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Water 2015, 7(2), 615-633; doi:10.3390/w7020615

Quantifying the Fecal Coliform Loads in Urban Watersheds by Hydrologic/Hydraulic Modeling: Case Study of the Beauport River Watershed in Quebec

1
Instititut National de la Recherche Scientifique—Centre Eau Terre Environnement (INRS-ETE) (National Institute of Scientific Research—Centre on Water, Earth, and the Environment), 490 de la Couronne, Québec G1K 9A9, QC, Canada
2
Instititut National de la Recherche Scientifique—Centre Eau Terre Environnement (INRS-ETE) (National Institute of Scientific Research—Centre on Water, Earth, and the Environment, 490 de la Couronne, Québec G1K 9A9, QC, Canada
*
Author to whom correspondence should be addressed.
Academic Editor: Miklas Scholz
Received: 4 December 2014 / Accepted: 16 January 2015 / Published: 9 February 2015
(This article belongs to the Special Issue Sustainable Drainage Systems)
View Full-Text   |   Download PDF [3305 KB, uploaded 9 June 2015]   |  

Abstract

A three-step method for the identification of the main sources of fecal coliforms (FC) in urban waters and for the analysis of remedial actions is proposed. The method is based on (1) The statistical analysis of the relationship between rainfall and FC concentrations in urban rivers; (2) The simulation of hydrology and hydraulics; and (3) Scenario analysis. The proposed method was applied to the Beauport River watershed, in Canada, covering an area of 28.7 km2. FC loads and concentrations in the river, during and following rainfall events, were computed using the Storm Water Management Model (SWMM) hydrological/hydraulic simulation model combined with event mean concentrations. It was found that combined sewer overflows (CSOs) are the main FC sources, and that FC from stormwater runoff could still impair recreational activities in the Beauport River even if retention tanks were built to contain CSOs. Thus, intervention measures should be applied in order to reduce the concentration of FC in stormwater outfalls. The proposed method could be applied to water quality components other than FC, provided that they are present in stormwater runoff and/or CSOs, and that the time of concentration of the watershed is significantly lower than their persistence in urban waters. View Full-Text
Keywords: combined sewer overflows; fecal coliforms; runoff; scenario analysis; separate sewer system; stormwater management; SWMM; urban drainage; water quality modeling combined sewer overflows; fecal coliforms; runoff; scenario analysis; separate sewer system; stormwater management; SWMM; urban drainage; water quality modeling
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Thériault, A.; Duchesne, S. Quantifying the Fecal Coliform Loads in Urban Watersheds by Hydrologic/Hydraulic Modeling: Case Study of the Beauport River Watershed in Quebec. Water 2015, 7, 615-633.

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