Pervious concrete

Pervious concrete is regular concrete without the sand — just crushed rock, portland cement, and water. It comes out looking like a giant rice cake. The voids between the bits of rock slurp up water at a rate of up to 350 inches per hour, which — take it from me — is beyond biblical.

Pervious concrete can take plenty of weight, so it's great for driveways, and other heavy-traffic surfaces. It can be colored, and the top can be ground for a smoother, more attractive surface.

For more information on this material, visit the Pervious Concrete Web site

( or (www.concrete

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