Conference Agenda
Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).
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Daily Overview |
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Poster session: Poster session with drinks and snacks Location: HSB3 | |
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Poster
Cost-efficiency of integrating network separation and source control solutions to reduce combined sewer overflows Centre Eau Terre Environnement, Institut national de la recherche scientifique (INRS) Source control solutions (SCSs) are some of the most effective methods for mitigating Combined Sewer Overflows (CSOs), while offering numerous environmental and urban benefits including improved water quality. Quebec City, with its mix of separate and combined sewer networks, faces frequent CSO events. The city aims to reduce CSO frequency and volume through innovative approaches. This study evaluated the integration of gray and green SCSs to mitigate CSO volume and frequency. Using a SWMM model, the performance of integrating bioretention cells, permeable pavement, and small underground retention chambers was assessed in a 150 ha catchment. These measures reduced CSO volumes, compared to the reference scenario, by 56% from May to October 2017, the year where the highest total rainfall between 2010 and 2019 was recorded. Partial network separation in targeted areas further improved CSO reductions to 63%. This integrated approach highlights the effectiveness of combining green and gray infrastructure with network modifications to improve system performance. The findings indicate that bioretention cells are the most cost-effective solution, providing the highest cost efficiency per unit of CSO volume reduced. These strategies support Quebec City’s sustainability goals and contribute to a resilient urban water management system. | |