As asphalt becomes more expensive and in short supply, and as the need to manage stormwater runoff increases, designers must revisit old assumptions and take a fresh look at how pavements need to work in a sustainable environment, and how to design and specify for them. Pervious pavements are a recent addition to the list of viable paving options, but as yet, there have been few ways to design them and to effectively predict their performance. This article offers some help to accomplish those tasks.
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