According to updated data at 7:00 PM on July 21, the water level of Hoa Binh hydropower reservoir at 6:00 PM was 102.95 m, 14.05 m lower than the normal water level. The water flow to the reservoir reached 3,954 m3/s, the total discharge volume was 4,446 m3/s, of which discharge through the spillway was 1,526 m3/s and through the plant was 2,920 m3/s.
In the Northwest region, Lai Chau Lake has a water level of 285.67 m, 9.33 m lower than the normal water level; Ban Chat Lake is 469.71 m, 5.29 m lower; Huoi Quang Lake is 369.63 m, 0.37 m lower; Son La Lake is 198.77 m, 16.23 m lower. Hoa Binh Lake is at 102.95 m.
Tuyen Quang Lake has a water level of 105.41 m, 14.59 m lower than the normal water level. Thac Ba Lake is at 52.23 m, 5.77 m lower.
In the North Central region, the water level of Trung Son Lake is 150.12 m, only 0.12 m higher than the dead water level; Ban Ve Lake 173.48 m; Khe Bo Lake 64.2 m; Quang Tri Lake 459.86 m.
In the South Central region, A Vuong Lake has a water level of 352.69 m, Song Bung 2 577.1 m, Vinh Son A 767.22 m, Song Bung 4 209.62 m, Song Tranh 2 152.01 m, Song Ba Ha 102.87 m and Song Hinh 201.43 m.
In the Central Highlands, Ialy Lake has a water level of 501.1 m, 13.9 m lower than the normal water level; Pleikrong 546.61 m; Se San 3 303.26 m; Se San 3A 238.5 m; Se San 4 211.6 m; Kanak 497.24 m; An Khe 428.3 m; Srepok 3 269.94 m and Buon Kuop 410.13 m.
Some hydroelectric reservoirs in the South Central region and Central Highlands are having large total discharges, of which Song Ba Ha reservoir discharges 136 m³/s, Ialy 219 m³/s, Pleikrong 284 m³/s, Se San 3 305 m³/s and Buon Kuop 297.23 m³/s.
In the Southeast region, Tri An reservoir has a water level of 51.44 m, 10.56 m lower than the normal water level. The water flow to the reservoir is 380 m3/s, the total discharge is 552 m3/s, all through the plant.
