The county maintains the public storm drainage system contained within dedicated storm drainage easements. The Virginia Department of Transportation maintains the storm systems in public street rights-of-way. Storm systems on land owned by other public bodies such as the Fairfax County Park Authority, Fairfax County Public Schools and the federal government are maintained by those entities. There are also numerous private systems that are the responsibility of private property owners, including driveway culverts and bridges that cross public drainage systems.
Special Flood Hazard Areas are high risk areas that have a one-percent chance of being inundated by a base flood in any given year as identified by the National Flood Insurance Program maps. Floodplain management regulations must be enforced and mandatory purchase of flood insurance applies for these areas. For more information, please visit FEMA's Special Flood Hazard Area website or see the Special Flood Hazard Area Maps.
Fairfax County has developed comprehensive watershed management plans for each of the county's 30 watersheds. A watershed management plan serves as a tool to identify and address the issues affecting our environment and to protect and restore the county's streams and other water resources.
You can open the map and click on a watershed name in the map to find completed plans, plans in development and to get involved in your watershed.
To help customers develop quality construction plans for county review, Fairfax County has launched a GIS application, the Floodplain Viewer. Understanding the complexities of Fairfax’s floodplain data is key when considering potential construction in these areas. The Floodplain Viewer allows customers and the public to access centralized floodplain data and related information through one application.
Fairfax County Government Center Campus Stormwater Management Facilities
A new interactive map is available to guide you along a walking tour of stormwater management facilities located on the Fairfax County Government Center Campus. On the walking tour, learn how ponds, a native meadow, a restored stream, bioretention areas, swales, green roofs, and permeable pavers collect runoff to control flooding, encourage detention and infiltration, and improve water quality.