Pewaukee River flood Study


The Village of Sussex hired Stormwater Solutions Engineering to review updated survey data along the Pewaukee River between Clover Drive and Lisbon Road to determine their effects on the 100-year floodplain. SSE used existing high water levels and updated topography to calibrate hydrologic and hydraulic models to accurately reflect flood events along the river reach. Data from the updated flood model was used to redraw the floodway, 100-year, and 500-year flood boundaries, resulting in a significant reduction in flood map footprint. SSE coordinated with the Village of Sussex, Waukesha County, WI Department of Natural Resources, and property owners to assemble and submit a LOMR application to FEMA. Th updated flood map was accepted by FEMA in February 2017.