Latest information on flood flow to Ban Ve hydroelectric reservoir

(Dan Tri) - A particularly large flood at Ban Ve Hydropower Reservoir, with a flow of 12,800 m3/s, was recorded at 2:00 a.m. on July 23. By 11:00 a.m. on July 23, the water flow to the reservoir had decreased, reaching more than 5,400 m3/s.

Vietnam Electricity Group (EVN) has just updated information on the operation of Ban Ve Hydropower Reservoir ( Nghe An ). Citing information from Power Generation Corporation 1 (EVNGENCO1), EVN said that the flood started appearing at 4am on July 22 with a flow of 583m3/s, then increased rapidly to 1,500m3/s at 10am the same day, the lake water level was 189.69m.

At 4:00 p.m. the same day, the reservoir began to discharge flood control water at a flow rate of 508 m3/s through the spillway, combined with discharge through the project of 845 m3/s. The water level of the reservoir at the same time was 191.23 m (the lowest flood level was 191.5 m).

At the peak flood point (2am on July 23), the flood in the lake reached its peak flow of 12,800m3/s. The total water discharge was 3,285m3/s, the lake reduced about 74% of the peak flood flow to reduce flooding downstream.

The power company said that reducing floods downstream by retaining 74% of the peak flood flow at the hydroelectric reservoir caused the lake's water level to rise rapidly, and the lake gradually switched to an operating mode to ensure the safety of the project.

However, the downstream area is experiencing serious flooding, so the company has reported to the Chairman of the People's Committee of Nghe An province, requesting to switch from the operation mode to ensure project safety to the abnormal operation mode to limit water discharge downstream, in order to continue to reduce flooding downstream. This is an exceptionally large flood, exceeding the frequency of flood inspection (the flood inspection of Ban Ve hydropower project has a flow rate of 10,500m3/s).

Updates from EVN's hydropower reservoir water level monitoring system show that as of 11am on July 23, the water flow into Ban Ve hydropower reservoir reached 5,436m3/s, the total discharge was 3,985m3/s (6 surface discharge gates), the total discharge through the spillway was 3,646m3/s, the discharge through the plant was 339m3/s. The upstream water level was 200.17m, 45m higher than the dead water level.

Ban Ve Hydropower Plant operates flood discharge (Photo: Linh Chi).

Ban Ve Hydropower Plant is the largest hydropower project in Nghe An province and the North Central region, with a designed capacity of 320MW. The reservoir has a basin area of ​​more than 8,700km2, stretching across the communes of Luong Minh, Huu Khuong, Nhon Mai...

At around 24:00 on July 22, the Chairman of Nghe An Provincial People's Committee also signed and issued an urgent notice to localities and units about ensuring safety related to the flood discharge of Ban Ve Hydropower Reservoir.

Also on the morning of July 23, Mr. Tran Anh Tuan, Chairman of the People's Committee of Con Cuong Commune, Nghe An Province, said that the area had been hit by a flood due to heavy rain that lasted for many hours. The water level of the Lam River rose rapidly, approaching the historical flood peak recorded in 2018, causing isolation in many areas, especially low-lying areas along Highway 7.

Source: https://dantri.com.vn/kinh-doanh/thong-tin-moi-nhat-ve-luu-luong-lu-ve-ho-thuy-dien-ban-ve-20250723115210202.htm