Green Infrastructure

Milton Middle School Porous Parking Lot


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.


 Photo  of Milton Middle School parking lot. A portion of the driving surface is traditional blacktop, the parking area is mostly porous concrete.

Milton Middle School porous concrete parking lot.  The lighter color parking lot is porous, the darker color is traditional blacktop, which is not porous.  The school is located in Cabell County, WV and was constructed in the summer of 2009.



Photo of person pouring water from a bucket onto the porous concrete.  There is no pooling water, it immediately soaks into the porous concrete.

Water will soak into the subbase and underlying soils of the porous concrete rather than runoff into the stream.



Photo of Milton Middle School porous concrete parking lot. The school is in the background with a close up of the concrete in the foreground.

Porous concrete parking lot. The surface of the aggregate is more coarse, and is ADA compliant.  The sub-base of the porous pavement is approximately 14 inches thick. 


For more information about pervious concrete visit this website.

Brochure that provides an overview of pervious concrete and how it can be used for stormwater management. It contains good diagrams of pervious pavements. Published by the American Concrete Pavement Association. Download the brochure here.