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Another factor often overlooked is that the area of soil exposed to infiltration beneath a typical pervious pavement is large, and when combined with a detention layer beneath the pervious surface, results in even a poorly infiltrating soil absorbing a very significant volume of water. Another factor often overlooked is that a natural clay soil produces early runoff, while a pervious surface both delays the onset of runoff, and reduces the volume of runoff, both beneficial to the stormwater system and receiving stream.

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