Abstract As global climate change and urbanization accelerate, urban rainwater and flood drainage systems are facing increasingly severe challenges. Traditional drainage system design methods are no longer able to meet the complex needs of modern cities. To improve the overall performance of urban rainwater and flood drainage system, a coupling model of multiobjective optimization algorithm and rainstorm management model is constructed. This model has been used for comprehensive optimization of urban rainwater and flood drainage systems. In the comparative analysis of the proposed coupling model, the standard deviation of the total overflow of the nodes was 65 million yuan. Then, the empirical analysis of the urban stormwater drainage system proposed in the study shows that the total discharge of the drainage outlet of the study model is 4428.73 and 1386.49, respectively, with the increase in time in the recurrence period of 2 and 50-year rainfall. In addition, the research model achieved remarkable results in the reduction in peak flow and water depth, increasing the drainage efficiency by 15.7% on average. This research not only provides new theoretical basis and practical guidance for the optimization design of urban rainwater and flood drainage systems, but also has important significance for enhancing the ability of cities to respond to extreme climate events and reducing urban water-logging disasters.
Xinchun Cao (Wed,) studied this question.