The application of mathematical model in the planning and design of stormwater pipe network

In response to limitations of traditional methods and potential design risks, and learning from the freamework of planning and design basic parameters of stormwater pipe networks, we propose a practical and operable technical application plan for model-assisted planning and design． This plan includes model-based pipe network design standard evaluation, bottleneck section analysis and urban flooding prevention evaluation． Through these steps, more comprehensive evaluation of drainage capacity of stormwater pipe network system can be conducted． Case studies show that this model-based pipe network design standard evaluation can verify whether the pipe network system meets predetermined design standards． By simulating design rainfall scenarios under different recurrence intervals, corresponding recurrence interval for drainage capacity of each section of the pipeline can be determined． Bottleneck section analysis can locate main problem sections, this will help to prioritize development of adjustment plans． Urban flooding prevention evaluation can locate “short board” sections in the system, this helps to take appropriate technical measures against “short board” sections, thereby to improve urban flooding prevention capabilities of entire pipe network system．