A resilience evaluation method considering functional and structural resilience of urban drainage systems

Resilience evaluation of urban drainage systems offers a deeper insight into the drainage systems' capability to enhance resilience and mitigate flood damages. Current research predominantly examines hydraulic or functional failures resulting from external loads like excessive rainfall, while giving less attention to structural failures caused by internal loads. A resilience evaluation method for the drainage system considering functional failure and structural failure is proposed. First, scenarios for structural and functional failures are generated considering factors such as pipe age, flow velocity, and excessive rainfall. Second, three aspects of social, technical, and economic indicators are proposed to establish resilience evaluation metric. Third, the cloud model is utilized to comprehensively evaluate the resilience of urban drainage systems. Finally, a case study in Dongying City, Shandong Province, China, is carried out, and the results show that the total flood volume under the 50-a rainfall event considering structural failure is 70% higher than that without structural failure.