Stormwater Simulation Based on The Concept of Sustainable Development of Sponge City Construction

In recent years, urban flood disaster has intensified due to the frequent urban stormwaters in China. It has seriously restricted the healthy sustainable development of cities. Therefore, it is very important to simulate the urban Stormwater waterlogging process by using a mathematical model, and to assess the risk of waterlogging and drainage capacity for urban flood prevention and mitigation. The stormwater of the Xiaoyi City in China is simulated by using MIKE 21 and MIKE URBAN models. The main conclusions include: (1)The Stormwater flooded area and depth has simulated in the urban stormwater, and the Stormwater on "2016.7.19" was used to verify the models. The results show that the model has good applicability. (2)Under the different rainfall intensities of 1a, 3a and 5a, the Stormwater flooded area, which water depth ≥27 cm and duration ≥30 min, is increased from 1.46 km2 to 3.21 km2 and 4.49 km2, respectively, accounting for the total waterlogging area about 42.3%, 44.3%, and 48.0%. (3)The lack of drainage capacity is the main reason for the floods in the study area. Under the current conditions, with a drainage capacity of less than 3 years, the total length of the pipe network is about 18.77 km and accounting for 86.57% of the total length of the pipe network. These results can provide technical support for the urban flood control in the study area.