City of Vancouver

Surface Water Management Design and Construction Requirements (Section 4 General Requirements)

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

Local Section 4 (2025) + SWMMWW adoption via VMC 14.25. Return periods mirrored from wa-state-western / SWMMWW.

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, 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 Vancouver”
Coverage

State

Washington

“Washington State Department of Ecology”
§4-1

Version / edition

FINAL 2/18/2025

“FINAL 2/18/2025”
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Adoption / effective date

2025-02-18

“FINAL 2/18/2025”
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Last revised date

2025-02-18

“FINAL 2/18/2025”
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Relationship to state manual

adopts state manual directly

“supplement and clarify the Stormwater Management Manual for Western Washington (Stormwater Manual)”
§4-1

Design Criteria

Design storm return periods (years)

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

“SWMMWW design storms 2/10/25/50/100”
SWMMWW / coverage note

Water quality volume method

Adopts Ecology Stormwater Management Manual for Western Washington (SWMMWW) Minimum Requirements by reference (MR #1–#9 including runoff treatment and flow control). Local Section 4 General Requirements supplement/clarify SWMMWW for Vancouver conditions, including bioretention, flow control & infiltration systems, and UIC program alignment.

“Minimum Requirements ... Flow Control ... Ecology's Stormwater Manual”
§4-1.01

Peak flow calculation method(s)

Ecology SWMMWW continuous simulation / flow control, WWHM / HSPF (per SWMMWW), City General Requirements Section 4

“Flow Control & Infiltration Systems”
§4-5

Hydrologic/hydraulic software

WWHM, HSPF

“Manual for Western Washington (SWMMWW). 2. Minimum Requirement #2: Construction Stormwater Pollution Prevention Plan (SWPPP) – Discuss whether a SWPPP will be required for the project (full or abbreviated) due to the thresholds for hard surfaces and disturbed area. Submi”
p. 10

Approved BMP categories

Bioretention areas, Flow control facilities, Infiltration systems, Runoff treatment BMPs (SWMMWW), LID BMPs, Source control BMPs, Construction stormwater BMPs

“Bioretention Areas”
§4-7.01