| Salient Features (as per Feasibility Study Report, 2010): |
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| Location |
: |
Thotane Khola, Bhadaure/Mamkha VDC’s, Okhaldunga District, Sagarmatha Zone, Eastern development region of Nepal |
| Latitude |
: |
27°16’25” N to 27°17’20” N |
| Longitude |
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86°35’00” E to 86°36’57” E. |
| Geology |
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|
| Region |
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Lesser Himalayan Zone |
| Rock composed |
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Quartzite, Phyllite |
| Geotechnical zoning |
: |
Very poor to fair |
| Hydrology |
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|
| Catchment area |
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71 km2 |
| 90% firm flow in the driest month |
: |
0.36 m3/s |
| Design flow (Q40) |
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1.14 m3/s |
| Flood 1 in 100 years |
: |
338 m3/sec |
| Weir |
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| Type |
: |
boulder lined |
| Length |
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23.85 m |
| Crest level |
: |
713.00 m amsl |
| Intake |
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|
| Type |
: |
Semi frontal intake |
| Number of orifice |
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3 |
| Orifice Size |
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0.5 x 1.00 m (w x h) |
| Invert level orifice |
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712.00 m amsl |
| Number of gates |
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3 |
| Gravel trap |
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| Type |
: |
Surface |
| Length |
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5.00 m (including transition) |
| Width |
: |
2.3 m |
| Height |
: |
3.5 m |
| Spillway level |
: |
713.00 m amsl |
| Gravel Flushing Canal |
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| Type |
: |
Surface |
| Length |
: |
50.60 m |
| Breadth |
: |
1.00 m |
| Height |
: |
1.95 m |
| Number of gates |
: |
1 nos. |
| Approach canal |
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| Type |
: |
Reinforced concrete rectangular culvert |
| Length |
: |
6.90 m |
| Bottom width |
: |
2.30 m |
| Height |
: |
1.76 m |
| Settling basin |
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| Type |
: |
Surface |
| Size |
: |
28 x 5 x 3.28 m (l x b x h) |
| No. of chambers |
: |
2 |
| No. of flushing channel |
: |
2 |
| Sediment Flushing Channel |
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| Type |
: |
Surface |
| Length |
: |
14.23 m |
| Breadth |
: |
0.5 m |
| Height |
: |
0.5 m |
| No. of gates |
: |
2 |
| Forebay |
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| Type |
: |
Surface |
| Width |
: |
5.25 m |
| Length |
: |
4.1 m |
| Height |
: |
2.84 m |
| Penstock Pipe |
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|
| Material |
: |
Steel |
| Length |
: |
2361 m |
| Internal diameter |
: |
800 mm |
| Thickness |
: |
8-16 mm |
| Anchor blocks |
: |
36 nos. |
| Y-Bends |
: |
1 no. |
| Branching |
: |
2 pipes of 570 mm internal diameter, 21 m long |
| Powerhouse |
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|
| Type |
: |
Surface |
| Length |
: |
16.5 m |
| Breadth |
: |
8.0 m |
| Height |
: |
12 m (from foundation level) |
| Number of generating units |
: |
2 (Two) each 340 KW |
| Turbine type |
: |
Horizontal Axis Francis Turbine |
| Installed capacity |
: |
680 KW |
| Tail water level |
: |
622.00 m amsl |
| Tailrace |
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|
| Type |
: |
Rectangular box culvert |
| Height |
: |
0.9 m |
| Width |
: |
1.5 m |
| Length of closed duct |
: |
11.90 m |
| Transmission Facilities |
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| Transmission line length |
: |
3 km from Powerhouse to Mathilo Bhadaure (the existing 11 KV transmission line) |
| Voltage level |
: |
11 KV |
| Power and Energy |
|
|
| Gross Head |
: |
91 m |
| Net Head at design discharge |
: |
73.20 m (at design discharge) |
| Installed Capacity |
: |
680 KW |
| Gross Annual Energy |
: |
4.41 GWh |
| Net Annual energy |
: |
4.24 GWh |
| Wet Energy |
: |
3.28 GWh |
| Dry Energy |
: |
0.95 GWh |
Construction Supervision and Design Support During Construction
HRE III
