King County
Surface Water Design Manual
CountyWashingtonhighNeeds reviewCitations verified
This extraction is flagged for quality review.
Compare each cited field to the official PDF before relying on it. What this means
King County SWDM 2021/2024; text extract truncated but core requirements and WQ/flow-control structure clear. Pipeline excerpt repair removed 2 unlocated citation(s).
Fields not found in document: document_metadata.jurisdiction_level, document_metadata.state_code
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, Spokane County / City of Spokane / City of Spokane Valley, Washington, Washington State Department of Transportation (WSDOT)
Document Metadata
Jurisdiction level
Not found in document
No evidence cited
State
Not found in document
No evidence cited
Version / edition
2021 Amended November 14, 2024
“July 23, 2021 Amended November 14, 2024”
Title
Adoption / effective date
2021-07-23
“July 23, 2021”
Title
Last revised date
2024-11-14
“Amended November 14, 2024”
Title
Relationship to state manual
independent
“King County Code (KCC) Chapter 9.04”
Chapter 1
Design Criteria
Design storm return periods (years)
2-year, 10-year, 25-year, 100-year
“Flow Control / design standards”
Chapter 3
Water quality volume method
Core Requirement #8: Water Quality. Water quality menus (Basic Water Quality Menu and others) in Chapter 6. Continuous simulation / WWHM-based sizing typical for flow control and WQ facilities.
“Core Reqmt #8: Water Quality”
Section 1.2.8
Peak flow calculation method(s)
Core Requirement #3: Flow Control, Flow Control Design standards (Chapter 3), Flow control design using continuous hydrologic modeling (WWHM), Core Requirement #9: Flow Control BMPs (dispersal/infiltration LID BMPs)
“Core Reqmt #3: Flow Control”
Section 1.2.3
Hydrologic/hydraulic software
Western Washington Hydrology Model (WWHM) / continuous simulation tools as specified
“Flow Control Design Using the”
Section 3.3.2
Approved BMP categories
Flow control facilities, Water quality treatment facilities (Basic WQ menu and others), Flow control BMPs / LID, Infiltration facilities
“Basic Water Quality Menu”
Section 6.1.1