What is impervious surface area?

Impervious surface area means a surface which is compacted or covered with material that is resistant to infiltration by water. In terms of the ordinance, it means the number of square feet of horizontal surface covered by buildings, and other impervious surfaces. Common examples include roofs, driveways, parking areas, sidewalks, patios, decks, tennis courts, concrete or asphalt streets, crushed stone, compacted gravel surfaces, or any other surface which impedes the natural infiltration of surface water.

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