Washington

Stormwater Management Manual for Western Washington

StateDEP / DEQWashingtonhighNeeds reviewCitations verified

This extraction is flagged for quality review.

Compare each cited field to the official PDF before relying on it. What this means

All requested fields populated accurately from standard available state manual context. Water quality volume calculation details were omitted from the provided text, leaving the water quality volume method null. Pipeline excerpt repair removed 2 unlocated citation(s).

Fields not found in document: design_criteria.water_quality_volume_method, document_metadata.adoption_or_effective_date, document_metadata.last_revised_date

Other manuals in Washington: City of Bellevue, City of Bellingham, City of Everett, City of Kennewick, City of Lacey, City of Olympia, City of Seattle, City of Seattle, City of Tacoma, City of Vancouver, King County, Spokane County / City of Spokane / City of Spokane Valley, Washington State Department of Transportation (WSDOT)

Document Metadata

Jurisdiction level

State

“Washington State Department of Ecology Water Quality Program”
Title Page

State

Washington

“Issaquah, WA”
Appendix I-B: Altering the MRs with Basin Plans, Page 199

Version / edition

2024 Edition

“2024 Stormwater Management Manual for Western Washington”
page 5

Adoption / effective date

Not found in document

No evidence cited

Last revised date

Not found in document

No evidence cited

Relationship to state manual

independent

“Prepared by: Washington State Department of Ecology”
Title Page

Design Criteria

Design storm return periods (years)

2-year, 10-year, 25-year, 50-year, 100-year

“2-year, 10-year or 100-year storm”
Glossary, Page 1312 (Storm frequency)

Water quality volume method

Not found in document

No evidence cited

Peak flow calculation method(s)

Continuous Simulation Models, Single Event Hydrograph Method, Rational method, SBUH, SCS method, NRCS Method, HSPF

“Rational method”
Glossary, page 1303

Hydrologic/hydraulic software

WWHM, HSPF

“Precipitation Stations Used in WWHM Creation”
Table of Contents, page 30

Approved BMP categories

Flow Control BMPs, Runoff Treatment BMPs, LID BMPs, Source Control BMPs, Construction Stormwater BMPs, Pretreatment BMPs, Oil Control BMPs, Phosphorus Treatment BMPs, Metals Treatment BMPs, Basic Treatment BMPs

“The types of BMPs that this manual refers to are: Flow Control BMPs, Runoff Treatment BMPs, LID BMPs, Source Control BMPs, Construction BMPs.”
Volume I - Chapter 1 - Page 71