Opportunities for Leveraging Existing Hydrologic and Hydraulic Models Developed for Water Quantity Management to Mitigate Flooding Due to Extreme Precipitation

• DOI: 10.14796/jwmm.c516
• Publication Date: 2024-05-07T13:59:23Z
• Authors: Brandon F. Hensyl; Sanaz Borhani; ; Ahmad H. Payab; ; Franco Montalto
• Keywords: Combined sewer; Flood control

With a focus on specific flood-prone community in Camden, NJ, this research utilizes detailed hydraulic and hydrologic (H&H) model to assesses the impacts of climate change Combined Sewer Overflows (CSOs) localized flooding under two different infrastructure scenarios. In US, Clean Water Act compels regulated utilities develop Long-Term Control Plans reduce combined sewer overflows (CSOs), but there is no parallel mandate simultaneously within associated service areas. control measures place, H&H models are frequently used evaluate CSO volumes frequencies historical conditions. However, precipitation intensification sea level rise (SLR) will also modify volumes. This study uses calibrated validated 1D 2D Personal Computer Stormwater Management Model (PCSWMM) simulation predict both discharges A total ten scenarios comprising range plausible futures considered. The scenario that tested would divert stormwater generated an upstream municipality (Pennsauken, NJ) away from Camden’s system. Without disconnection, increases increase CSOs, whereas SLR primarily flooding. proposed mitigation strategy can immediately CSOs flooding, with diminishing effectiveness over time, as demonstrates need for supplemental measures. Areas further analysis regarding alternative methods future outlined.