Salient Features of Ankhu Khola

Salient Features Ankhu Khola Hydropower Projects 42.9 MW

The principle features of the Ankhu Khola Hydropower Project (AKHPP) are summarized below.

Name of the project : Ankhu Khola Hydropower Project
Type : Run-of-River
Location : Ri VDC of Dhading District
Longitude : 28o04’00”N and 28o07’00”N
Latitude : 84o58’35”E and 85o01’04”E
Hydrology
Catchment area at headwork site : 427.55 km2
Mean Annual Precipitation : 1847.76 mm
Mean Annual Flow : 23.65 m3/s
Design Flood (1 in 100 years) : 666.44 m3/s
Power Development
Type of Power Generation : Run-of-river
Design Discharge (Q37%) : 23.65 m3/s
Minimum Flow : 5.04 m3/s
Full Supply Level : EL 894.16 m
Tail Water Level : EL 677.77 m
Gross Turbine Head : 216.40m
Net Turbine Head : 209.27 m
Installed Capacity : 42.9 MW
Average Annual Energy : 230.91 GWh
Annual Wet Energy : 200.13GWh
Annual Dry Energy : 30.77 GWh
Weir
Type : Ogee Shaped, Overflow Type
Length

Height

:

:

35 m

4.75 m

Crest Level of Weir : EL 894.41m
Under Sluice
Design Discharge : 133.29 m3/s
Invert level near gate : 889.65 masl
No. : 2 Nos.
Width

Height

:

:

2.5 m

5 m

Intake
Intake Type : Side Intake
No. : 4 Nos.
Size (W×D) : (3.4 × 2.3) m
Type : Surface/Hopper Shaped
Settling Criteria : 90% of ≥ 2mm
No. of Basin : 2 Nos.
Size of each Gravel Trap (L × B × D) : (17.5 × 7.8 × 4.0) m
Length of Spillway : 16.95 m
Length of Flushing Canal : 92.53 m
Flushing opening size (W×D) : (0.8 × 0.9) m
Flushing canal (W×D) : Surface/Rectangular
Approach Tunnel
Type : Underground/ Rectangular
No. : 2 Nos.
Size (W×D) : (3.0 × 2.3) m
Length : 57.50 m
Settling Basin
Type : Underground/Hopper
Settling Criteria : 90% of ≥ 0.2 mm
No. of Chamber : 2 Nos.
Size (L × W) : (116.7 × 14) m
Total Depth : 7.74 m
Inlet Transition Length : 27.75 m
Forebay Size (L×B × H) : (16.36 m x 10. M × 10.9 m)
Normal Water Level at Forebay : 893.87 masl
Spillway Length : 16.46 m
Flushing Canal after Flushing opening (W × D) : (0.9 × 1.0) m
Flushing Canal after conv. (under pressure) (W × D) : (1.75 × 1.0) m
Flushing Canal before conv. (under gravity) (W × D) : (3.5 × 1.4) m
Accelerating Tunnel
Shape : Inverted D-Shaped
Tunnel Size (W×D) : 2.0 m × 2.0 m
Length : 44 m
Type of Lining : Shotcrete, Concrete
Headrace Tunnel
Tunnel Type : Inverted D-Shaped
Tunnel Length : 5262 m
Tunnel Size (W×D) : 4.0 m × (2.0+2.0) m
Type of Lining : Shotcrete, Concrete
Surge Tank
Type : Non Spilling Type
Shape : Circular
Diameter : 10.30 m
Height : 39 m
Upsurge Elevation : 908.32 m
Down Surge Elevation : 878.56 m
Normal Water Level in Surge Tank : 890.67 m
Static Water Level in Surge Tank : 893.94 m
Penstock
Penstock Type : Surface and Underground (Steel Penstock)
Length : 420 m
Inner diameter

No. of Branches

Dia of Each Branch

:

:

:

3.2 m

3 Nos

12-32 mm

Power House
Type of Powerhouse : Semi Surface
Size (L x B x H) : 63.0 m × 20.6 m × 13.5 m
Tail Water  Level EL 677.77 m
Turbine
Turbine Type : Francis
Rated Discharge : 7.88 m3/s
Number of Turbine : 3 Nos.
Rated Output : 3 x 14.30 MW
Rated Net Head : 209.27 m
Efficiency of turbine : 92%
Generator
Number of units : 3 Nos.
Rated output : 3 × 17.87 MVA
Rated speed : 750 rpm
Rated frequency : 50 Hz
Type : Synchronous with brushless

excitation system,   water cooled

Efficiency : 97 %
Transformer
Rating : 3 × 17.87 MVA
Primary Voltage : 11 kV
Secondary Voltage : 132 kV
Frequency : 50 Hz
Efficiency of transformer : 99 %
Efficiency
Overall Efficiency Adopted : 88.3 %
Tailrace Canal
Size (B x H) : 3.8 m × 6.15/2.85 m
Length : 103.78 m
Longitudinal Slope : 1 in 1000
Tail Water Level : 677.77 masl
Transmission Line
Transmission Line : About 30 km, 132 kV single circuit to

Proposed Trishuli “3B” substation

Construction Period : 4 Years

 

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