/   Sunday 19th November 2017
   

NRN Investment Limited (NRNIL) has invested in Dordi Khola Hydropower Project with an installed capacity of 27 MW in Lamjung district Nepal jointly being developed by NRN Investment Limited; promoted by NRNs around the globe and Himalayan Power Partner Limited; a company promoted by IME group.

Salient Feature

Dordi Khola Hydropower Project (27 MW)

Location

Country

Nepal

District

Lamjung

Development Region

Western

Location of Intake and Project site

Chiti VDC

Nearest Airport

Pokhara

Geographical Co-ordinates of Project Area

Longitude

84° 26’E to 84° 28’30”E

Latitude

28°10’ N to 28°13’ 32”N

Hydrology

River/Stream

Dordi-Khola

Catchment area at Diversion site

277 km2

Design Discharge

15.28 m3/s

Design Flood at diversion site (100 year return period)

614 m3/s

Design Flood at Powerhouse site (1000 year return period)

3251 m3/s

River Diversion Arrangement  
1 in 20 years dry season design flood 27.24 m3/s
Top of coffer dam at upstream El. 762.0 m
Top of coffer dam at downstream El. 756.0 m
Diversion Structure  
Type Ogee Type weir, free over flow with under sluice bays
Average river bed level El. 758.0 m
Bridge deck level El. 768.0 m
Width of diversion structure 55 m
Highest flood level El. 767.75 m
Full supply level El. 764.50 m
Weir  
Crest elevation of overflow weir El. 764.75 m
Width of overflow weir section 41.2 m
Under Sluice Bay  
No. of under sluice bays 2
Width of each bay 4.25 m
Thickness of pier 1.5 m
Crest level of under sluice bay El. 758.0 m
Clear width of under sluice bays 8.5 m
Type and height of gate Vertical gates, 3 m high.
Energy Dissipation System Hydraulic Jump Type Stilling Basin
Length of stilling basin from toe of sloping glacis 25 m
Total width of basin 49.725 m
Cistern level El. 754.0 m
End Sill Level El. 757.0 m
Intake Structure Side Intake
Type 4.75 m (W) x 4.0 m (H)
Track rack size  
Numbers of trash rack 2
Intake diversion flow (including 20% flushing discharge) 18.33 m3/s
Intake size Two bays; each 2.25 m (W) x 2.7 m (H)
Invert level of Intake El. 760.50 m
Intake stop log 1 no. Vertical lift gate (2.25 m x 2.7 m)
Intake service gate 2 nos. Vertical lift gate (2.25 m x 2.7 m)
Feeder Pipe  
Type Circular steel
Numbers 2
Size 2.25 m Dia.
Length 131.30 m & 140.10 m
Desilting Basin  
Type Hopper Type
Numbers of chambers 2 nos
Size of particles to be removed 0.2 mm and above
Dimension (L x B x H) 60 m x 8.5 m x 8.0 m
Design discharge 18.33 m3/s
Flow through velocity 0.26 m/s
Silt Flushing Pipe  
Type Circular
Dia 0.9 m
Total length 100 m
Water Conductor Pipe  
Type Steel Pipe
Size 2.65 m dia
Total length 3282 m
Head Race Tunnel (Concrete Lined)  
Type & shape Underground, D-shaped
Dia 3.3 m
Total Length 2661.67 m
Steel Lined Tunnel  
Type & shape Underground, circular
Dia 2.65 m u/s of HRT, 2.3 m d/s of HRT
Total length 25 m, 82 m respectively
Surge Shaft  
Type Restricted orifice type
Height 45 m
Dia 7 m
Orifice size 1.3 m dia, circular
Top of surge shaft El. 780.0 m
Maximum upsurge level El. 778.06 m
Minimum down surge level El. 746.39 m
   
Valve House  
Type Surface
Number 1
Size ( L x W x H) 16 m x 9.5 m x 12 m
Type of valve Buttery valve
Diameter of valve 2.3 m
Penstock  
Type Surface and Buried Penstock
Nos. One no. starting from outlet portal and trifurcating before Power House.
Diameter 2.3 m, circular shaped
Liner thickness 10 mm to 20 mm
Length 830.5 m
Length of penstock after trifurcation 163.8 m  
Branch penstock Circular, 1.3 m diameter each
Power House  
Type Surface
Gross Head 214 m
Rated Head 203.32 m
Design discharge 15.28 m3/s
Normal Tail water Level El. 552.0 m
Center line of penstock El. 550.45 m
Size of Powerhouse at machine floor 44.225 m (L) x 15.0 m (W) x 31.25 m (H)
Tail Race Channel  
Type RCC Box culvert
Length 333.66 m
Size 3.5 m x 2.5 m
Normal tail water level El. 552 m
Switchyard  
Size 30 m x 40 m
Voltage level 132 kVA
Turbine  
Turbine Type Horizontal axis Francis
Number 3
Rated Capacity of each turbine 9.3 MW
Governor  
Type Electro-Hydraulic
Generator  
Generator Type Synchronous three phase
Number 3
Rated Capacity 3 x 10590 kVA
Power Factor 0.85
Voltage 11 kV
Frequency 50 Hz
Excitation system Brushless/ static
Transformer  
Rated capacity Bank of 3 x 10.67 MVA, 11/132/√3, single phase
Voltage ratio 11 kV/ 132 kV
Transmission Line  
Voltage level 132 kV Single Circuit
Length 1.2 km
Power Generation  
Installed capacity 27 MW
Net annual energy after transmission & outage losses 142.75 GWh
   

For further Project Progress Updates Click Here

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