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The use of a green infrastructure treatment train to capture street runoff: monitored and modeled stormwater capture performance of a three bed right-of-way bioretention facility
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The use of a green infrastructure treatment train to capture street runoff: monitored and modeled stormwater capture performance of a three bed right-of-way bioretention facility

Emily A. Pronchik
Master of Science (M.S.), Drexel University
May 2016
DOI:
https://doi.org/10.17918/etd-6871
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Abstract

Stormwater infiltration Urban runoff--Management Civil Engineering
This paper investigates the stormwater capture performance of a three bed, right-of-way bioretention facility installed the Bronx, NY. The facility is unique in that it was designed as a treatment train with four inlets and one outlet, with three planted beds, connected in series at the surface. On-site, continuous monitoring was used as to develop a basic water balance model that, in combination with Darcy's law, was then used to estimate the volumes of inflow, infiltration, and outflow from the system over the course of 21 precipitation events that occurred between May 2015 and October 2015. Cumulatively, over this monitoring period, the facility captured 907 m3 of inflow of which 79 m3 overflowed, retaining 92% of the runoff generated in its tributary areas. The mean percent tributary runoff retained per event was 94%. Total inlet efficiency varied from 134% to 666% based on the designed tributary area, and was found to be statistically related to the precipitation depth and intensity. Isolation of the effect of the third and second beds suggests that the implementation of the treatment train significantly improved performance of the entire facility, providing a 16% reduction in overflow volume for the nine largest events.

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