On September 29, according to information from Tri An Hydropower Company, as of 2:00 p.m. on September 29, the water level of Tri An Lake reached nearly 60.8 m (safe elevation is 62 m), the water flow to the lake was 1,060 m3/s and the total discharge to downstream was 1,142 m3/s.
Compared to September 25, the lake water level (approximately 61m), water flow into the lake (1,400 m3/s) and total discharge to downstream (from 1,440-1,490 m3/s) have all decreased.
Previously, on September 28, Tri An Hydropower Company issued a notice about reducing the spillway to regulate the reservoir. Based on the decreasing water flow to Tri An reservoir and to reduce the possible impact on the downstream, Tri An Hydropower Company reduced the amount of water released to regulate the reservoir.
The reduction time is from 2:00 p.m. on September 28. At that time, the water flow through the spillway is 320 m3/s, a 50% reduction compared to before. The water flow through the power turbine is from 800 - 850 m3/s. The total water flow downstream is from 1,120 - 1,170 m3/s.
Then, depending on the weather and water levels downstream at Bien Hoa Hydrological Station, the company can change the flow of water discharged through the spillway.
Tri An Hydropower Plant was inaugurated and put into operation in 1991. Currently, the plant has 4 units, with a total designed capacity of 400MW. This is the largest hydropower project in the Southern region, contributing greatly to the national grid, helping to regulate water sources for daily life, production, repelling salinity and regulating floods for downstream areas.
