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Abstract
The purpose of this project is to investigate the effectiveness of an installation of permeable asphalt pavement almost a decade after its installation. The study performed sought to determine the installation's effects on stormwater discharge quantity and quality from the site. The goal was to draw conclusions on the overall system benefits that can be seen by implementing green infrastructure in stormwater control design as opposed to a more traditional grey water system. Study protocols and original water quality and quantity values were obtained from a previous study performed at the same site and were used for comparison purposes to evaluate the change in performance of the pavement over time. Volumes of water that were collected in carboys installed under the pavement at the site were measured and recorded. Data pertaining to the quantity of water that was infiltrated into the pavement instead of running off into a municipal combined sewer were obtained. The infiltration data were compared to rainfall data collected from the site in order to evaluate the infiltration efficiency of the permeable asphalt pavement system. Water samples were collected from the carboys and tested for BOD and TSS to assess water quality. Findings suggest that though the surface of the pavement has degraded significantly over time, the permeable asphalt pavement system is still allowing a significant amount of water to infiltrate into the subgrade soil, resulting in positive downstream effects on the municipal system. Water quality results were not quite as useful, but still suggest positive impacts on water quality resulting from infiltration through the permeable surface.