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2013 King County Flood Hazard Management Plan Update

About the Flood Plan

  • The 2006 King County Flood Hazard Management Plan recommends contemporary strategies to reduce flood risks to tens of thousands of people, billions of dollars in economic infrastructure and major transportation corridors.
  • King County is required to update its Flood Plan every five years. 
  • Updating the plan ensures King County continues to receive its high rating for floodplain management by the National Flood Insurance Program – which results in a 40 percent discount in flood insurance premiums for unincorporated King County residents.
  • Link to goals and objectives of the 2006 Flood Plan.

Click to enlarge diagram.

Thumbnail diagram of how the King County Flood Hazard Management Plan is integrated through other planning documents.

Initial scope of work for the Flood Plan update

The King County Flood Control District Board of Supervisors (external) approved Motion FCD11-03.1 that establishes the following scope of work for the update to the Flood Plan:

  1. Update flood and channel migration hazard information.
  2. Update risk and vulnerability assessments, including economic impacts.
  3. Update the strategy and action plan for each basin.
  4. Prepare issue papers and decision documents to facilitate potential policy development and updates by the Flood District on the following topics:
    • Risk reduction standards, appropriate levels of flood protection for each river system, and integrated basin-wide action plans;
    • Levee certification and accreditation;
    • Levee vegetation and PL 84-99 participation;
    • Coastal, small streams, and urban flooding;
    • Social justice and outreach to vulnerable populations in high risk flood zones;
    • Property acquisition and relocation approaches for residential and business properties;
    • Capital project prioritization, sequencing approach, criteria, and scoring;
    • Bioengineering; and
    • Gravel removal and sediment management.

Revised scope of work for the Flood Plan update - June 2013

Three public meetings were held in December 2012 to gather feedback on the Flood Plan update. As a result of input received, the update will proceed on two paths with these goals in mind:

  1. Maintain King County’s high federal rating for flood preparedness, which results in discounts of up to 40 percent for flood insurance policy holders; and
  2. Move forward with a separate and more detailed analysis and improved stakeholder process to identify clear floodplain management goals and alternatives for attaining those goals.

A Flood Plan update is required every five years to maintain King County’s high federal rating for flood preparedness.

The 2013 Flood Plan update will maintain King County’s rating and insurance discounts. It will provide a progress report and be adopted as an amendment to the 2006 Flood Plan, and update technical information that has emerged since 2006, including updated hazard and risk assessments. The 2013 Flood Plan update does not contain any new policies and will be adopted by both the King County Flood Control District (external link) and the King County Council.

King County is moving forward with a separate and more detailed analysis and improved stakeholder process to identify clear floodplain management goals and alternatives for attaining those goals. River corridor plans will be completed over the next two years and adopted as amendments to the 2006 Flood Plan.

King County will complete a comprehensive revision to the 2006 Flood Plan in 2018, integrating the corridor management plans into a Countywide plan for public review.

Schedule: Updated June 13, 2013

  • September 2011 - Establish citizens committee.
  • December 2011 - Begin citizens committee meetings.
  • June 2012 - Revise risk assessment.
  • August 2012 - Revise action plan.
  • September 2012 - Prepare internal and citizens committee draft plan.
  • Dec. 2012 - Public meetings to present proposed flood risk reduction strategies for each river basin.
  • June 14-July 12, 2013 - Proposed public and environmental review period for the Draft Flood Plan.
  • July 9, 2013 - Public meeting on draft plan and environmental review.
  • July 19, 2013 - Provide responses to public comments.
  • August 2013- Transmit proposed Flood Plan to the King County Flood Control District Board of Supervisors and the King County Council.
  • October 2013 - Request adoption by the King County Flood Control District Board of Supervisors and the King County Council.
For questions about the King County Flood Hazard Management Plan Update, please email wlr-rivers@kingcounty.gov.