Spokane County / City of Spokane / City of Spokane Valley

Spokane Regional Stormwater Manual

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

Regional 2008 SRSM still widely cited; confirm local adoption of Ecology SWMMEW updates. Pipeline excerpt repair removed 3 unlocated citation(s).

Fields not found in document: design_criteria.required_hydrologic_hydraulic_software, document_metadata.version_or_edition, 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, Washington, Washington State Department of Transportation (WSDOT)

Document Metadata

Jurisdiction level

Special District

“Spokane Regional Stormwater Manual”
Title

State

Washington

“Eastern Washington / SWMMEW”
Introduction

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

“meets or exceeds applicable criteria from the Washington State Department of Ecology’s Stormwater Management Manual for Eastern Washington (SWMMEW)”
Introduction

Design Criteria

Design storm return periods (years)

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

“2-year, 10-year, 25-year, 100-year, 24 hour Isopluvial Map”
Chapter 5 figures

Water quality volume method

Basic Requirement No. 3 Water Quality Treatment: size treatment BMPs for the volume (or peak) equivalent of the 6-month NRCS Type II 24-hour water quality storm; 6-month precipitation ≈ 0.69 × 2-year precipitation. Flow control (Basic Requirement No. 4) and conveyance (Basic Requirement No. 5) apply per chapters 7–8.

“treat the volume equivalent of the 6-month NRCS Type II 24-hour water quality”
Chapter 6

Peak flow calculation method(s)

NRCS Type II 24-hour storms with regional isopluvial maps (2-, 10-, 25-, 100-year), Flow control outflow structures (Chapter 7), Natural and constructed conveyance systems (Chapter 8)

“Basic Requirement No. 4 - Flow Control”
Chapter 2 / 7

Hydrologic/hydraulic software

Not found in document

No evidence cited

Approved BMP categories

Basic treatment BMPs, Metals treatment BMPs, Phosphorus treatment BMPs, Bioinfiltration / biofiltration, Oil-water separators, Flow control / detention facilities

“Basic Treatment / Metals Treatment / Phosphorus Treatment”
Chapter 6