BMP PERFORMANCE COMPARISONS: EXAMPLES FROM THE INTERNATIONAL STORMWATER BMP DATABASE
Abstract:This paper explores the relative pollutant removal performance of several BMPs using data contained in the International Stormwater BMP Database. These BMPs include retention ponds, extended detention basins, and vegetated swales. While the Database contains numerous studies with varying amounts of detail, this comparison is based on the performance of only those sites with reported basic design characteristics and water quality data (event mean concentrations) so that constituent concentrations can be accurately determined and related to the design of the individual BMP. The use of selected BMPs has a number of advantages. Some of the variability in performance observed for facilities of a specific type can be explained by differences in design and/or watershed characteristics; consequently, the expected performance for a given set of conditions can be predicted more accurately. In addition, the differences in performance among BMP types for a given set of conditions can also be established with a higher degree of certainty. Finally, the screening process allows the identification of a number of prominent data gaps that should be targeted in future monitoring activities.
The principle measure of performance for each of the BMPs under consideration is their discharge quality. This was found to be largely a function of the influent concentrations for many constituents. A comparison of the discharge quality as a function of the concentration in untreated runoff demonstrates substantial differences in performance among these BMPs for many constituents.
Document Type: Research Article
Publication date: January 1, 2005
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