The Simulation And Control On Stormwater Runoff Pollution Of Urban Residential District

The pollution caused by the washoff of urban stormwater runoff from surface is the critical part of the non-point pollution. With deepened the control of the point pollution, it is serious day by day that the receiving water is polluted by urban stormwater runoff.The components in the urban stormwater runoff are very complicated, and its range of concentration change is so wide that makes the disposal very difficult. In order to control and dispose the pollution of urban stormwater runoff better, it is necessary to get know of the change characterization of pollutant's concentration and master its change law.This paper gets to command the whole pollution of residential district in Changsha by testing the pollution index and the volume of the runoff in different seasons, different catchment surface of many times rainfall, and ananyse its influence to the receiving body.By analyzing the relativity between the other indexs and SS which can be tested easily relatively,getting the relative equation which can simplify the furture analyse of the stormwater runoff in Changsha.By adopting some referenced and measrurable parameters in the runoff model, programming with Excel and Visual Basic, the model is tested its effiency and gets a better matching result between the simulation and the fact,so it can provide the feasible theroy parameter for the setting of the furture runoff disposal equipment,also it makes the design and the choice easily of the runoff pollution disposal in Changsha.In the end the paper puts forward some processing measure to the roof, the road surface, the gully,such as greening the roof,using the penetrable road face,filtrating the runoff of the gully,Flocculating sedimentation experimentation to the mixed sewage is desiged to find out the best kind and quantity of the flocculent agency,which provids a control and disposal way to the runoff of the residential district.This text also analyses the natural rain, the accumulated paticle in the road surface,the distribution of long-term stormwater runoff pollutant load, which is used to get know of the pollution of the stormwater runoff in the residential district of Changsha from many aspects,and also it supplies the comprehensive foundation data to the overall processing of the residential district.