Opening Conditions of Wangjiaba in Funan, Anhui Province —— Introduction of Wangjiaba in Funan, Anhui Province

1, at 8: 32 a.m. on July 20th, the Wangjiaba sluice of Huaihe River in Funan County, Fuyang City, Anhui Province was opened to discharge water, provided that the Mengwa flood storage area had been opened. This is the16th flood storage since Mengwa was built. Wangjiaba sluice is the only sluice on the Huaihe River that is dispatched by the national defense general, and is known as the "first sluice of the Huaihe River". Wangjiaba sluice, the full name of Wangjiaba intake sluice in Mengwa flood storage area of Huaihe River, is located in Funan County, Anhui Province, on the left bank of the middle and upper reaches of Huaihe River, at the intersection of three rivers (Gushi, Huaibin and Funan counties, Huaihe River, Honghe and Bailuyuan) in Henan and Anhui counties. It was named after the construction of a dam in Wangjiaba Town, Funan County. Wangjiaba sluice is the main control project in Mengwa flood storage area of Huaihe River. Built in 1953 and * *13 holes, each hole has a clear width of 8m, and the design flow rate is1334-1626m3/s.

2. Wangjiaba Sluice has a special geographical location, which is located at the junction of Henan and Anhui provinces, Huaibin, Gushi and Funan counties, and is also the intersection of Huaihe River, Red River and Bailu River.

3. The total length of Huaihe River 1000 km. From Wangjiaba sluice to the source of Huaihe River in Tongbai Mountain, Henan Province, the upper reaches of Huaihe River have a drop of178m, accounting for 90% of the total drop of 200m in Huaihe River. The river slope has dropped to five ten thousandths, the upstream slope is steep and the water is steep, and the flood goes straight to Wangjiaba, which makes Wangjiaba suffer great flood pressure. The middle reaches of Huaihe River are 490km from Wangjiaba Gate of Hongze Lake in Jiangsu Province to Sanhe Gate, with a drop of only 16m and a river ratio of 0.3 ‰. The river slope is gentle, narrow and curved, and the drainage is not smooth, so it is difficult for the flood to flow downstream quickly. There are many important cities, industrial and mining enterprises and traffic arteries in the middle reaches of Huaihe River. Therefore, ensuring the safety of the middle reaches of the Huaihe River is the top priority of flood control and flood fighting in the Huaihe River. The lower reaches of the Huaihe River are from the lower reaches of Sanhezha to Sanjiangying 146 km, where the Huaihe River joins the Yangtze River estuary, with a drop of 6 meters and a river ratio of 0.4/ 10000. The bottom of Hongze Lake, where Sanhe Sluice is located, is higher than the bottom of Huaihe River and the horizon of Hongze County 1 m, forming an "overground lake", and the flood becomes slower as it reaches the downstream. Therefore, there are many tributaries of the Huaihe River, the whole ends are inclined, the upstream gap is large, the middle reaches are narrow, and frequent rainstorms in the main flood season are the main characteristics of the Huaihe River flood control, which is also the main reason why the Huaihe River is difficult to control.

4. Due to the special geographical conditions of Huaihe River, Wangjiaba sluice located at the intersection of Sanjiang River is of great significance and is called "the first sluice of Huaihe River". Wangjiaba sluice is also known as the "barometer" of flood control in Huaihe River and the "weather vane" of disaster in Huaihe River.