The Ministry of Agriculture and Environment has just issued a telegram on opening the Thac Ba hydroelectric reservoir surface spillway. The dispatch clearly stated that at 9:00 a.m. on September 9, 2025, the upstream water level of Thac Ba Lake was at 57.42 m, the downstream water level was 23.33 m, the flow to the lake was 280 m3/s, the total downstream flow was 272.85 m3/s.
Implementing the Inter-reservoir operation process in the Red River basin in Decision No. 740/QD-TTg dated June 17, 2019 of the Prime Minister, Decision No. 922/QD-TTg dated May 14, 2025 of the Prime Minister amending and supplementing a number of articles of the Inter-reservoir operation process in the Red River basin, the Minister of Agriculture and Environment ordered the Director of Thac Ba Hydropower Joint Stock Company:
Open 2 floodgates (No. 01 and No. 03) at 8:00 p.m. on September 9, 2025 to urgently bring the upstream water level of the lake to the elevation of 57.0m; then adjust the opening level to maintain the upstream water level not exceeding the elevation of 57.0m. Closely monitor the developments of floods, construction safety, flow to the reservoir, water levels upstream and downstream of the reservoir and promptly report to the Ministry of Agriculture and Environment (through the Department of Dyke Management and Natural Disaster Prevention and Control) and relevant agencies according to regulations.
On the same day, the Ministry of Agriculture and Environment sent an official dispatch to the People's Committees of the provinces and cities: Lao Cai, Tuyen Quang, Phu Tho, Hanoi on ensuring safety downstream when operating Thac Ba hydropower reservoir.
To ensure the safety of works and activities along the river, the Ministry of Agriculture and Environment recommends that People's Committees of provinces and cities immediately notify authorities at all levels, people, organizations operating on rivers and along rivers; aquaculture facilities, water transport vehicles; ferry terminals, vertical boats; review and ensure the safety of works under construction; sand and gravel mining activities, and transit to know about flood discharge in Thac Ba hydroelectric reservoir to proactively take preventive measures to ensure safety of people and property.
Timely report and propose solutions to handle unusual situations that may occur during the flood discharge process to the Ministry of Agriculture and Environment (through the Department of Dyke Management and Natural Disaster Prevention and Control).
