• Project Location

Development Region : Dhaulagiri

District : Myagdi

Intake site : Near Kunaban Lake

Geographical Co-ordinates

Latitude : 28° 38’ 00” N and 28° 40’ 00” N

Longitude : 83° 21’ 25” E and 83° 23’ 15” E

• General

Name of River : Kunaban Khola

Nearest Town : Beni

Type of Scheme : Run-Of-River (ROR)

Gross Head : 656 m

Net rated Head : 625.29

Installed Capacity : 20.0 MW

Average Annual Energy after Outage : 115.515 GWh

• Hydrology

Catchment Area : 76.80 km²

Mean Annual Discharge : 5.07 m³/s

Design Discharge (at Q_41.9% PoE) : 3.68 m³/s

Riparian Release : 0.115 m³/s

Design Flood Discharge : 238.49 m³/s

Average Annual Precipitation : 2407.07 mm

• Diversion Weir

Type of Weir : Broad Crested Weir

Length of Weir : 20.00 m

Crest Elevation : 3313.00 masl

Spillway type : Ogee Shaped

Undersluice Opening (W × H) : 4 × 11.23m

Undersluice Crest Level : 3109.30 masl

• Intake Structure cum

Gravel Trap

Type of Intake : side

Nos of Opening : 2 nos

Size of Intake (W × H) :  1.8 × 2.0 m

Intake Sill Level : 3110.20 m

Length of Gravel Trap : 19.0 m

Width of Gravel Trap (Avg.) : 5.5 m

Overall Depth : 10.0 m

Particle size to be trapped : 5 mm

Flushing Channel : 0.8 × 0.8m

• Desanding Basin

Type : Hopper Type, Intermittent Flushing

Dimension (L × B × H) : 40.0 × 4.8 × 5.0 m

Inlet Transition Length : 10.0 × 8.0 m

Particle Size to be settled : < 2 mm

Trapping Efficiency : 96 %

• Headpond

Type : Open Channel

Overall Depth : 7.42 m

Diameter (Or size) : 10.0 × 10.0 m

Normal Operation Level : 3205.18 m

• Headrace Tunnel

Type : D - shaped

Size : 3.0 × 3.25 m

Length : 3400 m

NWL at inlet portal : 3107 m

• Surge Shaft

Type : Underground

Overall Depth : 44m

Diameter (Or Size) : 8.0 m

Up Surge Level : 3137.16 m

Down Surge Level : 3105.72 m

Normal Operation Level : 3119.84 m

• Adit Tunnel

Size : 3.0 × 3.25 m

Length : 90 m

• Steel Penstock Pipe

Type : Steel surface type

Internal Diameter : 1.3 m

Length : 1780.0 m

Steel Thickness : 10 – 40 mm

Nos. of Anchor Blocks : 28

Nos. of Saddle Supports : 268

• Powerhouse

Type : Surface

Size (L × W) : 35 × 14 m

Height : 15 m

Turbine Axis Level : 2457.00 masl

• Tailrace

Type : Open Channel

Tailrace Length : 28.0 m

Size (W × D) : 1.2 × 1.75 m

Tailrace Water Level : 2457.00 masl 

• Turbine

Type :  Pelton, Horizontal Axis

Number :  2 nos

Rated Output Capacity per unit : 10.00 MW

Turbine Axis Level : 2457.00 masl

Net Head : 626.29 m

Discharge per unit : 1.84 m³/s

Efficiency : 91%

• Governor

Type : Electro-hydraulic

Sensitivity : 0.01%

Accuracy : 96%

• Generator

Type : Salient pole, synchronous

Capacity : 11800 KVA

Capacity @ 10% intermittent OL : 12980 KVA

Power Factor : 0.85

Generator Voltage : 11 kV

Frequency : 50 Hz

Excitation System Type : Brushless

Efficiency : 97%

Number of Poles : 8

Synchronous Speed : 750 rpm

• Transformer

Number of Transformers : Three (2 + 1 spare), Three Phase

Type : Outdoor, oil immersed

Cooling : ONAN

Rating : 13.00 MVA

Rated Voltage : 11 kV/132 kV

Maximum Voltage (Line to Line) : 12 kV/145 kV

Type of Tap Changing : Off Load on High Voltage side

Tap Changing Range : ± 10% in Steps of 2.5

Principal tapping : 132 kV

Vector Group reference : YNd11

Efficiency : 99 % 

• Transmission Line

Voltage Level :  132 kV

Length : 8.5 km

Conductor Type : ACSR WOLF Conductor

From : Powerhouse

To : Myagdi Hydropower Project Switchyard/Dada Khet substation 132 kV Busbar

• Project Cost Estimate

Total Cost of the Project : NRs. 4,186,846,479.26

• Construction Period : 4 years