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MYAGDI KHOLA HYDROPOWER PROJECT (57.3 MW)

MYAGDI KHOLA HYDROPOWER PROJECT

The Myagdi River is located in Myagdi District and its source can be traced back to Mt Dhaulagiri. It flows through Myagdi district and converges with Kaligandaki River. It is a stream type river that is at an elevation of 854 meters (2,802 feet). The Myagdi Khola Hydropower Project is a Run-of-River scheme that utilizes the the flow in Myagdi Khola. It is located in Myagdi District, Dhaulagiri Zone of Western Development Region of Nepal.The headworks is located at the Kunaban/Myagdi confluence and the powerhouse is located at Jeltun Village.

The proposed project has installed capacity of 57.30 MW , design discharge of 12.50m3/sec and net head of 537.23m.

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    • 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