SWMM And Infoworks Were Used To Simulate The Effect Of Pollutant Control

As the acceleration of development of cities and towns,permeable surface has been replaced by impervious material such as buildings,parking lots and other impermeable materials,leading to damage of city human environment and ecological environment,serious problems such as frequent urban waterlogging and serious water pollution need to be solved.As a result,low impact development of(LID)and the best management and treatment measures(BMPs)emerge as the times require,which is also an inevitable choice for the national development goal of strengthening the construction of ecosystem.Because our country starts late in this respect,and there are few cases in which software is used to simulate LID and BMPs measures in practical engineering,this paper is to combine the model with LID and BMPs measures and apply them to practical cases.In this paper,concept of low impact development is first introduced,mainly describing functional features and scope of application of LID technologies such as the rain garden,green space and permeable pavement,as well as BMPs used in impervious to regulate pool,and then according to the basic data of the research area,we decide to use the SWMM and Infoworks model software to simulate the LID and BMPs measures,combined with the actual situation,has established several design schemes,and USES the SWMM and Infoworks model software to establish the study area of rainwater,and then determine the corresponding parameters.According to the study area,the sub-catchment area is divided.It is mainly from different rainfall recurrence periods,different peak locations and different LID and BMPs land layout scenarios to simulate the hydrological,hydraulic and water quality aspects of the study area,which proves that under different rainfall recurrence periods,Under different rainfall peak location and different LID and BMPs land layout scenarios,the runoff,peak flow,water accumulation node,pipeline overload,pollutant discharge produced by LID and BMPs measures on rainfall runoff,Both pollutant concentration and pollutant accumulation can be reduced,but at the same time,there are somelimitations.Under different rainfall peak location,the change of rain peak location had little effect on the reduction of surface runoff water and water quality by LID and BMPs,and the total surface runoff was affected by different LID and BMPs land layout scenarios.The relationship between Peak discharge and Control effect of Total discharge of four pollutants: LID3 BMPs Land layout scenario(Concave Green infiltration pavement Rain Water Garden impermeable Storage Pool)> LID3 Land layout scenario(concave Type)Rain Water Garden > LID2 land layout scene(concave green infiltration paving)> LID1 land layout scenario(concave green space)> BMPs land layout scenario(impermeable storage pool).SWMM software and Infoworks software were used to simulate the total emission of various pollutants,and the results were compared.It was concluded that Infoworks software was more effective for the total emission of pollutants.