Porous pavements move stormwater efficiently

In this Morris Arboretum parking lot at the University of Pennsylvania, Philadelphia, conventional/impervious asphalt for the driveway surface was used at right, and pervious asphalt was used in the parking bays.

Porous asphalt pavement cross-section Typical porous asphalt pavement consists of an open-graded asphalt surface (2½ inches), a top filter course of small aggregate, a deep stone reservoir course, and a bottom of filter fabric placed on uncompacted natural soils.

The parking lot at Morris Arboretum at the University of Pennsylvania, Philadelphia, is saturated during a hurricane. The rain runs off the standard asphalt (right) and drains into the pervious part (left).

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