Multiyear Performance of a Pervious Concrete Infiltration Basin BMP
Publication: Journal of Irrigation and Drainage Engineering
Volume 137, Issue 6
Abstract
The use of infiltration storm-water best management practices (BMPs) has become a more commonly used approach as a means of reducing postdevelopment runoff volumes in many areas throughout the United States. Although studies regarding the performance of infiltration BMPs are emerging, much remains to be learned about their design, construction, and operation. The increase in knowledge will improve the performance and longevity of these BMPs. The performance of one such infiltration basin over a 2-year cycle is presented in this paper. The study site is a pervious concrete infiltration basin BMP built in 2002 in a courtyard common area at Villanova University. The system consists of three linked infiltration beds lined with geotextile filter fabric, filled with coarse aggregate, and overlaid with pervious concrete. The natural soil beneath the infiltration BMP is a silty sand. The BMP is extensively instrumented to facilitate water quantity and quality research. Both water-quantity and -quality results are presented. The water-quantity analysis showed that the performance of the basin was directly related to its infiltration characteristics. The infiltration rate of the silty sand is cyclic, with higher rates during warmer periods and lower rates during colder periods. The water quality analysis investigated the pollutant reduction for chloride, copper, nitrogen, and phosphorus from the inlet to the surface-water outlet of the structure, as well as differences in pollutant concentration levels between the basin, surrounding ground, and varying soil layer elevations beneath the basin. In general, the pollutant reduction to the surface waters was greater than 90% from inlet to outlet, primarily influenced by the infiltration of the storm water into the natural soils below the BMP. The pollutant concentration of the infiltrating runoff was found to be higher than expected in the area adjacent to the bed when compared to concentration levels found at a similar depth beneath the infiltration bed. Comparison of pollutant concentration levels, as the water moved from within the storage bed to the soil beneath the bed, were shown to vary, with statistical differences found for mean concentration levels of both pH and copper levels; and no statistical differences were found for conductivity, total phosphorous, and chloride at each elevation.
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Acknowledgments
Funding for construction of the pervious concrete infiltration basin BMP and monitoring the site was provided by the Pennsylvania Department of Environmental Protection (PaDEP) through the EPA’s Section 319 Nonpoint Source Implementation Grant, as well as the PaDEP’s Growing Greener Grant program. Further research sources include the EPA Water Quality Cooperative Agreement (WQCA) program and the Villanova Urban Stormwater Partnership (VUSP) (www.villanova.edu/VUSP). This project has been designated as an EPA national monitoring site. This support does not imply endorsement of this project by EPA or PaDEP.
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© 2011 American Society of Civil Engineers.
History
Received: Mar 1, 2010
Accepted: Oct 1, 2010
Published online: Oct 19, 2010
Published in print: Jun 1, 2011
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