Hydrologic and Pollutant Removal Performance of a Full-Scale, Fully Functional Permeable Pavement Parking Lot
To meet the need for long-term, full-scale, replicated studies of permeable pavement systems used in their intended application (parking lot, roadway, etc.) across a range of climatic events, daily usage conditions, and maintenance regimes to evaluate these systems, the EPA's Urban Watershed Management Branch (UWMB) installed an instrumented, fully functional, 110-space pervious pavement parking lot to be used by EPA facility staff. The UWMB is monitoring water quantity and quality parameters in side-by-side porous asphalt (PA), porous concrete (PC), and permeable interlocking concrete paver (ICP) systems. The monitoring plan allows the EPA to document the performance of the three permeable pavements, identify environmental stressors in the infiltrate, and measure infiltrate volume. This site is equipped for long-term monitoring and the effect of regular maintenance will be investigated by examining changes in surface infiltration rates with time. Preliminary results indicate no significant changes in surface infiltration rates of the three permeable surfaces during the first year of use. Surface infiltration rates are significantly different among the three surfaces, with the PC having the largest measured rate and PA the lowest rate. Infiltrate from ICP had significantly larger SSC concentrations than infiltrate from PC and PA. This pattern may be explained by larger void spaces in the small aggregate (AASHTO #8 and #57) bedding and choking layers compared to the pore spaces in the PC and PA surfaces. Infiltrate heavy metals concentrations were measured across a broad spectrum of heavy metals, with varied results.
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Document Type: Research Article
Publication date: 2011-01-01
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