Impervious Surface
An Impervious Surface is a hard surface area that either prevents or retards the entry of water into the sail mantle or causes water to run off the surface in greater quantities or at an increased rate of flow. Common impervious surfaces include, but are not limited to, rooftops, walkways, patios, driveways, parking lots, storage areas, concrete or asphalt paving, and gravel roads.
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