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Cauvery Small Hydro Electric Project 24 MW
LOCATION
1 State Karnataka
2 District Mandya
3 Taluk Malavalli
4 River Cauvery
5 Latitude :  
  a) Weir 12° 17' 34"
  b) Power House 12° 18' 13"
6 Longitude :  
  a) Weir 77° 11' 09"
  b) Power House 77° 11' 22"
7 Nearest Village Nettakallu Shimshapura (11.0) km
8 Nearest Town Malavalli ( 27 km)/Maddur 54km
9 Nearest City Bangalore (150 km)
10 Nearest Air- Port Bangalore(150 km)
Purpose of the Project
1 Purpose of the Project Generation and Transmission of Hydro Electric Power
Installed Capacity
1 Installed Capacity 2 x 12000kW
Annual Energy Generation (at 75% dependabililty)
1 Annual Energy Generation (at 75% dependabililty) 102.42GWHr
Hydrology
1 Catchment Area(Cauvery Basin in Karnataka) 34,273 sq km
2 Design Power Discharge 17.23 cumecs/ Unit, at rated head
3 Maximum Power Discharge 21.07 cumecs/ Unit
4 Design Flood 2000 cumecs
5 Air Temperature  
  Maximum 40.00° C
  Minimum 17.00° C
6 Average Humidity 60 %
Diversion Weir
1 Location D/S of Bharachukki Falls.
2 Type Un-Gated, Gravity section built out of mass concrete
3 FRL El 522.00 m
4 MWL El 525.50 m
5 Top of Bridge / Non Overflow Section El 527.00 m
6 Deepest Foundation level El 512.00 m
7 Height of the weir: 10.0 m
8 Length of Overflow Section 140m
9 Length of Non Overflow Section 14.48 m
10 Total Length 154.48 m
11 Flood discharge capacity 2000 cumecs
12 Flood Lift 3.5 m
River Sluices
1 No of Vents. 1
2 Vent Size 1.00 m x1.50m
3 Sill Level 516.00m
4 Hoist Bridge Level 527.00 mx
5 Design Discharge 11 cumecs
6 Gates  
  (a) Service Gate  
  Nos. 1
  Size 1.00 m x 1.50m
  Type Vertical lift roller gate
  Hoist Screw rod hoist
  (b) Stop log Gate  
  Sets 1
  Size 1.00 m x 1.50 m
  Type Vertical lift roller gate
  Hoist Screw rod hoist
  HRT Intake  
  Nos. 1
  Sill Level EL.510.00 m
  Hoist Bridge Level EL.527.00 m
  Design Discharge / Unit 17.23 cumecs
  Gates  
  (a) Service Gate  
  Nos. 1
  Size 6.0 m x 6.0 m
  Type Vertical lift roller gate
  Hoist Rope drum Hoist, remote operation from Powerhouse
  (b) Stop log Gate  
  Size 6.0 m x 6.0 m
  Type Vertical lift roller gate
  Hoist Monorail & under slung Hoist
Head Race Tunnel
1 Dia of the tunnel 6.0
2 Shape of tunnel D shape, with CC lining, 250mm thick. Grade of Concrete: M-20, A-20
3 Length of the tunnel 1132 m
4 Sill Level at Starting 510.00 m
5 Hoist Bridge Level 527.00 m
6 Design Discharge / Unit 17.23 Cumecs
7 Slope 1 in 71
Surge Shaft
1 Type Simple
2 Diameter 11.0 m
3 Max. Surge Level EL.537.00 m
4 Min Surge Level EL.502.00 m
5 Invert level EL.493.00 m
6 Height 45.00 m
7 Wall Thickness 200 /500mm
8 Type of Wall RCC M-20, A-20
Penstock Tunnel
1 Shape D shaped
2 Size 5.00m dia
3 Flow Pressure Flow
4 Length 45.00 m
5 Steel Lining 4.5 dia, Circular shape
Penstocks
1 Type Steel Penstock, buried
2 No. of Penstock 1
3 Internal Dia. 4.5 m
4 Length 180.00 m
5 Shell Thickness 8 mm to 16 mm
6 Branch line  
  Dia 2.3 m
  Thickness 10 mm to 12 mm
  Length (Total) 82 m
Power House
1 Location Left bank of River Cauvery
2 Type Surface
3 Size of Machine Hall (outer to Outer) 15.00 m x 23.20 m
4 Size of Service Bay 15.00 m x 10.00 m
5 Size of Control room 7m x 33.20 m
6 No. of Bays 2 unit bays and one Service bay
7 No. of Units and Capacity 2 Units of 12000 kW each
8 El. Of Turbine C/L El 435.75 m
9 Generator Floor Level El 442.25 m
10 Control Room Floor Level El 442.25 m
11 Service/Equipment handling Bay Level El 442.25m
12 Draft Tube floor Level El 430.50 m
13 Max TWL El 438.00 m
14 Min TWL El 436.00 m
15 Draft Tube Gates  
  No. of Vents 2
  Size 5.00m x 2.00m
  Type Vertical Lift fixed wheel roller gate
  No. of Sets 2 with 1 elements each
  Hoisting Arrangement Gantry Crane
Tail Race Pool
1 Length 16.72 m
2 High Flood Level (River) El 438.00 m
3 Bed Width 19.5 m
4 Side Slopes 1:4 in Rock
    1:1 in Soft Rock and Soil
5 Design Discharge / unit 17.23 cumecs
6 Bed Slope 1 in 4
7 Bed Levels Varying from 431.32 m to 435.50m
Turbines
1 Type Vertical Francis
2 Rated Output 12500 kW
3 Maximum Net Head 83.98 m
4 Minimum Net Head 82.72 m
5 Rated Head 83.11 m
6 Rated Discharge per unit 16.66 cumecs
7 Maximum Discharge per unit 19.96 cumecs
8 Rated Speed 428 rpm
9 Runner Dia 1740 mm
10 Efficiency 92.00%
11 Continuous Over Load Capacity 115%
Generators
1 Type Synchronous generator
2 Rated Output 12000 kW
3 Generation Voltage 11 kV
4 Rated Speed 428 rpm
5 Efficiency-Generator 96 %
Transmission Lines
1 Length 18.00 km
2 Terminal Point 220/66 kV KPTCL sub station at Madhuvanahalli (n5e5.27ar Kollegal)
3 Type 220/66 kV with double circuit Transmission Line with COYOTE conductor.
Out Door Yard
1 Size 54.5 m x 26 m
2 No. of Power Transformers 2
Cost
1 Estimated cost of Civil Works Rs.5563.00 Lakhs
2 Estimated cost of E & M Works Rs.3840.00 Lakhs
3 Estimated cost of T –Transmission Rs.872.00 Lakhs
4 Total cost including Escalations and Interest During Construction Rs. 11794.00 Lakhs
Energy
1 Total Energy Generation (75% dependable) 102.42 GWHr
2 Saleable Energy 101.91 GWHr
3 Cost of Energy Generation (1st Year) Rs.2.63 per unit
4 Cost of Installation per kW Rs. 49,142/-
Implementation Schedule
1 Implementation Schedule 27 Months
 

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