by Dan Orzech From Natural Home magazine

The next time it rains, look at your driveway. Much of the water washes off and into storm drains, carrying oil, grease and chemical residue from cars. This runoff can cause erosion, flooding and contamination of public waterways. Fortunately, permeable paving materials allow stormwater to soak into the earth, where naturally occurring bacteria help digest contaminants before they reach the water table. Called pervious or porous pavement, these systems keep groundwater clean, help tree roots breathe and reduce the severity of flash-flooding.

If you already have a driveway, does it make sense to rip it up and replace it with something porous? Probably not, if it’s in good shape. However, if your driveway is due to be repaved, or if you’re building a new house, it might be time to look into a pervious system.

Surfaces that allow seepage The simplest and cheapest way to let water run through your driveway is to build it w