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Trishuli Galchhi Hydro Electric Project 75 MW
LOCATION
1 Country Nepal
2 District Dhading/Nuwakot
3 Zone Bagmati
4 Stream Trishuli
5 River Trishuli
6 Latitude  
  Weir 27°51'14"
  Power House 27°48'26"
7 Longitude  
  Weir 85°02'13"
  Power House 84°58'20"
8 Nearest Village Dhodbesi
9 Nearest Town Trishuli Bidur (15km)
10 Nearest City Kathmandu (63 km)
11 Nearest Air- Port Kathmandu (63 km)
Purpose of the Project
1 Purpose of the Project Generation and Transmission of Hydro Electric Power
Installed Capacity
1 Installed Capacity 2 x 37.5 MW
Annual Average Energy Generation
1 Annual Average Energy Generation 468.15WHr.
Hydrology
1 Catchment Area 5731 sqkm
2 Average Annual Rainfall Nuwakot – 1913.3mm
Dhading – 21234mm
3 Average Annual Yield 8400 Mcum
4 Design Power Discharge 84.70 cumecs/ Unit, at rated head
5 Minimum Power Discharge 25.41 cumecs/ Unit, at 30% design discharge
6 Maximum design Flood (at main Weir site) 5100 cumecs
Diversion Weir
1 Location Weir across Trishuli, near Dhodbesi, in Dhading/Nuwakot District, 15km from Trishuli Bidur.
2 Type Barrage Type Structure with gates and sheet piles water sealing through the dam
3 FRL EL.445.00 m
4 MWL EL.445.00 m
5 MDDL / MOL EL.441.00m
6 Top of Overflow Section EL.447.00 m
7 Weir Crest EL.425.00 m
8 Deepest Foundation Level EL.420.50 m
9 Height of the weir (from deepest foundation level) 24.5 m
10 Length of Overflow Section 136.00 m
11 Length of Non overflow Section 222.52m
12 Total Length 391.52m
13 Flood discharge capacity of Weir 5100 cumecs
14 Energy Dissipating Arrangement Stilling Basin
15 Spillway Gates  
  i) Service Gates  
  a) Nos. 8
  b) Type Radial gate
  c) Size 12.0 m x 5.50m
  d) Sill Level EL.425.00 m
  e) Hoist platform Level EL.442.00m
  f) Hoist Type Rope drum Hoist
  ii) Stop Log Gate  
  a) Nos. 2
  b) Type Vertical Lift Gate
  c) Size 12.0 m x 6.00m
  d) Sill Level EL 425.00 m
  e) Hoist platform Level EL 447.00 m
  f) Hoist Type Gantry Crane
De-Silting Chamber Intake
1 Nos. 2
2 Sill Level EL.437.00 m
3 Hoist Bridge Level EL.447.00 m
4 Design Discharge 101.64cumecs/each compartment
5 Gates  
  (a) Service Gate  
  Nos. 2
  Size 12.00 m x 8.00 m
  Type Vertical lift roller gate
  Hoist Gantry Crane
  (b) Stop log Gate  
  Nos. 1
  Size 12.00 m x 8.00 m
  Type Vertical lift roller gate
  Hoist Type Gantry Crane
De-Silting Chamber
1 Type RCC
2 Shape Rectangular
3 Nos 2
4 Size Length 180m, Width 20m
5 Flow Free Flow
6 Depth of flow 12.7 m
Silt Flushing Arrangement
1 Gate  
  Nos. 4
  Size 9.00 m x 3.00 m
  Type Vertical lift roller gate
  Hoist Gantry Crane
HRT Intake
1 Nos. 1
2 Sill Level EL.417.834 m
3 Hoist Bridge Level EL.446.00 m
4 Design Discharge 169.4 cumecs
5 Gates  
  (a) Service Gate  
  Size 7.90 m x 7.90 m
  Type Vertical lift roller gate
  Hoist Rope drum hoist
  (b) Stop log Gate  
  Nos. 2
  Size 10.00 m x 11.00 m
  Type Vertical lift roller gate
  Hoist Rope drum hoist
Head Race Tunnel (HRT)
1 Type RCC Lined Tunnel
2 Shape Horse shoe
3 Size 7.90 m dia
4 Thickness 350mm
5 Flow Pressure Flow
6 Length 8000.00 m
7 Invert level at start EL.420.467 m
8 Invert level at end EL.396.10 m
9 Bed Gradient 1 in 328.86
Surge Shaft
1 Type Orifice
2 Diameter 30.0 m Dia
3 Max. Surge Level EL.454.50 m
4 Min Surge Level EL.408.00 m
5 Invert level EL.396.10 m
6 Height 60.9m
7 Wall Thickness 500mm
8 Type of Wall RCC M-20, A-20
Penstock Tunnel
1 Type CC lined, 350mm thick.
2 Shape Horse Shoe
3 Size 6.250 m dia
4 Flow Pressure Flow
5 Length 200.00 m
6 Bed slope 1 in 328.07
Penstocks
1 Type Steel Penstock, buried
2 No. of Penstock 1
3 Internal Dia. 6.25 m
4 Inclined Length 79.26 m
5 Shell Thickness 32, 40 mm
6 Branch line  
  Dia 4.5 m
  Thickness 28 mm
  Length (Total) 30.00 m
Power House
1 Location Just near the Prithvi Highway connecting Kathmandu-Pokhara and near Handikholagaun village
2 Type Surface type
3 Size of Machine Hall(outer to outer) 41.00 m x 22.00 m
4 Size of Service Bay 20.00 m x 22.00 m
5 Size of Control room 37.68 m x 5.5 m
6 No. of Bays 2 unit bays and one Service bay
7 No. of Units and Capacity 2 Units of 37500 kW each
8 El. Of Turbine C/L EL.382.50 m
9 Generator Floor Level EL.395.00 m
10 Control Room Floor Level EL.397.00m
11 Service/Equipment handling Bay EL 397.00 m
12 Draft tube floor Level EL 374.00 m
13 HFL HFL
14 Max. TWL (two units) EL 386.29 m
15 Min TWL EL 384.50 m
Draft Tube Gates
1 Nos. 4
2 Type Vertical Lift Gate
3 Size 6.150 m X 4.250 m
4 Sill Level EL.374.03 m
5 Hoist Level EL.397.00 m
6 Hoist Gantry Crane
Tail Race Pool
1 Length 23.910 m
2 Max. TWL (two units) EL 386.29 m
3 Bed Width 38.3 m
4 Side Slopes i ) Rock- 1(V):0.25(H)
ii ) Soil -1(V):1(H)
5 Design Discharge 169.4 cumecs
6 Bed Slope 1 in 3
7 Bed Levels Varying from EL 375.53 m to EL 383.50 m
Turbines
1 Type Vertical Francis
2 Rated Output 38660 kW
3 Maximum Net Head 58.88 m
4 Minimum Net Head 46.33 m
5 Rated Head 50.03 m
6 Rated Discharge per unit 84.70 cumecs
7 Maximum Discharge per unit 84.70 cumecs
8 Rated Speed 150 rpm
9 Runner Dia 3600 mm
10 Efficiency at rated output 93 %
Generators
1 Type Synchronous
2 Rated Output 37500 kW
3 Generation Voltage 11 kV
4 Rated Speed 150 rpm
5 Efficiency 97 %
Transmission Lines
1 Length 3. km
2 Terminal Point 132 kV substation at Galchhi
3 Type 132 kV Double Circuit Line
Out Door Yard
1 Size 74.00m x 39.5m
2 No. of Power Transformers 2
3 Capacity of Power Transformer 50 MVA
4 Step up Voltage of Transformer 132 kV
Cost
1 Estimated cost of Civil Works in NRs(000) 5142700
2 Estimated cost of E & M Works in NRs(000) 2079900
3 Estimated cost of T -Transmission in NRs(000) 95200
4 Total Project Cost in NRs(000) 9923165
Energy (PPA)
1 Total Energy Generation 468.15 GWHr
2 Salable Energy 454.10 GWHr
Implementation Schedule
1 Implementation Schedule 42 Months from Zero date
 

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