Sponge City Construction Based on Comprehensive Watershed Management

With the development of society, water problems caused by traditional urbanization have become increasingly serious. Sponge urban construction has begun to emerge, based on the sustainable concept, to improve the urban water system. In the urban renovation, however, designers and builders often do not consider the scope of the watershed comprehensively, which is easy to cause certain harm to the upstream and downstream cities. Therefore, it is significant to carry out innovative design of sponge city based on comprehensive watershed management. Based on the overall view of the basin system, this study puts forward improvement measures for the construction of sponge city, and uses SWMM model to simulate the flow and other parameters, and finally analyzes the benefits. The results show that: (1) The construction of the new sponge city can improve the drainage status of the city and the basin. The peak displacement effect can reach 20%, the peak reduction is about 65%, and the slope of the drainage curve slows down. (2) Implementing new measures of sponge city construction can improve the level of system ecology. The system ecological coefficient is increased from 0.65 to 0.78, the efficiency improvement rate can reach 20%, and the water quality improvement rate can reach 14%. This study provides some measures and ideas for the regional coordinated development of sponge city construction, which is conducive to sustainable development.