Play a good role in flood control, ensuring safety in downstream areas
Due to the impact of prolonged heavy rain, a major flood has occurred in the upstream of the Ban Ve Hydropower Reservoir in recent days. The flood started at 3:00 p.m. on August 3, when the reservoir was at dead water level (158.8 m). After only 3 days, at 1:15 a.m. on August 6, the flood reached its peak with the largest flow rate of 2,700 m 3 / s.
After reaching its peak, the flood receded slowly and remained at a high level. At 2:00 p.m. on August 9, the flood flow into the lake was at 950 m3 /s, Ban Ve Lake was at an elevation of 184.7 m (nearly 7 m lower than the lowest flood level, 8 m lower than the highest water level before the flood).
The storage of water in the lake and flood control for the downstream area has caused the lake's water level to increase rapidly. In just 6 days, by August 9, the water level on the lake had increased by about 30m, equivalent to the total water volume in the lake reaching nearly 800 million m3 . Not only was the water level increase high, but it also lasted for a long time; and according to the representative of the Ban Ve Hydropower Company, the water flow and time in the lake like this rarely happened in the history of the operation of the Ban Ve Hydropower Reservoir.
Mr. Nguyen Truong Thanh - Chief of Office of the Provincial Steering Committee for Natural Disaster Prevention - Search and Rescue and Civil Defense stated: In recent days, the water flow from Laos has been very large, thanks to the Ban Ve reservoir storing water, the flood has been cut, ensuring safety for the downstream area without any impact. Data from 20 rain gauge stations in Laos of the Company shows that the rainfall in recent days in Laos has been very large, at an average of 400 mm. From August 3 to 9, the amount of water flowing into the lake has reached nearly 800 million m3 . If this volume of water flows downstream, it will cause great impacts on production and people's lives.
Plan to discharge water and regulate floods
According to the forecast of the North Central Hydrometeorological Station, the water flow to Ban Ve Hydropower Reservoir is currently decreasing but still remains at a high level. To ensure the safety of the project and ensure operation according to the Inter-reservoir Operation Procedure in the Ca River Basin, Ban Ve Hydropower Company has sent Report No. 203/BC-TDBV to the Provincial Steering Committee for Natural Disaster Prevention - Search and Rescue and Civil Defense, asking for direction on the operation of Ban Ve Reservoir to reduce flooding downstream.
Mr. Ta Huu Hung - Director of Ban Ve Hydropower Company said: We are currently focusing on closely monitoring the rainfall and weather developments in the Ban Ve reservoir basin. If floodwaters continue to flow, the possibility of having to regulate and release floodwaters is very high. Given the impacts on downstream areas if flood discharge is implemented, the Company has worked and notified localities to urgently review the areas of crop, livestock, aquatic product production, and people's assets in the affected areas to have a response plan, minimizing damage caused by flood discharge.
At the meeting, after inspecting the actual situation at the construction site, Mr. Nguyen Truong Thanh stated: Right from the first flood in this year's rainy and stormy season, the extent and impact were very large, clearly showing the unpredictable risks due to climate change. Ban Ve Hydropower Company as well as downstream localities need to anticipate the risk of double floods like what happened in 2018, thereby raising vigilance, building reasonable response plans, avoiding being passive and confused when the situation occurs.
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