Stormwater manuals

Between versions: What changed and why?

Other manuals for management and design

• LID Technical Guidance Manual for Puget Sound
• LID Technical Guidance Manual for Eastern Washington
• Rain Garden Handbook for Western Washington
• Airport Stormwater Design Manual
• Guidance for UIC Wells that Manage Stormwater

Manual equivalency

In some cases, municipal stormwater permittees have the option of either adopting portions of the appropriate Stormwater Manual or portions of a regional manual determined to be equivalent to the Ecology manual.

Other resources

• We provide the Western Washington Hydrology Model (WWHM) to support designers to model BMPs.
• Learn how the SWMMWW and Municipal Stormwater Permits cross-reference.
• Read Ecology's 2013 Focus Sheet on Bioretention Soil Media
• Looking for your general stormwater permit page?
• For more information and resources, please see our stormwater guidance pages.