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Lambadug Hydro Electric Project 25 MW
LOCATION
1 Country India
2 State Himachal Pradesh
3 District Kangra
4 Vicinity Diversion site on Lambadug Khad about 1.5 km of Lohardi village and Power House site on right bank of Lambadug Khad near Barot (Multhan village)
5 Longitude 75º51’30” E
6 Latitude 32º05’16” N
HYDROLOGY
1 Catchment Area:  
  Lambadug Khad at diversion site 197 Sq. km
  90% dependable discharge 2.97 cumecs
  50% dependable discharge 8.1 cumecs
  Design discharge 12.75 cumecs
  Percentage availability of Design discharge 38%
  Flood discharge (100 year return period) 1450 cumecs
  Flood discharge (500 year return period) 1850 cumecs
PROJECT COMPONENTS
1 WEIR 12 Months
  Type Drop type trench weir
  Elevation +/- 2082.00 m
  Design discharge  
  Power Draft 12.75 cumecs
  Over load factor 1.28 cumecs
  Silt Flushing Discharge 2.55 cumecs
  Shingle Flushing discharge 4.46 cumecs
  Total discharge through trench weir = 21.04 cumecs
  Shingle Flushing System 1.5 x 2.25 m. Conduit with gate at Inlet chamber
  Longitudinal slope  
  Width 3.50 m
  Length 40.00 m
2 Intake Gate  
  No. 1
  Size of the gate 3.5 m x 4.0 m
  Sill level of the intake 2077.50 m
  Type of gate Vertical lift gate
  Type of hoist Mechanical chain pulley or motorized screw hoist
3 Bed load flushing sluice  
  No. 1
  Sluice size 0.75 x 1.5 m
  Length 20 m
  Size of the gate 1.5 m x 2.5 m
  Sill level of the inlet gate 2075.50 m
  Type of gate Vertical lift gate
  Type of hoist Mechanical chain pulley or motorized screw hoist
4 Approach Channel  
  Design discharge 16.50 cumecs
  Length 30 m
  Width 3.5 m
  Full supply depth 3.85 m
  Free Board 1.5 m
  Bed Slope 1/1000
  Maximum velocity 1.5 m/s
5 Desilting Arrangement  
  Min. size of the particle to be eliminated 200 µ
  Type Surface DuFour (Hopper)
  No. of units 2
  Width of each unit 6.50 m
  Length 125.00 m
  Size of the flushing tunnel /pipe  
  Max. dia near exit 0.9 m
  Min. dia at the first hopper 0.6 m
  Flushing velocity 4.00 m/s
6 Head Race Tunnel  
  Type ‘D’ shaped, concrete lined
  Size  
  Radius of crown 1.50 m
  Base width 3.00 m
  Height upto spring level 2.40 m
  Equivalent radius 3.70 m
  Length 4.15 km
  Design discharge (with 10 % over load) 14.03 cumecs
  Velocity 1.44 m/s
  No. of adits 2
  Invert level of inlet portal 2078.35 m
  Longitudinal slope 1 in 500
7 Forebay  
  Type Underground
  Max. water level 2080.5 m
  Min. water level (MDDL) 2072.05 m
  Height 7 m
  Length 500 m
  Width 5 m
  Storage capacity 17500 cum
  Sill of tunnel at exit 2068.20 m
8 Gates  
  Type Vertical gate
  No. of gates 1
  Size 2 m x 2.5 m
  Sill level 2061.5 m
  Length of transition 5.5 m
  Hoist level 2088 m
9 Penstock  
  No. of penstocks 1
  Dia. of penstock 2 m
  Thickness of steel 25 mm
  Max. velocity through the penstock 4.46 m/s
  Length of penstock 550 m
  Type Surface, single penstock bifurcating into 2 near power house
  Diameter of penstock after bifurcation 1.4 m
  Velocity 4.39 m/s
10 Power House  
  Size 40 m x 16 m
  Design power draft 12.75 cumecs
  Power draft with one unit operation 6.38 cumecs
  Max. power draft 14.03 cumecs
  Elevation + 1836.50 m
  Gross Head 244 m
  Net Head 221.71 m
  Installed capacity 25 MW (2 x 12.5 MW)
  Type of turbine Vertical Francis
  Speed 750 rpm
  Specific speed 98
  Generating units  
  Gross Energy at 90% dependability 115.64 MU
  Net Energy at 90% dependability 99.73 MU
  Gross Energy at 50% dependability 142.30 MU
  Net Energy at 50% dependability 122.73 MU
  Completed cost per MW Rs.799.00 Lakhs
  Cost per unit (Rs.) for the first year at station bus bar
90% 50%
Rs.3.81 Rs.3.09
11 Tail Race Channel  
  No. of channels 2
  Discharge through each channel 7.01 cumecs
  Length 25.00 m
  Width 3.50 m
  Side slopes Vertical
  Depth of flow 2.00 m
  Bed slope 1/1000
  Size of tail race gates 3.5 m x 2 m
  Type Stop logs
  Type of hoist Chain Pulley arrangement
 

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