Short-term hydrographic forecast and warning bulletin on July 21st of the National Center for Hydro-Meteorological Forecasting said:
With the Thao River, the water level at Yen Bai station and Phu Tho station is changing slowly.
Monitoring data at Yen Bai station at 7 am on July 21st was at 26.28m, at the same time at Phu Tho station at 13.17m.
It is forecasted that the water level of the Thao River at Yen Bai station and Phu Tho station will change slowly with a downward trend.
For the Lo River, the water level at Tuyen Quang station and Vu Quang station (Phu Tho) is and will continue to fluctuate under the influence of the upstream hydropower regulation.
Monitoring data at Tuyen Quang station at 7 am on July 21st was at 15.73m, at the same time at Vu Quang station at 8.42m.

With the Da River, the flow to Hoa Binh reservoir is and will continue to fluctuate according to the regulation of the above hydropower line.
At 7 am on July 21, the water level of Hoa Binh Lake was at 38.75m.
With the Red River, the downstream water level at the Hanoi hydrological station is and will continue to fluctuate according to the regulation of the above-line hydropower plant and be affected by tides.
At 7 am on July 21, the water level at Hanoi station was at 3.76m.
