• Task: Feasibility study

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• Capacity: 74 KW

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• Status: Completed

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Salient Features (as per Feasibility Study Report, 2010):
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	:	86°35’00” E to 86°36’57” E.
Geology
Region	:	Lesser Himalayan Zone
Rock composed	:	Quartzite, Phyllite
Geotechnical zoning	:	Very poor to fair
Hydrology
Catchment area	:	71 km2
90% firm flow in the driest month	:	0.36 m3/s
Design flow (Q40)	:	1.14 m3/s
Flood 1 in 100 years	:	338 m3/sec
Weir
Type	:	boulder lined
Length	:	23.85 m
Crest level	:	713.00 m amsl
Intake
Type	:	Semi frontal intake
Number of orifice	:	3
Orifice Size	:	0.5 x 1.00 m (w x h)
Invert level orifice	:	712.00 m amsl
Number of gates	:	3
Gravel trap
Type	:	Surface
Length	:	5.00 m (including transition)
Width	:	2.3 m
Height	:	3.5 m
Spillway level	:	713.00 m amsl
Gravel Flushing Canal
Type	:	Surface
Length	:	50.60 m
Breadth	:	1.00 m
Height	:	1.95 m
Number of gates	:	1 nos.
Approach canal
Type	:	Reinforced concrete rectangular culvert
Length	:	6.90 m
Bottom width	:	2.30 m
Height	:	1.76 m
Settling basin
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
Type	:	Surface
Length	:	14.23 m
Breadth	:	0.5 m
Height	:	0.5 m
No. of gates	:	2
Forebay
Type	:	Surface
Width	:	5.25 m
Length	:	4.1 m
Height	:	2.84 m
Penstock Pipe
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
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
Type	:	Rectangular box culvert
Height	:	0.9 m
Width	:	1.5 m
Length of closed duct	:	11.90 m
Transmission Facilities
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