Pervious Pavement Case Study
West Edge Porous Asphalt Parking Lot
Built in 2005, the West Edge porous asphalt lot was 14 years old at the time of testing. The lot received maintenance for at least the first five years of operation, but had received minimal maintenance since 2010. At approximately 5,000 square feet, its average pre-cleaning infiltration rate had fallen to just 3 in./hr. — well below the 10 in./hr. threshold required for hydraulic functionality. The lot was cleaned on July 8, 2019.
Elliot Alumni Center Porous Asphalt Parking Lot
Built in 2012, the Alumni Center lot was seven years old at time of testing. The lot received maintenance for the first two years of operation, after which no meaningful maintenance appeared to have occurred since 2014. At approximately 50,000 square feet, the lot was dramatically larger than the West Edge site. A small 2015 test of 200-square-foot sections by UNHSC staff (two hours of effort per location) confirmed restoration potential but also demonstrated the need for mechanized cleaning at scale. The lot was cleaned on July 10, 2019.
Independent Testing Confirmed Full Surface Restoration
The restoration results were exceptional at both sites. UNHSC’s research supports regular vacuum sweeping maintenance twice per year following initial restoration. The data also reveals significant differences in pollutant partitioning between liquid and solid fractions of the removed material — underscoring the importance of properly treating recovered waste, particularly in nitrogen-sensitive areas.
Both sites achieved infiltration rates well above the 100 in./hr. restoration threshold, confirming that even heavily neglected pervious surfaces — sites with no effective maintenance for 5 to 9 years — can be fully restored using the Triverus MCV.