City of Seattle

Stormwater Manual

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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 Tacoma, City of Vancouver, King County, Spokane County / City of Spokane / City of Spokane Valley, Washington, Washington State Department of Transportation (WSDOT)

Document Metadata

Jurisdiction level

City

“City of Seattle”
Page 2 of 1086

State

Washington

“Washington State Department of Ecology”
Volume 1, Chapter 1, Page 1-1

Version / edition

Not found in document

No evidence cited

Adoption / effective date

Not found in document

No evidence cited

Last revised date

Not found in document

No evidence cited

Relationship to state manual

deemed equivalent to state manual

“Ecology has determined to meet the requirements contained in the Phase I NPDES Municipal Stormwater Permit, with reference to the Stormwater Management Manual for Western Washington (Ecology 2019).”
Volume 1, Chapter 1, Page 1-1

Design Criteria

Design storm return periods (years)

2-year, 5-year, 10-year, 25-year, 50-year, 100-year

“2-year, 5-year, 10-year, 25-year, 50-year, 100-year”
Volume 1 & Volume 3

Water quality volume method

The daily runoff volume at or below which 91 percent of the total runoff volume for the simulation period occurs, as determined using an approved continuous model.

“The daily runoff volume at or below which 91 percent of the total runoff volume for the simulation period occurs, as determined using an approved continuous model.”
Volume 1, Chapter 5, Page 5-14

Peak flow calculation method(s)

Continuous Simulation Method, Single Event Hydrograph Method, Rational Method

“Single Event Hydrograph Method... Continuous Simulation Method... Rational Method”
Volume 3, Chapter 4, Page 4-46 & Page 4-65

Hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

On-site stormwater management, Flow control, Water quality treatment, Conveyance, Soil amendment, Tree planting and retention, Dispersion, Infiltration, Rainwater harvesting, Alternative surface, Detention, Non-infiltrating

“This volume covers four primary functional categories of stormwater BMPs: On-site stormwater management, Flow control BMPs, Water quality treatment BMPs, Conveyance BMPs”
Volume 3, Chapter 2, Page 2-1