Stormwater Symposium

Oral

395083 - Risk Based Comparison of Green Infrastructure Design Under Present Day and Climate Change Scenarios

Tuesday, June 5
8:30 AM - 10:00 AM
Location: Mirage Room
Co-Authors: Bridget Wadzuk, Villanova, PA – Villanova University

Climate change is a global issue due to increasing temperatures, sea level rise, and changes in rainfall patterns. Flooding is projected to increase in certain areas as a result of increased precipitation due to climate change and increased urbanization and could worsen without having adequate infrastructure in place. Many cities are implementing green infrastructure (GI) practices to capture stormwater runoff and reduce the risk of flooding and combined sewer overflows (CSOs). Therefore, it is important for urban areas to understand the risk associated with urbanization and precipitation changes due to climate change.

This research explores the performance of various bioinfiltration designs from a risk-based perspective. Climate files for model runs were developed using the Coupled Model Intercomparison Project Phase 5 (CMIP5) projections under two representative concentration pathways (RCP 2.6 and RCP 8.5) for three, 30-year scenarios: present day, near-term future, and long-term future. A methodology for determining risk based on GI performance was developed to account for rainfall frequency, the probability of overflow occurrence, and overflow volume. Bioinfiltration designs with varying ponding depths, soil depths, and underlying native soil infiltration rates were examined to determine a range of performance under present day and climate change scenarios. Modelling for the various bioinfiltration designs was completed using the hydrologic model RECARGA for each climate scenario. The risk-based methodology was applied to model results and compared to pre-development conditions to determine if current bioinfiltration designs meet acceptable risk.

Conor John. Lewellyn

Graduate Research Assistant
Villanova University

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