Urban Drainage System Planning Based On SWMM

In recent years,the urbanization process has led to the change of urban hydrological cycle,and extreme precipitation has occurred frequently.However,the existing drainage system has many problems,such as backward design methods and low standards,which results in serious urban waterlogging,rainstorm flooding roads and houses.The study of urban drainage system planning can provide scientific basis for the construction and operation of urban drainage project,which is of great significance to the transformation of urban drainage system and the development of social economy.In recent decades,SWMM model has been widely used in urban stormwater simulation and drainage network planning both at home and abroad,and has achieved good results.This paper takes the development zone of Luyanghu in Weinan Shaanxi as an example Based on the SWMM model,the planning and design of the drainage system in the new urban area are made.The main research results are as follows:1,According to the return period provisions of the "Outdoor Drainage Design Code"(GB 50014-2006)on the important areas of the city center,taking into account the importance of general aviation industry base to determine the return period of rainstorm is 10 years for the study area of drainage design standards.2,According to the original drainage gutter and the future development plan of the Luyanghu,aiming at the gravity drainage,the preliminary planning of the drainage system layout of the research area is made.Combined with the land use type and Road planning,The sub catchment area of the drainage canal were divided.3,Based on the traditional reasoning formula method,the design flow of each sub-catchment area is calculated.The design flow calculation of each sub catchment area by using the traditional reasoning formula method,combined with the tubing,the design velocity flow and pipe depth range were determined,then the drainage pipe(canal)section of the form,size and slope scale parameter were determined..4,Based on the SWMM,The urban stormwater flood simulation is established,and the simulation of rainwater drainage network under preliminary design rainstorm is carried out,and good results have been achieved.According to the simulation results,the node bottleneck of the drainage pipe network is identified,and the initial design is improved by the measures of increasing the diameter or slope by nodal overflow and pipeline overload.The final planning scheme is obtained,including the layout of the storm water pipe network,Node location,pipe(canal)form,size and slope.