According to the data of Suzhou Meteorological Bureau, Suzhou is located in the south of the Yangtze River, with low terrain and many rivers and lakes, which is easily affected by rainfall. Suzhou City will experience many rainfall processes every year, especially in summer and rainy season, with heavy rainfall, which will easily lead to the rise of river water level and urban water accumulation. In addition, Suzhou's drainage system is relatively old and its drainage capacity is limited, which also increases the risk of floods. So Suzhou is prone to floods.