Determination of Optimal Meshness of Sewer Network Based on a Cost—Benefit Analysis

Urban pluvial flooding occurs when the capacity of sewer networks is surcharged due to large amounts runoff produced during intense rain events. Rapid urbanization processes and changes in climate increase these events frequency. Effective sustainable approaches for reduction urban floods are necessary. Although several gray, green hybrid measures have been studied, influence network structure on flood occurrence has not yet systematically evaluated. This study focuses evaluating how different structures a single drainage affect volumes their associated damages. Furthermore, cost–benefit analysis used determine best structure. As case study, subnetwork Dresden, Germany was selected. Scenarios corresponding layouts developed evaluated using event-wise hydrodynamic simulation. The results indicate that more meshed with lower damage. Moreover, all analyzed scenarios were identified as cost-effective, i.e., benefits terms damage outweighed costs related pipe installation, operation maintenance. However, predominantly branched scenario. present approach may provide new cost-effective solution can be integrated into development mitigation strategies management.