Permeable pavers are alternatives that may be used to reduce imperviousness. While there are many different materials commercially available, permeable pavement may be divided into three basic types:
Porous bituminous asphalt
Permeable interlocking concrete pavements
Permeable pavements typically consist of a porous surface course and open graded stone base/sub-base or sand drainage system. Stormwater drains through the surface course, is captured in the drainage system, and infiltrates into the surrounding soils. Permeable pavements significantly reduce the amount of impervious cover, provide water quality and groundwater recharge benefits, and may help mitigate temperature increases.