Nghe An province’s hydropower planning includes 32 projects with a total capacity of 1,259.7 MW approved by competent authorities. Of which, 22 projects have been built and put into operation.
The projects built and put into operation have contributed positively to the socio-economic development of the province and localities with hydropower: Providing clean energy for the national power grid about 3 billion kWh/year; contributing to the provincial budget about 650 billion VND/year); creating jobs for workers, contributing to improving the quality of human resources; contributing to environmental protection, reducing greenhouse gas emissions; some large hydropower projects such as Ban Ve, Hua Na contribute to limiting floods and droughts; strengthening infrastructure; contributing to shifting occupations and changing the economic structure in a more positive direction; expanding cultural exchanges along with socio-economic exchanges with other regions; contributing to hunger eradication and poverty reduction, improving social justice for local people, etc.
On the other hand, hydropower projects have caused and can cause negative impacts on all three aspects: environment, economy and society.
Therefore, the Provincial People’s Committee issued Decision No. 3775/QD-UBND dated September 25, 2019 on the implementation of the project “Investigation and assessment of negative impacts of the hydropower system in Nghe An on the environment and proposal of solutions to minimize impacts” assigned to the Center for Environment and Social Development (under the Union of Science and Technology Associations of Nghe An province) to preside over the implementation of the project.
In order to carry out the tasks assigned by the Provincial People’s Committee to the Department of Natural Resources and Environment to manage and sign a contract with the Center for Environment and Social Development (under the Union of Science and Technology Associations of Nghe An province), the project was implemented by the National Key Laboratory of River and Sea Dynamics (Institute of Water Resources), the Institute of Geography (Vietnam Academy of Science and Technology) and relevant agencies.
On September 8, 2023, the project was approved by the provincial acceptance council and the product was revised and completed in July 2024.
The main contents that have been implemented are:
Overview of natural conditions, socio-economic conditions, environment and current status of hydropower projects in Nghe An province;
Assess the impacts on the environment and society of the hydropower system in Nghe An;
Forecast the impacts of hydropower projects on the environment and socio-economy;
Propose solutions to improve the management efficiency of hydropower projects in Nghe An.
One of the important contents of the impact forecasting and solutions to improve the management efficiency of hydropower projects is to build a set of Flood Maps downstream of hydropower reservoirs with 16 scenarios of flood discharge and dam break.
On July 15, 2024, the Provincial People’s Committee issued Official Dispatch No. 5904/UBND-NN on assigning the Department of Natural Resources and Environment to preside over the announcement of the flood map product downstream of hydropower reservoirs in the province. The flood map product downstream of Ban Ve, Khe Bo, Chi Khe hydropower reservoirs in Nghe An province will be an important and practical source of documents for the implementation of emergency response plans and disaster response plans.
Pursuant to Official Dispatch No. 5904/UBND-NN dated July 15, 2024 of the Provincial People’s Committee assigning tasks, on September 27, 2024, the Department of Natural Resources and Environment respectfully announced the Flood Map Product Set downstream of Ban Ve, Khe Bo, Chi Khe hydropower reservoirs in Nghe An province to known agencies and organizations for research and work.
Set of flood maps of hydroelectric reservoirs in Nghe An province
Set of 16 flood maps were built for 12 flood discharge scenarios and 4 dam break scenarios:
– Scenarios of designed flood discharge reservoirs: 04 scenarios
– Scenarios of test flood discharge reservoirs: 04 scenarios
– Dam break scenarios, in these scenarios, the reservoirs have not been simulated to break independently: 04 scenarios
– Regular flood scenarios: 04 scenarios
The calculated scenarios are described in the table below:
|
No |
Simulation scenario |
Scenario’s Name |
Description |
|
1 |
Group of design flood discharge scenarios |
|
|
|
1.1 |
All reservoirs at the last step discharge the design flood |
Scenario 1.1 |
All reservoirs at the last step discharge the design flood including the Ca River branch, Chi Khe reservoir discharges the design flood at a frequency of 0.1%, Ban Mong reservoir discharges the flood 0.5%, Song Sao reservoir discharges the flood 1% |
|
1.2 |
Ban Ve Reservoir discharges the design flood, other reservoirs discharge 1% |
Scenario 1.2 |
Ban Ve Reservoir discharges the design flood 0.1%, Ban Mong Reservoir discharges the flood 1%, Song Sao reservoir discharges the flood 1% |
|
1.3 |
Ban Mong Reservoir discharges the design flood, other reservoirs discharge 1% Scenario |
Scenario 1.3 |
Ban Mong reservoir discharges the design flood 0.5%, Ban Ve reservoir discharges the flood 1%, Song Sao reservoir discharges the flood 1% |
|
1.4 |
Song Sao Reservoir discharges the design flood, other reservoirs discharge 1% Scenario |
Scenario 1.4 |
Reservoir Sao River discharges design flood 1%, Ban Ve reservoir discharges flood 1%, Ban Mong reservoir discharges flood 1% |
|
2 |
Group of test flood discharge scenarios |
|
|
|
2.1 |
All reservoirs at the last step discharge test flood Scenario |
Scenario 2.1 |
All reservoirs at the last step discharge test flood including Ca River branch, Chi Khe reservoir discharges test flood corresponding to frequency 0.02%, Ban Mong reservoir discharges flood 0.1%, Song Sao reservoir discharges flood 0.2% |
|
2.2 |
Ban Ve discharges test flood, other reservoirs discharge 1% Scenario |
Scenario 2.2 |
Ban Ve reservoir discharges test flood 0.02%, Ban Mong reservoir discharges flood 1%, Song Sao reservoir discharges flood 1% |
|
2.3 |
Ban Mong discharges test flood, other reservoirs discharge 1% Scenario |
Scenario 2.3 |
Ban Mong reservoir discharges test flood 0.1%, Ban Ve reservoir discharges flood 1%, Song Sao reservoir discharges flood 1% |
|
2.4 |
Song Sao test flood discharge, other lakes discharge 1% flood Scenario |
Scenario 2.4 |
Song Sao Reservoir discharges test flood 0.2%, Ban Ve Reservoir discharges 1% flood, Ban Mong Reservoir discharges 1% flood |
|
3 |
Group of dam break simulation scenarios |
|
|
|
3.1 |
Ban Ve Reservoir breaks, other lakes discharge 1% flood Scenario |
Scenario 3.1 |
Ban Ve Reservoir breaks when there is a 1% flood, other lakes discharge 1% flood |
|
3.2 |
Ban Chi Khe Reservoir breaks, other lakes discharge 1% flood Scenario |
Scenario 3.2 |
Chi Khe Reservoir breaks when there is a 1% flood, other lakes discharge 1% flood |
|
3.3 |
Ban Mong Reservoir breaks, other lakes discharge 1% flood Scenario |
Scenario 3.3 |
Ban Mong Reservoir breaks when there is a 1% flood, other lakes discharge 1% flood |
|
3.4 |
Song Sao Reservoir breaks, other lakes discharge 1% flood Scenario |
Scenario 3.4 |
Song Sao Reservoir breaks when there is a flood 1%, other reservoirs discharge flood corresponding to 1% flood |
|
4 |
Group of flood discharge scenarios by frequency |
|
|
|
4.1 |
Discharge all reservoirs with the flow corresponding to 2% flood frequency Scenario |
Scenario 4.1 |
All reservoirs discharge flood corresponding to 2% flood, flood from the middle area and the tributaries of the river corresponding to 2% flood |
|
4.2 |
Discharge all reservoirs with the flow corresponding to 5% flood frequency Scenario |
Scenario 4.2 |
All reservoirs discharge flood corresponding to 5% flood, flood from the middle area and the tributaries of the river corresponding to 5% flood |
|
4.3 |
Discharge all reservoirs with the flow corresponding to 10% flood frequency Scenario |
Scenario 4.3 |
All reservoirs discharge flood corresponding to 10% flood, flood from the middle area and the tributaries of the river corresponding to 10% flood |
|
4.4 |
Discharge all reservoirs with the flow corresponding to 20% flood frequency Scenario |
Scenario 4.4 |
All reservoirs discharge flood corresponding to 20% flood, flood from the middle area and the tributaries of the river corresponding to 20% flood middle and tributaries corresponding to 20% flood |
|
|
Total: 16 scenarios |
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