Performance of Regenerative Stormwater Conveyance on the Removal of Dissolved Pollutants: Field Scale Simulation Study
Publication: Journal of Environmental Engineering
Volume 144, Issue 6
Abstract
Regenerative stormwater conveyance (RSC) is a stormwater control measure (SCM) built in a channel that uses a series of riffles, grade control structures, and pools with an underlying sand media layer to detain and treat stormwater runoff. A purpose-built experimental field RSC was subjected to simulated hydrographs by mixing dissolved nitrogen and phosphorus into inflow from a managed retention pond. The system storage capacity of within the pools () and sand layer () was sized to store the runoff volume from the 25-mm event. Twelve storm simulations were conducted under varying conditions of storm depth (25 and 38 mm) and antecedent dry periods (1 day and 3 days). Simulations confirmed that RSC can convert large portions of flow volumes from surface to subsurface flow; mean reductions in surface flow volumes were 80% for the 25-mm event and 40% for the 38-mm event. Reductions in dissolved pollutant concentrations in surface flow were insignificant or very minor for all analytes. However, mean reductions in subsurface flow concentrations were high for both total Kjeldahl nitrogen (TKN, 79%) and orthophosphate (81%). Because of well-drained subsurface conditions, nitrification of TKN to nitrate was observed, leading to a 250% increase in nitrate concentration. Results of the simulation study indicate that microbial transformation and sorption mechanisms are present in RSC subsurface outflow. Subsurface flow contributed 66% of the total nitrogen load and 42% of the total phosphorus load for the 25-mm event. When adequately sized, RSCs can provide substantial hydrologic mitigation for urban drainage areas. As implementation of RSC continues, regulators and designers are encouraged to consider RSC subsurface flow as an important contribution to downstream pollutant load. Proper filter media selection and differentiated aerobic/anaerobic conditions are essential to optimize subsurface flow treatment.
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Published In
Journal of Environmental Engineering
Volume 144 • Issue 6 • June 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Jan 9, 2017
Accepted: Nov 13, 2017
Published online: Mar 27, 2018
Published in print: Jun 1, 2018
Discussion open until: Aug 27, 2018
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