4 large hydroelectric reservoirs in the old Quang Nam province, including Song Tranh 2, A Vuong, Dak Mi 4 and Song Bung 4, simultaneously announced the operation of regulating and lowering the lake water level to welcome floods, ensuring safety downstream.
Following the direction of the Chairman of the Da Nang People's Committee and Official Dispatch No. 208 of the Prime Minister, lake owners have implemented water regulation operations to create flood prevention capacity and proactively respond to heavy rain.
Accordingly, continuously from last night, November 4 to 4:00 p.m. on November 6 - Song Tranh Hydropower Company started to release and regulate water downstream with a flow of 300460 m3/s, bringing the lake water level to 172 m.
During this time frame, A Vuong hydropower plant also released 150400 m3/s. At Bung 4 River, discharge is carried out from 2001,500 m3/s, depending on the amount of water flowing into the lake...
The simultaneous release of regulators will help lower the lake's water level, ensuring flood reception capacity for downstream Quang Nam - Da Nang before the upcoming heavy rain due to the circulation of storm No. 13.
The amount of water released is greater than the amount of water into the lake, proactively welcoming floods
According to updated data on reservoir operation on November 4-5, the above-mentioned large hydroelectric reservoirs are discharging more water into the reservoir, clearly demonstrating the policy of proactively lowering water levels to welcome floods.
In A Vuong, the amount of water flowing into the lake (Qve) is only 228.19 m3/s, while the flow of discharge through the spillway and generating electricity is up to 594.19 m3/s (of which 515.19 m3/s is through the spillway, generating electricity at 79 m3/s) - that is more than 2.5 times the amount of water flowing into the lake.
At Bung 4 River, the embankment is about 562 m3/s, but the total discharge is 1,053 m3/s. Similarly, Dak Mi 4 Hydropower Plant discharged more than 548m3/s, while the amount of water into the reservoir was only 232.52 m3/s.
The lakes are slowly lowering water levels, creating safe reserve capacity before major floods occur. This is the period of discharge to regulate, welcome floods, without having to discharge to reduce floods, helping to ensure empty capacity for the next heavy rain, while limiting the risk of reservoir overload when storm No. 13 makes landfall.
Currently, floods on Vu Gia and Thu Bon rivers are fluctuating between below alert level 1 and below alert level 2, Tam Ky river is receding slowly.
Da Nang City Civil Defense Department warns that from November 6 to November 8, floods on rivers in Da Nang are likely to rise again. The flood peak on the Vu Gia - Thu Bon river ranges from alert level 2 to alert level 3. There is a high risk of flooding in low-lying areas along rivers, flooding in urban areas, flash floods, landslides on steep slopes, along rivers in mountainous areas.
