23COASTAL Enhancing Urban Flood Resilience through 1D-2D PCSWMM Modeling: A Case Study of Air Combat Command Campus, Joint Base Langley Eustis (JBLE)-Langley

Urban flooding is increasingly exacerbated by the combined effects of rapid urbanization, climate change, and aging drainage infrastructure. This study leverages the Personal Computer Storm Water Management Model (PCSWMM) for 1D-2D flood modeling to assess and mitigate flood risks within the Air Combat Command (ACC) Campus at Joint Base Langley Eustis (JBLE)-Langley. The simulation incorporated four scenarios based on 24-hour rainfall events corresponding to 2, 5, 10, and 25-year return periods, alongside tidal influences, to evaluate the existing drainage network's capacity and its response to projected future conditions. The analysis revealed that the current drainage infrastructure is insufficient to manage the area's stormwater load, both presently and in the face of anticipated changes. To address these challenges, various remediation strategies—such as the installation of duckbills, pipe clearing, and pipe replacement—were simulated to assess their effectiveness in reducing flood volumes. The results demonstrate that these interventions significantly enhance the system's resilience, offering a robust approach to flood hazard mitigation. This case study underscores the importance of integrating advanced modeling techniques with targeted infrastructure improvements to build urban flood resilience.