Effects of Surface Area and Inflow on the Performance of Stormwater Best Management Practices with Uncertainty Analysis
The performance of stormwater best management practices (BMPs) is affected by BMP geometric and hydrologic factors. The objective of this study was to investigate the effect of BMP surface area and inflow on BMP performance using the k-C* model with uncertainty analysis. Observed total suspended solids (TSS) from detention basins and retention ponds data sets in the International Stormwater BMP Database were used to build and evaluate the model. Detention basins are regarded as dry ponds because they do not always have water, whereas retention ponds have a permanent pool and are considered wet ponds. In this study, Latin hypercube sampling (LHS) was applied to consider uncertainty in both influent event mean concentration (EMC), C in, and the areal removal constant, k. The latter was estimated from the hydraulic loading rate, q, through use of a power function relationship. Results show that effluent EMC, C out, decreased as inflow decreased and as BMP surface area increased in both detention basins and retention ponds. However, the change in C out, depending on inflow and BMP surface area for detention basins, differed from the change in C out for retention ponds. Specifically, C in was more dominantly associated with the performance of the k-C* model of detention basins than were BMP surface area and inflow. For retention ponds, however, results suggest that BMP surface area and inflow both influenced changes in C out as well as C in. These results suggest that sensitive factors in the performance of the k-C* model are limited to C in for detention basins, whereas BMP surface area, inflow, and C in are important for retention ponds.
Keywords: International Stormwater BMP Database; Latin hypercube sampling; best management practice (BMP) surface area; detention basins; inflow; k-C* model; retention ponds; stormwater; uncertainty analysis
Document Type: Research Article
Publication date: 2013-09-01
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Water Environment Research (WER) publishes peer-reviewed research papers, research notes, state-of-the-art and critical reviews on original, fundamental and applied research in all scientific and technical areas related to water quality, pollution control, and management. An annual Literature Review provides a review of published books and articles on water quality topics from the previous year. Published as: Sewage Works Journal, 1928 - 1949; Sewage and Industrial Wastes, 1950 - 1959; Journal Water Pollution Control Federation, 1959 - Oct 1989; Research Journal Water Pollution Control Federation, Nov 1989 - 1991; Water Environment Research, 1992 - present.
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