Abstract
Low impact development (LID) is an important control measure against extreme rainfall events and is widely applied to relieve urban flood disasters. To investigate the effects of LID practices on flooding control under different rainfall scenarios, this paper constructs a rainfall–runoff model based on the storm water management model (SWMM) for a typical residential area in Guangzhou, China. The model is calibrated by using observed rainfall and runoff data. A total of 27 rainfall scenarios are constructed to simulate the change characteristics before and after the LID practices. Also, the projection pursuit method based on a particle swarm optimization (PSO) algorithm is used to assess the flooding characteristics. The results show that the constructed rainfall–runoff model can closely reflect the relationship between rainfall and runoff, with all Nash–Sutcliffe coefficients of efficiency (NSE) exceeding 0.7. It was found from the simulation and assessment of the constructed rainfall scenarios that the changes in rainfall characteristics have a considerable impact on the constructed drainage system and that LID practices can properly control the floods. However, with an increase in rainfall peak coefficient, intensity or duration, the control effects of LID tend to reduce. Particularly in the scenario of relatively high rainfall intensity, the impact of rainfall duration and the rainfall peak coefficient on the LID practices is minor.
Highlights
Along with significant changes in global climate and the considerably increasing disturbance caused by human activities, flood disasters in urban areas have become more serious, substantially restricting social and economic development and posing a threat to the safety of human lives and properties [1,2]
The storm water management model (SWMM) model is widely used to simulate the hydrologic performance of natural channels, rain and sewage diversion systems or other drainage systems, and it can evaluate the design of low impact development (LID) practices and best management practices (BMPs)
Rainfall has a great impact on urban flooding in the drainage system
Summary
Along with significant changes in global climate and the considerably increasing disturbance caused by human activities, flood disasters in urban areas have become more serious, substantially restricting social and economic development and posing a threat to the safety of human lives and properties [1,2]. Guangzhou requires the improvement of the drainage system capacity in areas through new construction [11]. Hong Kong and Chicago have introduced similar policies to improve drainage capacity [12]. Due to the restrictions on urban land resources, Singapore, Hong Kong, and Japan have constructed drainage pipes to divert water and water storage works to reduce the burden on downstream drainage [13,14]. Due to the restrictions on urban land resources, Singapore, Hong Kong, and Japan have constructed drainage pipes to divert water and water storage works to reduce the burden on downstream drainage [13,14]. (iii) Improve flood prevention ability
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