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| On June 13 and 14, military forces were mobilized to remove cages stuck at An Trach dam. Photo: HOANG HIEP |
Director of Da Nang Irrigation Exploitation Company Tra Vu Quoc Tuan said that after the recent heavy rain, when the water level was low, the company was able to check the status of the An Trach dam's gate to see if it was still affected by the flood in order to have timely solutions, ensuring the operation of water supply for daily life, agricultural production as well as being ready to respond when heavy rain occurs. The flood caused the irrigation reservoirs managed and operated by the company to be full of water. The company will regulate the water source reasonably during the irrigation process for the agricultural production areas in the summer-autumn crop this year, not allowing risks to affect the safety of the reservoirs and dams.
In fact, during this flood, the hydroelectric reservoirs in the Vu Gia - Thu Bon river basin operated to reduce flooding for downstream areas but could not prevent the flood from rising and washing away the seasonal dam on the Vinh Dien river due to the large amount of rainfall downstream of the hydroelectric reservoirs. From the evening of June 12, when the 6 flood discharge compartments of the An Trach dam were stuck and blocked by floating cages, obstructing flood discharge, the A Vuong, Song Bung 4, and Song Bung 2 hydroelectric reservoirs were operated to completely cut off the flood for downstream areas. This both limited the flood from rising due to the An Trach dam's reduced flood discharge capacity and kept the dam safe. A Vuong Hydroelectric Joint Stock Company organized the safe operation of the reservoir and dam. By noon on June 15, the water flow to the A Vuong hydroelectric reservoir returned to normal. The water in the Song Bung 2, Song Bung 4, and Dak Mi 4 hydroelectric reservoirs were all close to the normal water level.
In the context of the seasonal dam on Vinh Dien River being swept away by flood on June 12 and the temporary dam on Quang Hue River not yet built, it is necessary to increase the water discharge to the downstream of Vu Gia and Thu Bon Rivers to maintain the river water level for pumping stations to operate normally and prevent salinity intrusion expected to reappear from late June, early July 2025. At the same time, create a large flood prevention capacity for hydroelectric reservoirs in the Vu Gia - Thu Bon River basin to both proactively operate to cut and reduce floods to avoid flooding for summer-autumn agricultural production areas when there is heavy rain, while ensuring the safety of reservoirs and dams.
According to Ngo Xuan The, Deputy General Director of A Vuong Hydropower Joint Stock Company, the Ministry of Industry and Trade is currently focusing on supplying electricity during the hot season, especially during peak electricity usage from July to August 2025. Therefore, Quang Nam province or Da Nang city should soon issue a document requesting hydropower plants to increase water discharge to ensure water supply, prevent salinity in downstream areas and proactively respond to heavy rains if they occur. From there, hydropower plants can also conveniently and proactively request to increase power generation by releasing water to downstream areas.
Chairman of the Board of Directors of Quang Nam Irrigation Exploitation Company Limited Nguyen Dinh Hai informed that after the dam to prevent saltwater intrusion and retain fresh water to serve agricultural production for Dien Ban town, Quang Nam province and Hoa Quy ward, Ngu Hanh Son district, Da Nang city was washed away, it is expected that in less than 2 weeks, saltwater will penetrate deep from the Han River to Vinh Dien River due to the semi-diurnal tide regime.
Therefore, hydropower plants in the upper reaches of the Vu Gia - Thu Bon River have increased water discharge to prevent saltwater intrusion for pumping stations. The downstream hydropower plants at the end of the Bung River, especially Song Bung 6 Hydropower Plant, do not retain water every weekend, meaning that the amount of water released from the upstream hydropower plants will be released by the downstream hydropower plants during the day to maintain the basic flow on the rivers to ensure the water level for the pumping stations to operate and maintain the flow to prevent saltwater intrusion.
HOANG HIEP
Source: https://baodanang.vn/xa-hoi/202506/tang-cuong-van-hanh-bao-dam-an-toan-ho-dap-4009812/
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