Evaluate The Effect Of Low Impact Development Stormwater Management Facilities

The process of urbanization in our country has gradually intensified.But too fast development also brings a series of problems to the city.This paper is aimed at the problem of flood and waterlogging caused by urbanization,and in response to the call of the state to build "sponge city".Research and utilization of rainwater landscape design method to solve the problem of urban stormwater management.Through the study of domestic and foreign outstanding cases,combined with China’s national conditions,the introduction of low impact development model of this new type of urban stormwater management concept.In this article,a numerical model,SWMM(Storm Water Management Model),was employed to run ten years’ continuous meteorological data(2003-2012)for the new campus of Tianjin University in order to contrast the difference between traditional stormwater management system and Low Impact Development stormwater management system and assess the performances of these LID alternatives,Bioretention,Grass swales,Infiltration trench,Porous pavement,Cistern system.Classification and discussion of the effects of each of the facilities in the water balance and flood control under different rainfall conditions.To further draw a single low impact on the applicability of the development of facilities,so as to guide the design and selection of urban planning builders for low impact development facilities.Research shows that low impact development model has played a great role in the management of rain and flood management,especially for light rain and short time.In the comparison of the applicability of different individual facilities,the permeable pavement has a relatively good effect on water balance and flood control.This indicates that the permeable pavement is suitable for the design of urban and regional with lower rainfall.Bio-retention also show good results,in the flood control performance is more significant.In this study,the use of long time series is simulated,and the accuracy of output results is improved.At the same time,it is the first time to put forward the performance index for water balance in the study(Iw),it can better compare the capacity of the different facilities of the stagnation and rain runoff.These research data and results can make a more intuitive understanding of the urban planning and construction of the ecological environment effect,water environment effect,climate effect,and the social and economic effects of the chain.And it can better guide the construction of the city in the future.