Porous asphalt is an environmentally friendly tool for stormwater management.

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Constructing a Perpetual Pavement today means that future generations will probably never need to replace the pavement structure.	Perpetual asphalt pavements have actually been built in the U.S. for generations – even before engineers articulated the concept.	Perpetual Pavements are built so that only the top layer needs routine maintenance.	One of the earliest examples of a porous asphalt pavement is the parking lot for the visitor center at Walden Pond State Reservation in Massachusetts, which was constructed in 1977.
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