Mengwa flood storage area is located in Funan County and Yingshang County, Fuyang City, Anhui Province, China, with a total area of about 180.4 square kilometers. It involves 4 townships, 75 administrative villages, 1, 3 1 village and platform, 1.7 million people, and the cultivated land area is 1.8 million mu. It is the first flood storage area established in 1953 Huaihe River Basin. Meng He flood diversion channel is located in the north of Mengwa flood storage area. Its main function is to divert the Huaihe River flood with the Huaihe River main channel and Mengwa flood storage area, with a total length of 54km, a width of 1.5~2km and a total area of 90km2. Meng He flood diversion channel is a wide and shallow plain channel, which passes through the floodplain and the main channel at the same time in flood season, and there is water only in the main channel in non-flood season, with a width of 50m and a depth of 3~4m. Because the cross section of the flood diversion channel is too wide, the flood diversion velocity decreases, which leads to serious siltation on the beach and affects the flood diversion effect. Moreover, because there is no water in the beach for a long time, illegal planting has been repeatedly banned, and it is difficult for local governments to remove obstacles before the flood season every year. Therefore, it is necessary to implement the deep channel flood diversion project of Meng He flood diversion channel.