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The Snohomish County Department of Public Works, Surface Water Management Division tasked WSE with characterizing current floodplain hydraulic conditions in the Snohomish River watershed and assessing projected impacts of climate change on flood depths and inundation extents along reaches of the Skykomish, Snoqualmie, and Snohomish rivers. The study area included the Skykomish River as far upstream as Gold Bar, the Snoqualmie River as far upstream as the King-Snohomish County Line, and the entire length of the Snohomish River from Monroe to Possession Sound. |
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The Snohomish County Department of Public Works, Surface Water Management Division tasked WSE with characterizing current floodplain hydraulic conditions in the Snohomish River watershed and assessing projected impacts of climate change on flood depths and inundation extents along reaches of the Skykomish, Snoqualmie, and Snohomish rivers. The study area included the Skykomish River as far upstream as Gold Bar, the Snoqualmie River as far upstream as the King-Snohomish County Line, and the entire length of the Snohomish River from Monroe to Possession Sound. |
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Watershed Science and Engineering |
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A 2D HEC-RAS hydraulic model was developed, calibrated, and applied to evaluate river-related flooding through the Snohomish River watershed. Floodplain conditions were characterized within the study area for historical, mid-century (2040-2069), and late-century (2070-2099) time periods. For each time period, The calibrated model was run to produce flood depths, velocities, water surface elevations, and inundation extents, for the 2-, 5-, 10-, 25-, 50-, 100-, and 500-year flood events. For more information visit: <a href="https://snohomishcountywa.gov/DocumentCenter/View/81632/Hydraulic-and-Hydrologic-Modeling-Report---Snohomish">https://snohomishcountywa.gov/DocumentCenter/View/81632/Hydraulic-and-Hydrologic-Modeling-Report---Snohomish</a> |
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All maps, data, and information set forth herein (“Data”), are for illustrative purposes only and are not to be considered an official citation to, or representation of, the Snohomish County Code. Amendments and updates to the Data, together with other applicable County Code provisions, may apply which are not depicted herein. Snohomish County makes no representation or warranty concerning the content, accuracy, currency, completeness or quality of the Data contained herein and expressly disclaims any warranty of merchantability or fitness for any particular purpose. All persons accessing or otherwise using this Data assume all responsibility for use thereof and agree to hold Snohomish County harmless from and against any damages, loss, claim or liability arising out of any error, defect or omission contained within said Data. Washington State Law, Ch. 42.56 RCW, prohibits state and local agencies from providing access to lists of individuals intended for use for commercial purposes and, thus, no commercial use may be made of any Data comprising lists of individuals contained herein |
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Hydraulic and Hydrological Modeling in the Snohomish Watershed: MidCentury 50yr-Depth (Max).SnohomishBasin_TopographicSurface_2020.04.08 |
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["Snohomish River","Flood","Modeling","Hydraulics"] |
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en-US |
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