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Pervious Pavement System Evaluation- Abstract
Rowe, A. A., M. BORST, T. OCONNOR, AND E. K. STANDER. Pervious Pavement System Evaluation- Abstract. Presented at World Environmental & Water Resources Congress 2009: 6th Urban Watershed Management Symposium, Kansas City, MO, May 17 - 21, 2009.
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Porous pavement is a low impact development stormwater control. The Urban Watershed Management Branch is evaluating interlocking concrete pavers as a popular implementation. The pavers themselves are impermeable, but the spaces between the pavers are backfilled with washed, graded stone that also acts as structural support for the pavers and allows water to infiltrate. Stormwater moves through several bedding layers after passing the paving stones and pollutants are removed. Recent literature shows that the concentration of total suspended solids in exfiltrate is substantially less than the infiltrate. Other pollutant constituents are subject to removal by microbial communities that develop with time. Concrete pavers were chosen for this investigation for a variety of reasons. The pavers allow for layers of the system to be removed, examined, and replaced, which is pertinent for long-term system monitoring and maintenance. The manufacturer claims the pavers have the strength and durability to handle the anticipated cars, trucks, and other equipment. The pollutant removal of a permeable interlocking concrete paver system is being evaluated with urban stormwater runoff from a 9 ¾-acre drainage area. Stormwater was delivered to the pavement system daily to accelerate aging of the system, while monitoring clogging and long-term pollutant removal. The role of microbial communities within the porous pavement system in pollutant removal is also being examined. It is important to evaluate stormwater water quality after filtration through porous pavement systems to see if the exfiltrate has improved sufficiently for release to surface or ground waters. The bench-scale phase of this study examined materials and system hydraulics to optimize for the full-scale experiment. An instrumented interlocking concrete paver area is in the process of being installed to monitor this system in a real-world environment for the full-scale study. The parking lot exfiltrate will be collected and monitored for selected water quality parameters and pollutants.