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Stormwater

Stormwater management is the process of controlling rain, sleet, hail, and melting snow and ice that drains off rooftops, driveways, roads and other hard surfaces that do not allow water to permeate into the ground. Once the stormwater runoff reaches grass or wooded areas, some runoff will soak into the ground but a large amount must be collected into the storm drainage system. In Fairfax County, the storm drainage system is separate from the sanitary sewer system. The runoff enters the storm drainage system via inlets located in curbs, yards or open pipes. The pipe systems carry the runoff either directly to streams or to detention ponds. In some locations, the runoff flows off the ground and directly into streams.

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Flooding

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Stormwater / Storm Drainage Facilities

Streams and Floodplains

Watersheds