King County Flood District commits to improving landslide mapping preparation | King County

In the wake of the Oso landslide, the King County Flood Control District Executive Committee wants to use advances in technology to dramatically improve the collection and use of landslide data.

The Executive Committee will send to the full Board of Supervisors a resolution calling for an update to King County’s river basin landslide hazard mapping. By mapping landslide hazards in light of flood and channel migration hazards, the Flood Control District will be better prepared to act to reduce risks to people, property, and critical infrastructure.

“This project is a prudent and timely update of potential landslide locations along King County rivers,” said Flood Control District Chair Reagan Dunn, “Recently there was a landslide on the Cedar River in my district, thankfully the impacts to residents were minimal, but it illustrates the need to have updated information so the Flood District can be in a better position to protect people, property and critical public infrastructure.”

The District will provide approximately $200,000 in 2014 for these updates, with additional funds coming through 2016.

The work in 2014 includes landslide hazard characterization along major rivers and significant tributaries, as well as listing high-risk sites where landslide and floodplain hazards intersect.

Preliminary maps along major rivers and significant tributaries will be available by October 2014, and potential high-risk sites will be identified by December of 2014.

Further mapping improvements will follow through July 2016, including identification of different landslide hazard types, public safety consequences, historically active sites, landslide run-out zones, areas of moderate and severe channel migration, and areas at risk for debris dam formation that could lead to upstream flooding.

The King County Flood Control District will fund more than $1.4 million for the two-year project. The King County Water and Land Resources Division will conduct the mapping study, under agreement with the District. The resolution was adopted by the Flood Control District Executive Committee at its May 19 meeting and is awaiting final action by the full Flood Control District Board of Supervisors.


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