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Porous asphalt as a parking surface
Porous asphalt allows water to run through the surface to a layer of gravel below the surface. Forty percent of the volume below the porous surface is air space that can fill with runoff water. This reduces the volume running into adjacent retention ponds and streams.
The disadvantage of porous asphalt and porous concrete is that the surface requires regular power washing to keep the pores open. Without this regular maintenance, pores quickly clog with soil and other debris.
