The new Milton middle school was built the summer of 2009. A portion of the parking lot is made with pervious or porous concrete. Porous concrete allows rain water to soak into the underlying soils. Pavement made with porous concrete do not pond water like regular pavements. The volume of stormwater runoff is also decreased, which is better for water quality.
A porous concrete mixture contains little or no sand, creating a substantial void content. This creates a system of highly permeable, interconnected voids that drain quickly.