Late in summer 2010, the University of New Hampshire Stormwater Center (UNHSC) initiated research on permeable interlocking concrete pavements (PICP).   Approximately 14,000 square feet of permeable interlocking concrete pavers were installed on a driveway and parking lot, replacing an existing, worn asphalt pavement 

The pavement cross section consists of 3-1/8 inch-thick permeable concrete pavers placed in a herringbone pattern.  A 4-inch-thick base layer is under the bedding material as well as a subbase layer that varies between 16 and 20 inches thick. The storage capacity of the base and subbase layers is expected to be sufficient to store water from most storms falling on the site, which receives about 43 inches in annual rainfall and approximately 60 inches of snow. 

A team of Stormwater Center researchers led by Dr. Robert Roseen will evaluate the hydrological and structural performance of the pavement system. The investigation will evaluate PICP cold climate functioning including water quality improvement and water infiltration performance and the results will be delivered as part of educational outreach by UNHSC through two PICP training sessions for design professionals, municipalities, and other agencies involved in stormwater management.  The first seminar is expected to be held in late summer 2011. 

Water volume measurements and pollutant monitoring by UNHSC will be compared to that from a nearby impermeable pavement and from sources in research literature.  Analytical testing of water samples includes: total nitrogen, total phosphate, and total zinc, total petroleum hydrocarbons (diesel range), and total suspended solids as well as pH, dissolved oxygen, conductivity, temperature, turbidity, and flow.