United States Department of Agriculture
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Types of Pervious Paving Systems

Porous Paving

Porous asphalt, crushed glass, or porous concrete installed over an infiltration storage bed of uniformly graded crushed rock.

Photo of walkway with both porous and non-porous paving.
A walking path includes both porous asphalt and non-porous asphalt. The porous asphalt allows rainwater to infiltrate while the nonporous surface has standing water.

Permeable Pavers (Modular Paver Blocks)

Modular concrete pavers that fit together with funnel-like openings installed over an infiltration storage bed of uniformly graded crushed rock.

Photo of parking area with permeable pavers.
This system prevents car-related pollutants on parking areas from reaching our rivers and streams.

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Last Modified: 07/05/2007