On September 24th, the Ban Ve Hydropower Company reported to the authorities regarding the operation of the Ban Ve reservoir to mitigate flooding downstream in anticipation of Typhoon No. 9. Accordingly, the plant will release water at a rate of 400 m³/s to 800 m³/s starting from 8 a.m. on September 24th.
Ban Ve Hydropower Plant is the largest hydropower project in North Central Vietnam.
Specifically, on the afternoon of September 23rd, the Civil Defense Command of Nghe An Province issued Document No. 931, instructing the Director of Ban Ve Hydropower Company to release water from the reservoir downstream at a rate of 400 m³/s to 800 m³/s. The operation began at 8 a.m. on September 24th, aiming to proactively lower the reservoir’s water level in preparation for a potential major flood expected from the evening of September 25th to the morning of September 26th.
According to forecasts, in the next 24 hours, the inflow into the Ban Ve reservoir could reach 250–300 m³/s, potentially increasing to 800 m³/s from September 25th.
Before Typhoon No. 9 made landfall, Ban Ve Hydropower Plant was ordered to release water at 400–800 m³/s.
If during operation, the inflow exceeds 1,000–1,200 m³/s or the water levels at Con Cuong and Cho Trang hydrological stations surpass Alert Level II, the Ban Ve Hydropower Company must adjust operations to reduce flooding downstream, following the approved Inter-Reservoir Operation Procedure by the Prime Minister.
If the reservoir’s water level reaches 200 meters, the company must gradually adjust the discharge rate to balance the incoming floodwater, ensuring the facility’s safety. Once meteorological and hydrological conditions normalize, with inflows below 1,000 m³/s and no forecast of heavy rain or flooding for the next 10 days, the reservoir will return to normal operation.
The Civil Defense Command also directed relevant departments and units to closely monitor and inspect the implementation of the operation order, ensuring compliance with regulations and minimizing potential downstream damage.
The water release aims to proactively lower the reservoir’s level ahead of the potential major flood from the evening of September 25th to the morning of September 26th.
Residents in downstream areas are advised to closely follow official updates from authorities and prepare response plans for adverse scenarios.
As of 9 p.m. on September 23rd, the upstream water level of the Ban Ve reservoir was at 196.2 meters, with an inflow of 274 m³/s. At that time, the plant was discharging 320 m³/s through the power station.
Typhoon No. 9 is expected to make landfall in the Quang Ninh–Hai Phong sea area from September 25th, with maximum wind speeds near the storm’s center reaching levels 9–11. From the evening of September 24th to September 26th, heavy to very heavy rainfall is expected in the Northern region, Thanh Hoa, and Nghe An, accompanied by high waves and rough seas.
Ban Ve Hydropower Plant is Nghe An Province’s largest hydropower project and the biggest in North Central Vietnam, with a designed capacity of 320 MW and a catchment area exceeding 8,700 km².
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