What is watershed/impervious area?
Impervious areas or impervious ground cover is any structure or ground cover consisting of asphalt, concrete, gravel, brick, terrazzo, roofing, ceramic tile or any other natural or man made material that prevents the absorption of surface water into the soil. Watershed is only a certain percentage of land that can be covered with impervious area. This affects building permitted on a lot. To determine if a lot is in the watershed area, consult the Water Quality Program at 704-336-5500.