The Flood Risk Map is a countywide presentation illustrating overall flood risk identified and developed during the Risk MAP project.
Included are areas where new detailed studies have been performed, areas of mitigation interest, and the overall zones of flood risk.
The areas of mitigation interest include the 90-plus regulated dams in Loudoun County and essential facilities at risk of flooding. Select the map image to view the Flood Risk Map (PDF) .
Flood Risk Database
The Flood Risk Database includes Geographic Information System-based maps of depth of flooding, water elevation, percent annual chance of flooding at specific locations and percent chance of flooding at specific locations during a 30 year period (typical length of a mortgage loan). The image at right is an example map depicting the depth of water (in feet) at a specific location during a "1% annual chance" flood, commonly called a "100-year" flood.