Project Location

Uttargaya Rural MunicipalityWard No. 1,

Rasuwa District (formerly Dandagaun and Haku VDCs)

District :

Rasuwa

Province No.

Bagmati

License boundary

Latitude

28°05’01”N to 28°05’56” N

Longitude

85°11’40” E to 85°12’25” E

Geology

Region

Lesser Himalaya Region

Rock composed

Augen Gneiss (dominant) and metasandstonephyllite

(minor)

Hydrology

Catchment area

72 km2 (at intake of MMKJA, 14.3 MW)

Annual mean flow

7.65 m3/sec

Design discharge

3.53 m3/sec (40% exceedance of flow)

Flood 1 in 100 years

166 m3/sec (at intake of MMKJA, 14.3 MW)

290 m3/sec (at powerhouse of MaMaKJA)

Headpond (MMKJA Tailrace

Tapping)

Tailrace Tapping

Mathillo Mailung Khola Jalvidhyut Aayojana

(MMKJA), 14.3 MW

Location

Downstream of tailrace of MMKJA

Pondage level

1550.38 m amsl

Length

17 m

Width

7.4 m

Height

7.21 m

Spillway length

4.6 m

Spillway invert level

1550.48 m amsl

Headrace Pipe

Material 

Steel

Length

 54.47 m

Internal Diameter

1.3 m

Thickness of Pipe

8 mm

Headrace Tunnel

Shape

Inverted D

Length

1463.63 m

Size, (w x h)

2.5 m x 2.8 m

Surge Shaft

Type

Vertical

Diameter

2.750 m

Length                                          

58.15 m

Up surge level                                                

1557.98 m amsl

Down surge level

1542.55 m amsl

Penstock

Material

Steel

Length

595.09 m

Type

Surface, Inclined

Internal Diameter

1.1 m

Thickness of pipe

8 mm to 30 mm (Steel grade E350)

Penstock shaft

Material

Steel

Type

Vertical and horizontal

Length

231.91 m (vertical shaft)

347.87 m (horizontal shaft before bifurcation)

39.05 m (horizontal shaft after bifurcation)

Internal diameter

1.1 m (vertical shaft)

1.1 m (horizontal shaft before bifurcation) and

0.8 m (horizontal shaft after bifurcation)

Shaft excavation

diameter

2.25 m circular for vertical shaft

Thickness of pipe

2.5 m (W) X 2.8 m (H) Inverted D shape

14 to 22 mm (Steel grade E350)

Powerhouse

Type

Surface

Length

29.13 m

Breadth

15.41 m

Height

19.62 m(from foundation to top slab)

Machine Floor level

1093.08 m amsl

Turbine

Type

Horizontal Axis Pelton turbine

Number of units

2 (Two)

Turbine Axis

1094.00 m amsl

Per unit capacity

6.8 MW

Turbine efficiency

89%

Generator

Type

Three-phase, Synchronous

Number of units

2(Two)

Rated Output

7.65 MVA

Generation Voltage

11 kV

Frequency

50 Hz

Power factor

0.85

Excitation system

Brushless

Speed

750 rpm

Generator

efficiency

95.50%

Transformer

Type

Three-Phase, oil immersed

Number of units

1 (One)

Rated Output

16 MVA

Frequency

50 Hz

Voltage ratio

11kV/132 kV

Transformer efficiency

99%

Tailrace Culvert

Type

Free flow rectangular culvert

Number

1 (One)

Length

140.46 m (considering both units)

Size (width x height)

2.4 m x 1.3 m

Bed Slope

1 in 500 and horizontal at cascade structure

Maximum Tail water level

1091.30 m amsl (at starting)

Transmission

Facilities

Transmission line

2.4 km 132 kV single circuit transmission line from

powerhouse to switch yard of MMKJA (14.3 MW)

and

11 km 132 kV single circuit transmission line from

switch yard of

Power and Energy

Gross Head

456.38 m

Net Head at design discharge

441.67 m

Installed capacity

13.00 MW

Gross Annual Energy

75.98 GWh

Dry Energy

12.16 GWh (16.01 % of total energy)

Wet Energy

63.82 GWh (83.99 % of total energy)