CoSMoS (Coastal Storm Modeling System) modeled flood hazards for Pierce County, Washington

This data release consists of flood hazard maps from compound coastal hazards--specifically sea-level rise (SLR), projected coastal storms, and streamflow. Products include projected flood depths, flood extents including uncertainties, water elevations, velocity hazards, and flood duration. These are generated using a suite of numerical models driven by outputs from Global Climate Models (GCMs) included in the Coupled Model Intercomparison Project Phase 6 (CMIP6; Haarsma and others, 2016). The resulting data include gridded maps and shapefiles that reflect projected coastal hazards due to sea level rise (SLR) and plausible future storm scenarios. These scenarios account for changes in storm behavior and natural variability. Flood simulations incorporate dynamic contributions from tides, storm surge, waves, seasonal sea-level fluctuations, and streamflow--providing a comprehensive view of potential future flooding. Outputs cover seven SLR scenarios (0, 0.25, 0.5, 1.0, 1.5, 2.0, and 3.0 meters) combined with five storm return periods (1-year, 10-year, 20-year, 50-year, and 100-year events), along with a background condition representing no storm (only astronomical tides). Additionally, this data release includes the developed overland flood model (Super-Fast INundation of CoastS, SFINCS) used for Pierce County, Washington. Information about the project and links to data for other counties can be found here: https://cmgds.marine.usgs.gov/data-releases/community/Cosmos_SalishSea/