Project Location

Uttargaya Rural Municipality

District :

Rasuwa

Province No.

Bagmati

License boundary

Latitude

28°07’13” N to 28°09’43” N

Longitude

85°11’00” E to 85°12’30” E

Geology

Region

Lesser Himalaya Sequence

Rock composed

Phyllitic quartzite

Hydrology

Catchment area

37.17 km2

Annual mean flow

3.96 m3/sec

Design flow

2.90 m3/sec (42.18% exceedance of flow)

Flood 1 in 100 years

171.85 m3/sec

Flood 1 in 200 years

258.94 m3/s

Weir

Type

Boulder lined

Length

14.65 m

Crest level

2766 m amsl

Height

5 m (from river bed level)

Intake

Type

Side intake

Number of orifice

2

Orifice Size, (b x h)

2.0 m x 1.5 m

Invert level of orifice

2763.50 m amsl

Undersluice

Number of orifice

2

Orifice Size, (b x h)

2.0 m x 2.5 m

Invert level of orifice (bottom)                

2760.35 m amsl

Gravel trap

Type

Surface

Number

1

Length                                          

8.5 m (including transition)

Width                                                    

4.0 m

Height

4.1 m

Normal water level

2765.94 m amsl

Approach culvert

Type

Box

Number

1

Size (b x h)

1.8 m x 1.5 m

Length

110.18 m

Settling basin

Type

Surface

Size (l x b x h)

20 m x 4.25 m x 4.90 m each

No. of chambers

2

Normal water level

2765.81 m amsl

Flushing culvert size (b x h)                            

0.8 m x 0.7 m

Headrace Pipe

Length

1467.93 m

Diameter

1.2 m

Thickness of pipe

6 mm

Headrace Tunnel

Length

3462.50 m

Size

2.8 m x 2.8 m (excavation size)

Adit tunnel length

428 m

Surge Shaft

Type

Circular, RCC

Diameter

4 m

Height

26 m

Upsurge level

2774 m amsl

Downsurge level

2758 m amsl

Penstock

Type

Surface, inclined

Material

Mild Steel

Length

1084.83 m

Finish Diameter

1.2 m

Penstock shaft

Type

Vertical and horizontal

Material

Mild Steel

Length

223.60 m (vertical)

50.76 m (horizontal)

Cavern excavation diameter                                 

2.7 m (for vertical shaft)

2.8 m x 2.8 m (for horizontal shaft)

Finish Diameter           

0.85 m to 1.2 m                             

Powerhouse

Type

Underground

Length 

32 m

Breadth

10.9 m

Height  

18.60 m (from foundation level)

Turbine Axis 

2072.50 m amsl

Number of generating units 

2

Per unit capacity

8.76 MW

Turbine type

: Horizontal Axis Pelton turbine

Tailrace Tunnel

Type

Open channel tunnel

Length  

217.72 m

Size (b x h)

2.8 m x 2.8 m

Tail water level

2070.05 m amsl

Transmission Facilities

Transmission line

Approximately 2.75 km of 132 kV

transmission line from Powerhouse to switch

yard of Mathillo Mailung River Jalvidhyut

Aayojana (14.3 MW)

Power and Energy

Gross Head

693.50 m

Net Head at design discharge

678.02 m

Installed capacity

17.00 MW

Gross Annual Energy

101.02 GWh

Dry Energy

16.02 GWh (15.86 %)

Wet Energy

85.00 GWh (84.14 %)