Category: Water, Wastewater & Storm water
One of the concerns with the use of infiltration stormwater control measures (SCMs) is the potential for these practices to introduce contaminants to the subsurface. As the use of SCMs increases, the desire to understand the long-term effect, if any, these practices have on the subsurface in comparison to control sites. This study presents a comparison of four different infiltration SCMs, a rain garden, pervious concrete and porous asphalt in a parking area, and pervious concrete in a pedestrian area to two natural sites. A Kruskal-Wallis test for nonparametric data and a Mann-Whitney U-test were used to compare three different water quality parameters, total nitrogen, total phosphorus, and chlorides, for a minimum of 24 storm events over an 11 year period. Results indicated that only in two of 15 comparisons were sites significantly different across all parameters: between (a) a porous concrete site in a pedestrian center and a grassy site located adjacent to a parking lot and (b) a porous concrete site in a parking lot and a wooded site. This lack of consistent differentiation between pore water concentrations beneath SCMs and natural sites supports the safety and the validity of SCMs to treat pollutants found in stormwater.
Madeline Foley– William Penn Foundation Research Fellow, Villanova University Urban Stormwater Partnerships, Philadelphia, Pennsylvania
Andrea Welker– Professor and Associate Dean for Academic Affairs, Villanova University, Villanova University, Villanova, Pennsylvania
William Penn Foundation Research Fellow
Villanova University Urban Stormwater Partnerships
Professor and Associate Dean for Academic Affairs, Villanova University
Andrea L. Welker, PhD, PE is a Professor in the Civil and Environmental Engineering Department and the Associate Dean for Academic Affairs at Villanova University. She joined Villanova’s faculty after earning her PhD from The University of Texas at Austin. She is a registered Professional Engineer in the state of Pennsylvania. Most of Dr. Welker’s research focuses on studying the geotechnical aspects of stormwater control measures (SCMs) including rain gardens and permeable pavements. Dr. Welker is currently part of a multi-state, multi-year effort supported by the William Penn Foundation to ensure plentiful, clean water in the Delaware River Watershed. She is active in the Geo-Institute of the American Society of Civil Engineers and is the Senior Director of the Civil Engineering Division of the American Society for Engineering Education.