Flood Cleanup in Washington, DC

Washington DC's flood cleanup requirements are driven by its position at the tidal head of the Potomac estuary, the compound flooding risk from two urban rivers, and the low-lying topography of neighborhoods built on reclaimed Potomac River floodplain. The West Potomac Park and the National Mall — built on fill material between the Washington Channel and the Tidal Basin — sit barely above the mean high-tide line and flood regularly during major Chesapeake Bay storm surge events that push tidal water up the Potomac. For residential neighborhoods, Rock Creek is the most frequent flood trigger: the creek, which drains 68 square miles of Montgomery County, Maryland before entering DC, can rise 15 to 20 feet at the Connecticut Avenue bridge within hours of a heavy rainfall event, sending water across Beach Drive and into the lower reaches of the Cleveland Park and Woodley Park neighborhoods. The Anacostia River, bounded by Kenilworth Aquatic Gardens and the Anacostia waterfront, regularly floods the adjacent bikeway and pathway systems and threatens industrial and residential properties in the Anacostia and Good Hope Road corridors during major events. FEMA's 2021 flood map revisions for DC substantially increased the number of properties in required flood insurance zones along both rivers.