Abstract：In order to overcome the problems of water environment and water ecology in the process of urban development, this study constructs the urban stormwater model to study the influence of different sponge measures on runoff production and confluence,and uses the measured rainfall runoff data to verify and calibrate the model. The results show that the permeable pavement has a significant runoff control effect on large, medium and small rainfall, and the permeable pavement has a better removal effect than the pollutants in rain garden dry streams.Based on the hydrological and water quality model constructed in the sponge demonstration area, the simulation of sponge engineering measures has a good reduction effect on the peak flow of single rainstorm and the total runoff.The peak flow at the outlet can be reduced by more than 60%, and the total annual runoff control rate is greater than 75%.The reduction of outflow runoff is different according to different magnitudes of rainstorm.With the increase of rainfall intensity,the reduction effect is weakened,and the strong rainfall can be reduced by more than 30%, and the general rainfall can be reduced by more than 60%. For the amount of discharged pollutants, after sponge transformation, the reduction rate of single rainstorm in the study area is more than 50%.
2021, Vol. 31 
