Study On Technology Of Urban Rainwater Biological Retention Pool

As urbanization process quickens,natural ecological water circulation system has been influenced by the development of economy,leading to the bad results,such as the emergence of extreme weather,and the waterlogging disasters that occurred in the cities.These make out the city drainage system construction of our country face great challenge.Therefore,the concept of sponge city came into being.This emerging technology based on low impact development technology and suit for China’s nation-al conditions which has a rapid development in our country.Biological detention basi-n is the common means in the sponge city construction.Nevertheless,with the wide use of traditional biological detention basin in our country,we found out that would be losing function by the blocking for the reasons as design and maintenance.This essay would summarize several common kinds of biological detention basin,and introduce the research status,design principle,structural style,selection of plants and maintenance management.By consulting the literature,analyze the design principle of the traditional biological detention basin with it merit and demerit.Identify the problem,such as the defect of maintenance management,the loss of function by internal plug and the irrational choice of the plants.On this basis,analyze and design the optimized schemes of structural style and vegetation choice.Through the experimental research,blockage of traditional bioretention ponds which would be jammed after rain were proved.In the mean time,the congestion in optimized schemes of structure of bioretention ponds were obviously reduced,and this optimized bioretention ponds maintained its function much longer.When infiltrating same concentration of rainwater,optimized bioretention ponds pured more clear and was infiltrated faster.Which proved the optimized bioretention ponds was better.The affect of purification and time of descolation of optimized bioretention ponds with vegetation were much better than the same ponds without vegetation.and the more deep the rhizome went,the more waterlogged,drought-tolerant vegetation could be,the better the bioretention pondscould function.According to the research and analysis,optimized bioretention ponds could do better in affect of purification,time of descolation,design of structre,appearance of jam.All these facts were showing that the optimized schemes of structural style and vegetation choice could be applied in future.