Nghe An province directs Ban Ve hydropower plant to operate in a way that reduces flooding downstream.
The People's Committee of Nghe An province has just issued Official Document No. 203/BCH-PCTT dated September 17, 2024, regarding the order to operate flood control measures for the downstream area of Ban Ve hydropower plant.
Based on Decision No. 1605/QD-TTg dated November 13, 2019, of the Prime Minister on the promulgation of the Inter-Reservoir Operation Procedure on the Ca River Basin.
Based on the heavy rain warning bulletin for Nghe An province issued by the North Central Region Meteorological and Hydrological Station (Document No. MLDR 02/15h30/NGAN);
Based on Document No. 309/DBTB-DB dated September 17, 2024, from the North Central Region Meteorological and Hydrological Station regarding the advice on operating the Ban Ve hydroelectric reservoir;
+ The water level at Con Cuong Hydrological Station at 13:00 on September 17, 2024 was 25.13m, 2.87m below Warning Level I (WL I).
+ The water level at Cho Trang Hydrological Station at 13:00 on September 17, 2024 was 1.12m, below Warning Level I (WL I): 1.88m;
The water inflow into Ban Ve reservoir at 5 PM on September 17, 2024 was 543 m³.3/S;
The water level of Ban Ve Lake at 5 PM on September 17, 2024 was 197m;
+ The discharge flow through the turbines and spillway at 5 PM on September 17, 2024 was 541 m³.3/S;
+ Forecast: In the next 24 hours, the maximum inflow into the reservoir is likely to be at: 600 m3/s up to 700 m3/S.
As requested by the Chief of the Office of the Steering Committee for Disaster Prevention, Search and Rescue and Civil Defense (PCTT-TKCN and PTDS) of Nghe An province.
The Head of the Steering Committee for Disaster Prevention, Search and Rescue, and Civil Defense of Nghe An Province orders:
The Director of Ban Ve Hydropower Company operates the Ban Ve hydropower reservoir, releasing water downstream at a flow rate greater than the inflow of floodwaters into the reservoir to gradually lower the water level, but not lower than the value specified in Table 2 (as stipulated in point a, clause 1, Article 8, Decision No. 1605/QD-TTg dated November 13, 2019 of the Prime Minister).
The order execution time:7:00 AM, September 18, 2024;
Discharge rate through the structure:From 800 m3/s to under 1000 m3/S.
During the operation to lower the reservoir water level, if the water level at the Con Cuong Hydrological Station exceeds alarm level I but remains below alarm level II, or the inflow into the reservoir is less than 1,000 m³.3/s up to 1,200 m3The system then operates to release water through the structure at a flow rate equal to the inflow into the reservoir to maintain the reservoir water level.
During the process of lowering the reservoir water level, if a flood occurs causing the inflow into the reservoir to increase above 1,200 m³,3If the water level at the Con Cuong or Cho Trang hydrological station exceeds alarm level II, the Director of Ban Ve Hydropower Company shall operate flood control and reduction measures for the downstream area (as stipulated in point c, clause 1, Article 8 of Decision No. 1605/QD-TTg dated November 13, 2019, of the Prime Minister). During the operation of flood control and reduction for the downstream area, if the reservoir water level is likely to reach 200m, the Director of Ban Ve Hydropower Company shall gradually adjust the discharge flow through the structure so that when the reservoir water level reaches 200m, the discharge flow through the structure equals the inflow of floodwater into the reservoir and switches to a mode ensuring the safety of the structure.
After implementing flood control and reduction operations for the downstream area, if the reservoir water level is higher than the value in Table 1 (of the Inter-Reservoir Operation Procedure on the Ca River Basin), then operations should be carried out to gradually lower the reservoir water level to the highest pre-flood level specified in Table 1 if the following situations occur: The water level at the Con Cuong Hydrological Station has fallen below Warning Level I; The water level at the Con Cuong Hydrological Station is still above Warning Level I but below Warning Level II and a new rainfall event is forecast.
When the inflow into the reservoir gradually decreases to below 1,000 m3According to forecasts from the General Department of Meteorology and Hydrology for the next 10 days, no weather patterns that could cause heavy rain or flooding will appear in localities along the Ca River basin. The Director of Ban Ve Hydropower Company stated that operations are proceeding under normal conditions.
The Departments of Agriculture and Rural Development, Industry and Trade, and the Standing Office of the Provincial Steering Committee for Disaster Prevention, Search and Rescue, and Disaster Relief, according to their assigned functions and duties, shall inspect and supervise the implementation of the operational order in accordance with regulations, minimizing damage to downstream areas.
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On the same day, the Provincial Steering Committee for Flood and Storm Prevention, Search and Rescue and Civil Defense issued Official Document No. 204/VP-PCTT regarding ensuring safety when operating flood control for the downstream area of Ban Ve Reservoir.
To proactively respond and minimize damage during flood control operations for downstream areas, the Standing Office of the Provincial Steering Committee for Flood and Storm Prevention, Control, and Disaster Relief proposes:
The People's Committees of the districts of Tuong Duong, Con Cuong, Anh Son, Do Luong, Thanh Chuong, Nam Dan, Hung Nguyen, Nghi Loc and Vinh City; Heads of provincial departments, boards, and agencies; Directors of irrigation limited liability companies and related units: Inform all levels of government, the public, organizations operating on and along the river; aquaculture facilities on the river, water transport vehicles; ferry crossings; and production, business, and sand and gravel mining activities about the release of water from the hydropower reservoir so that they can proactively take preventive measures to ensure the safety of people and property.
Review flood prevention and control plans to ensure safety for downstream areas, especially the dike system and densely populated areas along the riverbanks, in order to be ready to respond;
Directing information and communication agencies to increase the duration and frequency of news coverage on various media, especially the radio systems in wards, communes, and towns, regarding the release of water from reservoirs; and coordinating with specialized agencies to guide people and relevant agencies and units on flood prevention skills to implement response measures and minimize damage caused by reservoir water releases.
The provincial Radio and Television Station, Nghe An Newspaper, and other news agencies and media outlets should increase broadcast time to report on the operation of the Ban Ve hydropower reservoir to reduce flooding downstream, the management work of the Provincial Steering Committee for Flood and Storm Prevention and Control and Search and Rescue, and provincial departments and agencies, so that local authorities and people can proactively take preventive measures.
