Porous asphalt is an environmentally friendly tool for stormwater management.

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Routine maintenance is simply a matter of periodically milling (about every 15 to 20 years) the surface for recycling, followed by placement of a smooth new overlay.	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.	Porous asphalt pavement is an economically sound choice.	Constructing a Perpetual Pavement today means that future generations will probably never need to replace the pavement structure.
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