Reservoir Water Situation Reports of NamNgum-1 Date : 4/09/2018 at 08:00 AM

Reservoir Water Situation Reports of NamNgum-1 Date : 4/09/2018 at 08:00 AM

1. Reservoir water level and Tail water level

- Reservoir water level 212.98 m.asl, Reservoir water Volume  =  7,329,642,200 m³  , Water level has increased 13 cm  compared to 08:00 am yesterday morning

- Tail water level 172.0 m.asl has increased 60 cm compared to 08:00 am yesterday morning

2. Reservoir Inflow and Outflow of NamNgum-1 HPP

  A.  Reservoir Inflow                                      = 2,336.81 m³/s  = 33,650,064  m³/day

All amount included: - inflow from NNG-2                = 1,635  m³/s    = 23,544,000   m³/day

( At 06:00 AM 4/09/2018,the Height of Spillways gate opened has been increased from 1.5 m

to 1.8 m)

- inflow from others sources  = 701.81   m³/s      =  10,106,640     m³/day

B. Reservoir Outflow                                      = 1,846.85  m3/s   = 26,594,640 m³/day

All amount included: - Turbines Discharge                = 519.62   m³/s    = 7,482,528   m³/day

- Spillway Discharge            = 1,327.23 m³/s    = 19,112,112   m³/day

- At 07: 30 am 4/09/2018, the Height of Spillways gate opened has been increased from 3.5 m to 3.8 m, Spillways discharge = 1,479.10 m³/s

- Rainfall at NamNgum1 Raingauge is 25 mm

C. Pak ka ngoung gauge the water level at 11.50 m

• Flow at Pak ka ngoung gauge Qpn                                  = 3,168.81m³/s

All amount included: - Flow from NamNgum 1 (Qng1)                 = 1,846.85 m³/s

- Flow fom Nam Lik1-2 (Qnl1-2)= 295.5 m³/s

(At 13:00 PM 1/09/2018, the Height of Spillways gate opened has been reduced from 2.0 m to 1.5 m)

- Flow from others small tributeries (Q) = 386.16m³/s

3. Reservoir Water Balance (A-B) = 489.96  m³/s = 7,055,424 m³/day

Therefore : Reservoir water level has increased 13 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 can not contact
• Water level at Pak ka ngoung gauge is 11.50 m at 08:00 am it is seen that water level has increased 45 cm
• Water level at Boungphao gauge has increased 60 cm compared to 08:00 am yesterday morning
• Water level at Ban Cheng gauge has increased 86 cm compared to 08:00 am yesterday morning
• Water level at Ban Choom gauge can not contact
• Water level at Ban Tanpiow  gauge has increased 50 cm compared to 08:00 am yesterday morning
• Water level at Ban Hatsuan gauge can not contact
• Water level at Vernkham gauge is 13.12 m at 08:00 am it is seen that water level has increased 6 cm (13.06)

Director of NamNgum-1 HPP