Abstract
Best management practices (BMPs) are commonly used to reduce the adverse effects of post-construction runoff. BMP deterioration happens over time when these age and the infiltration rate decreases as a result of sediment accumulation. The objective of this paper was to investigate the effect of sediment accumulation on BMP stormwater runoff volume reduction performances. The BMPs studied included a bioswale and an infiltration trench. To undertake this research, both field tests and numerical simulations were conducted under five different and single rainfall events with a wide range of intensities and duration. The minimal sediment accumulation of 0.22 kg/m2·year was considered in this study. Three different sedimentation accumulation configurations (i.e., new, 2-year-old, and 10-year-old BMPs) were considered. According to the results, the infiltration trench had 100% runoff reduction efficiency in all conditions including high-intensity rain and 10-year-old BMP age. The performance of the bioswale for the first 2 and 10 years deteriorated by about 55% and 70%, respectively.
Highlights
Hydrologic performance of stormwater best management practices (BMPs) is critical to their effectiveness in reducing the adverse impacts of urbanization and development on receiving waters [1,2,3,4].While many studies show effectiveness of the BMPs in treating stormwater runoff quality, the focus of this paper is more on quanitity aspects
The National Cooperative Highway Research Program (NCHRP) 565 [5], NCHRP 728 [6] and NCHRP 792 [7] reports, which refer to the Poresky et al [1] study, summarized the monitoring data of BMP sites reported to the International BMP Database
Other studies show that the percentage runoff volume reduction for vegetated filter strips range from 40% to 85% and for vegetated swales from 50% to 94% [8,9]
Summary
Hydrologic performance of stormwater best management practices (BMPs) is critical to their effectiveness in reducing the adverse impacts of urbanization and development on receiving waters [1,2,3,4].While many studies show effectiveness of the BMPs in treating stormwater runoff quality, the focus of this paper is more on quanitity aspects. The National Cooperative Highway Research Program (NCHRP) 565 [5], NCHRP 728 [6] and NCHRP 792 [7] reports, which refer to the Poresky et al [1] study, summarized the monitoring data of BMP sites reported to the International BMP Database. This database shows an average volume reduction of 35% to 65% for bioswales with underdrain practices. The literature offers extensive information regarding BMP performance, monitoring efforts have been limited to short-term and localized evaluations
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