According to the bulletin of the National Center for Hydro-Meteorological Forecasting, in the Red River basin, the water level of the Thao River at Yen Bai and Phu Tho stations is decreasing, and is forecast to have an upward trend in the near future. Upper Thao River is likely to experience a small flood.
On the Lo River, water levels at Tuyen Quang and Vu Quang stations fluctuate due to rain and the influence of upstream hydropower regulation. Upper Lo River upstream is likely to experience a flood, with flood amplitudes rising above the rivers from 2-4 m.
At the Da River, the flow to Hoa Binh reservoir fluctuates according to the regulation of the above-line hydropower reservoirs and the impact of rain in the basin. The actual flow measured at Hoa Binh reservoir area at 7:00 AM on July 19 was 3,916 m3/s, forecast to fluctuate in the following hours.
The water level downstream of the Red River at Hanoi station is fluctuating according to the upstream hydropower regulation and the influence of tides, with a downward trend. At 7:00 AM on July 19, the water level at Hanoi station was 393 cm.
At rivers in the Thai Binh River basin, the water level of the Cau River at Dap Cau station, the Thuong River at Phu Lang Thuong station and the Luc Nam River at Luc Nam station continue to change slowly, affected by tides. The water level of the Thai Binh River at Pha Lai station is forecast to fluctuate from 1.20-1.80 m in the next 36 hours.
In the North Central region, the water level of the Ma River upstream continues to decrease, the midstream fluctuates according to reservoir regulation, the downstream at Giang station fluctuates according to tides. The Ca River has a slow upstream water level change, the midstream fluctuates according to reservoir regulation and the downstream fluctuates according to tides.
The water level of the Ngan Sau and Ngan Pho rivers in the La River basin changes slowly; the downstream of the La River fluctuates according to the tide. The Gianh River has a fluctuating upstream water level, the downstream is affected by the tide. The water level of the Huong River continues to change slowly.
In the South Central Coast, the water level of the Vu Gia River and the central and upstream Thu Bon River fluctuates slowly, while the downstream Thu Bon River fluctuates according to the tide. The water level of the Tra Khuc River fluctuates according to the regulation of reservoirs and tides. The Kon River at Thanh Hoa station fluctuates slightly according to the operation of irrigation works.
The water level downstream of the Ba River continues to fluctuate due to the influence of upstream hydropower regulation and tides.
In the Southeast region, the water level of the Dong Nai River at Ta Lai station fluctuates according to the upstream reservoir regulation. The water level of the Be River at Phuoc Hoa station fluctuates according to the reservoir regulation.
In the Central Highlands region, the water level of the Dak Bla River fluctuates according to the regulation of hydropower reservoirs. The Krong Ana River changes slowly, other rivers fluctuate according to the regulation of hydropower reservoirs.
At the headwaters of the Mekong River, the water level fluctuates according to the tide. On July 18, the highest water level on the Tien River at Tan Chau station is 2.07 m, on the Hau River at Chau Doc station is 2.15 m. It is forecasted that by July 23, the highest daily water level on the Tien River at Tan Chau will be 1.82 m and on the Hau River at Chau Doc will be 1.90 m.
