• Project Location 

Development Region : Dhaulagiri

Zone : Gandaki

District : Myagdi

Intake site : Dovan just downstream from the confluence of Kunaban Khola and Myagdi Khola

Powerhouse Site : Jeltun Village

Geographical Co-ordinates

Latitude : 28° 38’ 00” N to 28° 33’ 20” N

Longitude : 83° 25’ 00” E to 83° 21’ 50” E

• General

Name of River : Myagdi Khola

Nearest Town : Darbang

Type of Scheme : Run-Of-River (ROR)

Gross Head : 564.00 m

Net rated Head : 537.62 m

Installed Capacity : 57.30 MW

Average Annual Energy after Outage : 335.993 GWh

• Hydrology

Catchment Area : 306 km²

Mean Annual Discharge : 23.56 m³/s

Design Discharge (at 41% PoE) : 12.5 m³/s

Riparian Release : 0.436 m³/s

Design Flood Discharge : 659.46 m³/s at intake 731.49 m³/s at Powerhouse

Average Annual Precipitation : 2171.53 mm

• Diversion Weir

Type of Weir : Concrete gravity structure with overflow weir section (Broad crested weir)

Length of Weir : 15.00 m

Crest Elevation : 2417.0 masl

Spillway type : Ogee Shaped

Under sluice Opening (W × H) : 2.50m × 3.40m

Under sluice Crest Level : 2413.3 masl

• Intake Structure cum

Gravel Trap

Type of Intake : Side intake (Orifice type)

Nos of Opening : 3 nos

Size of Intake (W × H) :  2.80 m × 1.80 m

Intake Normal Water Level : 2417.0 masl

Length of Gravel Trap : 9.80 m

Width of Gravel Trap (Avg.) : 10.40 m

Overall Depth : 7.5 m

Particle size to be trapped : 4 mm

Flushing Channel (W × H) : 1.00 m × 1.00m

• Feeder Tunnel

Type : Free flow

Length : 439 m

Size (W × H) : 3.20m × 3.50m

• Desanding Basin

Type : Hopper Type

Dimension (L × B × H) : 95m × 10m × 11.21 m

Inlet Transition Length : 22.10 m

Particle Size to be settled : 0.15 mm

Trapping Efficiency : 100% based on Camp’s theory and 87.42% based on Vetter’s theory

• Headrace Tunnel

Type : D - shaped

Internal Diameter : 3.20 × 3.50 m

Length : 5664 m

Steel Thickness/Type of Lining : Concrete lining

Nos. of Anchor Blocks : 7 nos

• Surge Tank/Forebay

Type : Surface

Effective Depth : 36m

Diameter (Or Size) : 8 m

Up Surge Level : 2429.68 masl

Down Surge Level : 2398.34 masl

Normal Operation Level : 2412.36 masl

• Steel Penstock Pipe

Type : Surface and subsurface: mild steel

Internal Diameter : 1.8 m to 2.0 m

Length : 1069m up to bifurcation 45 m after bifurcation

Steel Thickness : 12 to 42 mm

Nos. of Anchor Blocks : 7 nos

Nos. of Saddle Supports : 36 nos

• Vertical Shaft

No of shafts : 2 nos

Length of shaft : Shaft- 1 = 141 m, Shaft – 2=238 m

Size : 3.5 m dia of each

• Powerhouse

Type : Surface

Size (L × W) : 44.5m × 14 m

Height : 22 m

Turbine Axis Level : 1853

• Tailrace

Type : Box Culvert

Tailrace Length : 60 m

Size (W × D) : 4.5m × 2.6m (W×H)

Tailrace Water Level : 1850.00 masl

• Turbine

Type :  Pelton

Number :  3

Rated Output Capacity per unit : 19900 kW

Turbine Axis Level : 1853 masl

Net Head : 537.62 m

Discharge per unit : 4.17 m³/s

Efficiency : 91%

• Governor

Type : Microprocessor control

Adjustment for Speed Droop : 0-10%

• Generator

Type : Synchronous, 3-phase

Rated Output Capacity per Unit : 22.50 MVA

Power Factor : 0.85 (lagging)

Voltage : 11 Kv

Frequency : 50 Hz

No. of Units : 3 Nos

Excitation System : Static excitation System

Efficiency : 97%

• Transformer

Type : 3-phase, oil-immersed

Rated Capacity : 22.50 MVA

Voltage Ratio : 132/11 kV

No. of Units : 3 Nos

Vector Group : YNd11

Efficiency : 99%

• Transmission Line

Voltage Level :  132 kV Double Circut

Length : 17 KM

Conductor Type : ACSR BEAR

From : Powerhouse

To : Proposed Dadakhet S/S, Myagdi

• Project Cost Estimate

Total Cost of the Project : NRs. 9,691,514,000.00

• Construction Period : 4 years