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Thesis
Opportunities for Leveraging Existing Hydrologic and Hydraulic Models Developed for Water Quantity Management to Mitigate Flooding Due to Extreme Precipitation
Master of Science (M.S.), Drexel University
Jun 2022
DOI:
https://doi.org/10.17918/00001154
Abstract
With a focus on a specific flood-prone community of Camden, NJ, this paper presents results of a detailed hydraulic and hydrologic (H&H) modeling project that assesses the impacts of climate change on Combined Sewer Overflows (CSOs) and localized flooding under two different infrastructure scenarios. Currently, the Clean Water Act compels regulated utilities to develop Long-Term Control Plans to reduce combined sewer overflows (CSOs), with no explicit mandate for simultaneously considering flooding within the service areas. Typically, H&H model models are used to evaluate CSO volumes and frequencies under historical conditions, with different CSO control measures in place. However, by modifying precipitation and raising water levels in receiving water bodies, ongoing climate change could also impact CSOs. This study uses calibrated and validated 1D and 2D Personal Computer Stormwater Management Model (PCSWMM) simulations to predict CSO discharges and flooding under different climate and infrastructure scenarios. A total of ten climate changes scenarios are investigated under low, median and extreme future projections. Each of these climate scenarios are considered with, and without the removal of a stormwater overflow connection from an upstream municipality (Pennsauken, NJ) in place. The simulated results suggest varying magnitudes of reductions under proposed infrastructure considerations , but maintaining a maximum 37% reduction in volume of cumulative annual CSO discharge. Under existing infrastructure conditions, increases in precipitation increase CSOs, whereas sea level rise (SLR) increases flooding. The proposed mitigation strategy can reduce both CSOs and flooding, but with diminishing effectiveness as a result of climate change. Areas for further analysis regarding alternative mitigation methods and future research are outlined.
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Details
- Title
- Opportunities for Leveraging Existing Hydrologic and Hydraulic Models Developed for Water Quantity Management to Mitigate Flooding Due to Extreme Precipitation
- Creators
- Brandon F. Hensyl
- Contributors
- Franco Montalto (Advisor)
- Awarding Institution
- Drexel University
- Degree Awarded
- Master of Science (M.S.)
- Publisher
- Drexel University; Philadelphia, Pennsylvania
- Number of pages
- x, 37 pages
- Resource Type
- Thesis
- Language
- English
- Academic Unit
- Civil (and Architectural) Engineering [Historical]; College of Engineering (1970-2026); Drexel University
- Other Identifier
- 991018527108204721