The heavy rains that occurred from the night of June 10 to June 13 caused localized flooding in urban areas, flooding in low-lying areas, and flash floods on rivers in Da Nang city due to the impact of storm No. 1 (Wutip). This is considered a warning about the abnormality and anomaly of weather and natural disasters under the impact of climate change.
Rainfall measured on June 12, 2025 at Da Nang station (Trung Nu Vuong street) was 402.3mm, nearly double the historical value of the highest daily rainfall in May and June of 1979 (212.4mm).
Due to intermittent heavy rain, floods on the Nam and Bac rivers (upstream of the Cu De river) began to rise rapidly from the afternoon of June 11 and the flood peak appeared three times at Ta Lang - Gian Bi bridge on June 12 at 15.48m (at 1:30 a.m., about 6m higher than the time the flood appeared), 13.8m (at 7 a.m.) and 14.11m (at 9:30 p.m.).
According to the Da Nang Urban Infrastructure Management Center (Department of Construction), at 5:00 p.m. on June 11, when the water level upstream of the Nam My Dam rose to nearly 8m, the unit sent a notice to the local authorities and sent a message to a Zalo social network group with 32 members in the downstream area of the dam about opening the gate (pulling the gate up) at 9:00 p.m. the same day to drain the flood. The unit notified 3 hours earlier than the regulations of the operating procedure; issued a warning signal through the loudspeaker system (flood siren) 4 times. 12 gate gates were pulled up from 9:00 p.m. on June 11 to 1:20 a.m. on June 12.
Through the response to floods caused by storm No. 1, the Danang Urban Infrastructure Management Center followed the operating procedures of the Nam My Dam and coordinated (notified) promptly to local authorities and units in the affected area. According to records, at about 1:00 a.m. on June 12, when the 12 gates of the Nam My Dam were pulled up, the flood also began to rise and inundate the roads in Loc My village and Nam Yen village, Hoa Bac commune.
According to some experts and scientists , the Cu De River often experiences flash floods that rise quickly and are dangerous. Although the Nam My Dam does not have the function of cutting, reducing and regulating floods, it actually slows down the flood downstream for a few hours (before and during the time of pulling up the 12 sluice gates to drain the flood) so that units, businesses and people downstream have time to respond to flash floods.
To ensure the safety of the dam and downstream areas when there is a flash flood, Dr. Le Hung, lecturer at the Faculty of Hydraulic Construction, University of Technology - University of Danang, recommends that when heavy rains occur and the water level at the upstream of the Nam My Dam rises to 8m, the dam management and operation unit should raise the sluice gates early to allow the flood to drain quickly.
The recent heavy rain also caused most of the reservoirs in Da Nang city to be full of water, especially the water level of Hoa Trung lake rose 0.4m above the overflow threshold, posing a high risk of unsafety to the reservoirs.
Head of the Irrigation and Disaster Prevention Department, Department of Water Resources and Irrigation Management (Department of Agriculture and Environment) Ho Nguyen Quoc Dung said that in the process of monitoring, inspecting and supervising dams and reservoirs in the city, the unit recorded some positive results, but there are still many shortcomings and challenges.
To improve the efficiency of operations and ensure the safety of lakes and dams, the city has increased regular and surprise inspections of lakes and dams to promptly detect and repair damage; and promoted investment in repairing and upgrading degraded lakes and dams to ensure safety during the rainy and stormy season.
At the same time, build an automatic monitoring system for important lake and dam projects to promptly detect the risk of incidents; strengthen training and improve professional capacity for management and operation teams; cooperate with domestic and foreign units to research and apply new technology in monitoring and managing lakes and dams.
Along with that, build an early warning system for floods and regulate water properly to minimize damage; strengthen coordination between functional agencies, local authorities, businesses and lake and dam operators...
“Ensuring the safety of dams and reservoirs is not only a technical requirement, but also an important political task closely linked to the safety of people’s lives and property and the sustainable development of the city. To effectively carry out this task, there needs to be close, synchronous and continuous coordination between all levels, sectors, local authorities, and communities as well as the support of domestic and international organizations, experts and scientists, contributing to ensuring safety, flexibility and effective adaptation to natural disasters and climate change,” said Mr. Ho Nguyen Quoc Dung.
Source: https://baodanang.vn/bao-dam-an-toan-ho-dap-truoc-mua-mua-lu-3264848.html
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