Washington State Department of Ecology

Stormwater Management and Design Manuals

On November 4, 2011, Ecology began a 90-day comment period on a draft of selected edits to the Stormwater Management Manual for Western Washington. More information can be found on the 2012 Draft Stormwater Management Manual for Western Washington webpage.

Stormwater Management Manual for Western Washington (Ecology Publication)
Stormwater Management Manual for Eastern Washington (Ecology Publication)
- Corrections - Chapter 2 - Core Elements for New Development and Redevelopment
- Corrections - Chapter 4 - Hydrologic Analysis - Isopluvial maps with Township and Range
  - Color maps
  - Black & white maps
- Corrections - Chapter 5 - Runoff Treatment Facility Design
- Corrections - Replace Chapter 5.6 with Ecology Publication #05-10-067, Guidance for UIC Wells that Manage Stormwater
- Corrections – Chapter 6 – The evaporation calculation spreadsheet referenced in Section 6.4.3
  - Sample Calculation spreadsheet
- Corrections - Chapter 7 - Construction Stormwater Pollution Prevention
Ecology Approved Functionally Equivalent BMPs
Phase I Equivalent Stormwater Manuals for Western Washington
Phase II Eastern Washington Equivalent Stormwater Manuals
WSDOT Highway Runoff Manual
Puget Sound Partnership Low Impact Development Manual
Guidance for Evaluating Emerging Stormwater Treatment Technologies, Technology Assessment Protocol - Ecology (TAPE)
Guidance for Evaluating Emerging Stormwater Treatment Technologies at Construction Sites -- Chemical Technology Assessment Protocol - Ecology (CTAPE)
Stormwater Technical Resources

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