Work is almost complete on the porous asphalt lot at Crest Acura. The permeable base is shown below. The project was designed by Natural Systems Engineering and construction is being performed by Rich & Gardner Construction Company (Syracuse, New York). In addition to managing incident precipitation to the ~15,000 sq ft lot, the project will also infiltrate runoff from the adjoining Crest Acura showroom and service areas. A total of 1.5 million gallons of stormwater will be managed annually.
On June 1-2, 2015, following placement of the permeable base course shown below, NSE measured the site-wide infiltration rate through the roof sump/overflow catch basin. Following the June 1 rain event, the site exhibited an infiltration rate of 0.35 in/hr. Based on this rate, the infiltration basin will completely dewater in roughly 10 hours assuming no additional rainwater input.