Detailed Feasibility Study of Myagdi Khola Hydropower Project 57.3 MW
Completed: 100%
Client: Hydro Village Pvt.Ltd
Location: Myagdi
Duration: 1 year
Budget: Rs. 1
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Detailed Feasibility Study of Myagdi Khola Hydropower Project 57.3 MW
Detailed Feasibility Study of Myagdi Khola Hydropower Project 57.3 MW
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 : 28o 38' 00'' N to 28o 33' 20'' N
Longitude : 83o 25' 00" E to 83o 21' 50" E
2 General
Name of River : Myagdi Khola
Nearest Town : Darbang
Type of Scheme : Run-of-River (ROR)
Gross Head : 564.00 m
Net rated Head : 537.23 m
Installed Capacity : 57.30 MW
Average Annual Energy after Outage : 334.36 GWh
3 Hydrology
Catchment Area : 306 km 2
Mean Annual Discharge : 23.56 m3/s
Design Discharge (at 40%PoE) : 12.5m3/s
Riparian Release : 0.417m3/s
Design Flood Discharge : 659.46m3/s at intake 731.49m3/s at Powerhouse
Average Annual Precipitation : 2171.53mm.
4 Diversion Weir
Type of Weir : Concrete gravity structure with overflow weir section (Broad crested weir)
Length of Weir : 15.00 m
Crest Elevation : 2417.0masl
Spillway type : Ogee Shape
Under sluice Opening (W X H) : 2.50m x 3.40m
Under sluice Crest Level : 2413.30 masl
5 Intake Structure cum Gravel Trap
Type of Intake : Side intake (Orifice type)
Nos of Opening : 3 Nos
Size of Intake (W x H) : 2.80 m x 1.80 m
Intake Normal Water Level : 2417.0 masl
Length of Gravel Trap : 9.80 m
Width of Gravel Trap (Avg.) : 10.40m
Overall depth : 7.5 m
Particle size to be trapped : 4 mm
Flushing Channel : 1.00m x 1.00m (W x H)
6 Feeder Tunnel
Type : Free flow
Length : 439 m
Size (W x B) : 3.20m x 3.50m
7 Desanding Basin
Type : Hopper type
Dimension (L x B x H) : 95m x 10m x 11.21m
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
8 Headrace Tunnel
Type : D-shaped
Internal Diameter : 3.20 x 3.50 m
Length : 5644 m
Steel Thickness/Type of Lining : Concrete lining
Nos. of Anchor Blocks : 7 nos
9 Surge Tank/Forebay
Type : Surface
Effective Depth : 36 m
Diameter (Or size) : 8 m
Up Surge Level : 2429.68 masl
Down Surge Level : 2398.34 masl
Normal Operation Level : 2412.36 masl
10 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
11 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
12 Powerhouse
Type : Surface
Size (L x W) : 44.5m x 14 m
Height : 22 m
Turbine Axis Level : 1853 masl
13 Tailrace
Type : Box Culvert
Tailrace Length : 60 m
Size (W x D) : 4.5m x 2.6m (WxH)
Tailrace Water Level : 1850.0 masl
14 Turbine
Type : Pelton (Vertical axis)
Number : 3
Rated Output Capacity per unit : 19100 Kw
Turbine Axis Level : 1853 masl
Net Head : 537.23 m
Discharge per Unit : 4.17 m3/s
Efficiency : 90%
15 Governor
Type : microprocessor control
Adjustment for Speed Drop : 0-0.1%
16 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 : 96%
17 Transformer
Type : 3-phase, oil-immersed
Rated Capacity : 22.50MVA
Voltage Ratio : 132 kV/6.5
No of Units : 3 Nos
Vector Group : YNd11
Efficiency : 99%
18 Transmission Line
Voltage Level : 132 kv Single Circuit
Length : 17 KM
Conductor Type : Wolf
From : Powerhouse
To : Dada Khet S/S, Myagdi
19 Project Cost Estimate
Total Cost of the Project : NRs. 9,691,514,000.00
20 Construction Period : 3 Years