWW coordinator, Amanda Heye, directly at 360-407-6457.