Treatment Performance Of Pervious Pavement For Urban Road Runoff

This study is to investigate the effect of pervious concrete,grass brick,porous block pavements(low impact development technology,LID)on controlling surface runoff,delaying the time of peak flow and reducing the quantity of water in the network in a labortarty-scale;additionally,it verifies the effect of removing different pollutants by the permeable pavement at various conditions;On the basis of experiment,using the MIKE URBAN model simulates the effect of permeable pavement on improving drainage condition.It is found that permeable pavement can effectively control the road runoff.No runoff occurred on the permeable pavement surface when the rainfall intensity is 84 mm/h without inflow from other ereas.Permeable pavement can delay the time of peak outflow,reduce the quantity of max-flow in the pipeand improve the condition of drainage.When the rainfall intensityis 10 mm/h,grass brick,pervious concrete,pervious brick and permeable brick can delay the time of peak outflow by 10 min,10 min,15 min,10 min and reduce the max-outflow by 29.4%,13.6%,45.7% and 25.8%in the pipe;when the rainfall intensity is 20 mm/h,the time to peakdecrease to 5 min and the reduction of max-flow are 21.8%,10.8%,22.9% and 18.6%.In this study,the purpose is to explorepollutants removol rate of permeable pavementwith simulated runoff which is made by dust on the road collected by wet vacuum cleaner at different conditions.The experiment results show that the permeable pavement has better removal effect for the SS,removal rate can reach 85%.Permeable pavement can also remove TP,COD and TN,the experiment results show that the removal rate of TP,COD and TN can reach 60%,30% and 10%.Permeable pavement structure,surface type,rainfall intensity and dry period has influence on permeable pavement to remove pollutants.MIKE URBAN model is used in this study to evaluate the condition of the drainage inQi Shuyan sewage plant.Simulation results show that when the rainfall intensity up to 20 mm/h,drainage pipe network in Qi shuyan sewage plant can not meet the requirement of the drainage.Transforming the traditional road to permeable pavement,it is found that permeable pavement can greatly improve the condition of drainage in Qi shuyan sewage plant without changing the original drainage pipe network,the reduction of ponding depth and time are 0.27 m and 13 min.