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Stormwater Quality Benefits of a Permeable Friction CourseChristina E. Stanard, M.S.E., Michael E. Barrett, Ph.D., Randall J. Charbeneau, Ph.D. ABSTRACT Permeable Friction Course (PFC) is a layer of porous asphalt approximately 5 cm thick which is applied over an impervious pavement base. The interconnected voids allow rainwater to drain into the overlay thus providing a safer driving surface in wet weather and a filter for highway runoff. This thesis describes a study on the stormwater quality benefits of PFC on a highway in Austin, Texas. The stormwater runoff was monitored before and after the installation of PFC in October 2004. Concentrations of total suspended solids, total phosphate, lead, zinc, and copper were significantly lower in the runoff from PFC than the runoff from conventional asphalt pavement. The concentrations of total and dissolved copper have slightly increased over time. Water quantity has also been monitored at this site since a collection system was installed in December 2006, and the PFC was found to have a runoff coefficient of 0.95. Comparison of runoff from PFC and conventional asphalt pavements at another site confirmed the reduction of pollutants and showed that the reduction of particulate pollutants is greater than pollutants in the dissolved form. The highlighted links that follow are connected to Adobe pdf files of the corresponding material. To view them you must have the Adobe Acrobat Reader 3.0. View the Report...(9234 KB)
These materials may be used for study, research, and education, but please credit the authors and the Center for Research in Water Resources, The University of Texas at Austin. All commercial rights reserved. Copyright 2002 Center for Research in Water Resources. |
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