Reservoir Water Situation Reports of Nam Ngum-1 on 03/09/2018 at 08:00AM
1. Reservoir water level and Tail water level
- Reservoir water level 212.85 m.asl, Reservoir water Volume = 7,287,308,000 m3 , Water level has increased 3 cm compared to 08:00 am yesterday morning
- Tail water level 171.40 m.asl has increased 10 cm compared to 08:00 am yesterday morning
2.Reservoir Inflow and Outflow of NamNgum-1 HPP
A. Reservoir Inflow = 1,760.6 m3/s = 152,116,224 m3/day
All amount included: - inflow from NNG-2 = 1,286.3 m3/s = 111,140,000 m3/day
( At 10: 00 AM 2/09/2018, the Height of Spillways gate opened has been decreased from 2.1 m
to 1.2 m)
- inflow from others sources = 474.3 m3/s = 40,979,520 m3/day
B. Reservoir Outflow = 1,647.5 m3/s = 142,347,024 m3/day
All amount included: - Turbines Discharge = 522.6 m3/s = 45,151,200 m3/day
- Spillway Discharge = 1,124.9 m3/s = 97,195,824 m3/day
- At 15:25 PM 2/09/2018, the Height of Spillways gate opened has been increased from 2.5 m to 3.0 m, Spillways discharge = 1,183.9 m3/s
- Rainfall at NamNgum1 Raingauge is 0 mm
C. Pak ka ngoung gauge the water level at 11.05 m
· Flow at Pak ka ngoung gauge Qpn = 2,962.6 m3/s
All amount included: - Flow from NamNgum 1 (Qng1) = 1,647.5 m3/s
- Flow from Nam Song River (Qns) = 440.6 m3/s
- Flow fom Nam Lik1-2 (Qnl1-2) = 286.4 m3/s
(At 13:00 PM 1/09/2018, the Height of Spillways gate opened has been decreased from 2.0 m to 1.5 m)
- Flow from others small tributeries (Q) = 588.1 m3/s
3. Reservoir Water Balance (A-B) = 113.1 m3/s = 9,771,840 m3/day
Therefore : Reservoir water level has increased 3 cm/Day
4. Streamgauge data along NL and NNG Downstream River compared to 08:00 AM yesterday morning as follow:
- Water level at Hinhuep gauge is 6.73 m it is seen that water level has decreased 43 cm
- Water level at Pak ka ngoung gauge is 11.05 m at 08:00 am it is seen that water level has decreased 3 cm
- Water level at Boungphao gauge has decreased 10 cm compared to 08:00 am yesterday morning
- Water level at Ban Cheng gauge can not contact
- Water level at Ban Choom gauge can not contact
- Water level at Ban Tanpiow gauge has decreased 2 cm compared to 08:00 am yesterday morning
- Water level at Ban Hatsuan gauge can not contact
- Water level at Vernkham gauge is 13.06 m at 08:00 am it is seen that water level has increased 1 cm