Kaligandaki Koban Hydroelectric Project

Kaligandaki ghasaAmbeshwar Engineering Hydropower Pvt. Ltd (AEHPL), a company registered under the Government of Nepal Act 2063 is set upping 180 MW Kaligandaki Koban Hydroelectric Project in Mustang District, Nepal. The project would affect Koban, Kunjo and Lete VDCs of the district. The project at a distance of 125 km from Pokhara would be built on the Kali Gandaki River. The estimated cost of the project is Rs 40 billion. The project would be constructed under financial assistance from international donor agencies. Major share holder of the company is Essar Power, India. Essar Power, amongst India’s largest power generation companies in the private sector, has a total installed generation capacity of 3,910 MW

 

Salient Features

BASELINE

RESERVOIR, STRUCTURE AND PLANT CHARACTERISTICS

PHYSICAL PARAMETERS FOR 180 MW

GENERAL Catchment AreaEstimated Specific Runoff

Mean Annual Flow

Mean Annual Yield

FSL

MDDL

Depletion

Turbine Level

Gross Head

Design Discharge

Plant Capacity

Combined Total Dead Storage

Total Live Storage

Single Turbine Capacity

Bypass Tunnel Length

Minimum Peaking Duration

3474km212l/s/km2

1.8 m3/s

1318 million m3

2530masl

2511 masl

19 m

1910 masl

620 m

35 m3/s

180 MW

4 million m3

26.2 million m3

60 MW

2.1 km

7 hours

LOWER RESERVOIR FSLMDDL

Dead Storage

Live Storage

Combined Storage Volume

Minimum Time for Continuous Reservoir Operations Without Interruptions

2530masl2511 masl

4.7 million m3

5.1 million m3

9.8 million m3

 

 

40 hours

UPPER RESERVOIR Maximum Flood Level During MonsoonMaximum Operating Level During Monsoon

MDDL

2521masl 

 

2520.5 masl

2508.1masl

FLOOD DISCHARGEDESIGN 1000 years10,00 years

PMF

1000m3/s1400m3/s

3200m3/s

MAIN CFRD DAM AT LOWER RESERVOIR Free BoardCrest Level

Crest Wall Top

Concrete Top

Foundation Level

Dam Height

3m2533masl

2534 masl

2534masl

2490 masl

44m

INTAKE AT LOWER RESERVOIR No. of Gates (Vertical)Width

Height

Nos. of Trash Racks

Trash Rack Height

Trash Rack Width

Bottom Level of Trash Rack

23m

4m

2

7m

4m

2505 masl

SPILLWAY AT LOWER RESERVOIR Spillway Crest LevelNo. of Gates Radial Type

Width

Height

2519masl2

11m

8m

SLUICEWAY AT LOWER RESERVOIR Bottom of Stop LogNo. of Gates Radial Type

Width

Height

2498masl2

4m

6m

RD DAM AT UPPER RESERVOIR (Guiding Structure) Dam TypeCrest Level

Foundation Level

Dam Height

Approx. Crest Length

Rockfill2522masl

2504 masl

18m

320m

SLUICEWAY AT UPPER RESERVOIR Sill LevelNo. of Gates Radial Type

Width

Height

Approx. Length of Bridge Deck

Bridge Deck Level

2508masl2

8m

12.5m

35m

2533 masl

LATERAL  CHANNEL WEIR AT UPPER RESERVOIR(Intake for the Bypass Tunnel) LengthSill Level

Invert Level

50m2519.8

2512 masl to 2514 masl

STILLING BASIN AT UPPER RESERVOIR(Downstream of Sluice) Approx. LengthWidth

Invert Level

40m22m

2502 masl

UNLINED HEADRACE TUNNEL TypeLining

Flow Regime

Velocity

Unlined Section

Finished Diameter

Finished Area

Total Length

U/S Invert Level

D/S Invert Level

HorseshoeShotcrete

Low Pressure

1.5m3/s

24.18 m2

5.4m

5.4m

5.5 km

2498 masl

2460 masl

CONCRETE LINED SECTION OF HRT TypeVelocity

Finished Cross Sectional Area

Finished Diameter

Total Length

Horseshoe2.5 m3/s

16.1 m2

4.2m

1.36 km

SURGE TUNNEL TypeLining

Top Level

Inclination

Diameter

Total Length

Circular80% shotcrete lined

2580 masl

1/7

5.2m

840m

PRESSURE SHAFT LiningVelocity

Section

Finished Diameter

Bottom Level

Total Length

Steel5m/s

7 m2

3m

1915 masl

545m

STEEL INLET CONDUIT&MANIFOLD VelocityNo. of Branches

Cross Sectional Area

Diameter

5.1m/s3

2.3 m2

1.71m

TAILRACE TUNNEL TypeFlow Regime

Concrete Lining in Tunnel

Velocity

Cross Sectional Area

Width

Height

Outlet Invert Level

 

Inverted D ShapedOpen Channel

30% of Total Length

1.5 m3/s

30 m2

4.6m

4.6m

1900masl

 

BYPASS TUNNEL Type 

Flow Regime

Design Discharge

Length

Maximum Velocity

Section

Approximate Slope

Tunnel Width

Tunnel Height

Invert Level U/S

Outlet Level

Drop

Inverted D Shaped and UnlinedOpen Channel

250m3/s

2.1 km

5.7m/s

43.75m2

1%

7m

7m

2508masl

2489masl

19m

 

POWER STATION Nominal Installed CapacityNo. of Power Units

Generator Floor (W*L*H)

Turbine Type

Nominal Discharge

Turbine Center Elevation

Gross Head

Rated Power Output

Rated Speed

Average Annual Production

180 MW3

15x75x30m

Pelton

11.7m3/s/unit

1910 masl

620m

180 MW

500 rpm

953.5GWh

 

TRANSFORMER CAVERN No. of TransformersType

Voltage

Area (W*L*H)

10Mono Phase

220kV

11mx64mx13m