Floods
Floods
In addition to the flood warning information that is provided by real-time USGS streamgages across the state, we conduct monitoring and research that allows us to improve our understanding and prediction of the magnitude and frequency of floods in Wasington. This may include locating and measuring high-water marks and related post-flood data soon after particularly large flood events, or developing computer models to simulate possible floods under changing land use or climate conditions.
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Probability Flows for Streams in Eastern WA
Under Washington regulations, bridges, culverts, and other stream-crossing structures need to be designed with fish passage in mind. For culverts, maximum flows cannot exceed a 10-percent exceedance probability flow (the flow that is equalled or exceeded 10 percent of the time) when fish are migrating upstream. To help the Washington Department of Natural Resources manage its culverts at more than...