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Along with every house or building come paved sidewalks, roads, and parking lots that form a network for getting from here to there. Water can’t filter into the soil if paved surfaces stand in the way, and when it rains, large quantities of pollutants are picked up from the pave surfaces as the water runs off the impermeable pavement into creeks or storm sewers. When a watershed has 10 to 30 percent impervious cover, these negative effects on the ecology begin to appear.
