Assessing Cost-Effectiveness of Different System Structural Characteristics in Enhancing Resilience of Urban Drainage Systems

Different urban drainage system structural characteristics such as topological structure, return period of pipe-sizing, green infrastructures and grey infrastructures are both significant in designing and managing urban drainage systems. These characteristics can somehow influence the resilience of systems and research is required to determine their cost-effectiveness. This study uses 1000 virtual drainage systems to evaluate the effect of each system structural characteristic on enhancing resilience. The results show that it is more cost-effective to enhance resilience in planning stage especially by finding better topological structure. In operational stage, building storage tanks is more cost-effective than building LID, but considering the feasible site for storage tanks, it has limited effect on enhancing resilience.