Flood Resilience Assessment of Urban Drainage Systems: A Graph Theory Perspective

In urban areas experiencing intense rainfall, inadequate drainage network capacity can lead to runoff flooding from manholes, resulting in urban floods and disruptions to various infrastructure, including road networks. Developing a fast and robust model is essential for addressing this functionality failure in urban drainage networks (UDNs) and enhancing resilience. This research introduces a novel method for calculating flood volume in urban drainage networks using the graph theory method. The graph- based approach proposes modified graph metrics to rout the runoff in conduits, enabling the identification of overflow conditions for accurate flood calculations. This methodology is applied in a real case study in an alpine city area, and the resilience values calculated for rainfall durations of 10, 15, 20, and 30 minutes, along with return periods of 1 to 100 years, demonstrate a strong consistency with results obtained from a stormwater management model (SWMM) utilizing dynamic wave methods for flow routing.