Supply/ Appproach Channel |
Shape |
Trapezoidal |
Bed width |
24.00 m |
Bed Slope |
Horizontal |
Bed level |
264.50 m |
Length |
540 m in existing reservoir |
Side Slope |
1.5 H: 1.0 V |
Reinforced Cement Concrete Barrels |
Shape |
Rectangular |
Size |
4.5 m (w) x 5.5 m (H) |
Bed Level |
265.50 m |
Length |
42 m |
No. of Barrels |
4 |
Head Race Channel |
Design Discharge |
160 cumec |
Shape |
Trapezoidal |
Bed Width |
6.00 m |
Bed Slope |
1 in 4000 |
Bed Level D/S of Barrels |
265.50 m |
Length |
1750 m |
Berm Level (1.0 m wide) |
270.00 m |
Side Slope |
1.0 H: 1.0 V upto Berm Level |
1.5 H |
1.0 V above Berm Level |
Free Board |
1.50 m |
Top Level |
275.0 m |
Depth of Flow |
8.00 m At intake |
FSL |
273.50 |
Lining Thickness |
100 mm (C.C. M-15) |
Forebay |
FSL in Forebay |
EL 273.00 m |
MDDL in Forebay |
EL 267.70 m |
Design Discharge |
160.00 cumec |
Free Board |
1.50 m |
Material |
Stone Masonary/ Cement Concrete |
Storage Capacity |
19200 cum |
Length of Forebay |
95.00 m |
Width of Forebay |
39.60 m |
Height |
16.00 m |
Top Level of Forebay |
EL 274.50 m |
Bed Level near Penstock |
EL 258.50 m |
Penstock |
Shape |
Circular |
Size (Dia.) |
4000 mm |
Nos. |
3 |
Length |
100.00 m |
Thickness |
12 mm |
Material |
Mild steel |
Design Discharge |
53.33 cumecs for each Penstock |
Intake Level at Forebay |
258.50 m |
Power House |
No. of Machines |
3 |
Type of Machines |
Kaplan |
Power House |
Surface Power House |
Head |
Gross (weighted) |
20.60 m |
Design |
17.85 m |
Size of Power House |
Length |
64.0 m |
Width |
24.0 m |
Deepest Foundation Level |
240.40 m |
Top Level of Power House |
277.00 m |
Level of Centre line of M/c |
249.70 m |
Erection Bay Floor Level |
261.5 m |
Installed Capacity |
3 x 8 MW |
Spillway at Forebay |
Crest Level of Spillway |
269.80 m |
Design Discharge |
176 cumec |
Nos. of Gate |
2 |
Pier Thickness |
2.0 m |
Size of Gate |
9.5 m (W) X 3.2 m (H) |
Spill Channel |
Shape |
Trapezoidal |
Length |
280 |
Width |
21 m |
Design Discharge |
176 cumec |
Side Slope (H: V) |
1:1 |
Bed level at D/S end |
258.00 |
Bed Slope |
1:320 |
Water Depth |
1.80 m |
Tail Race Channel |
Length |
650.0 m |
Shape |
Trapezoidal |
Discharge |
160.00 cumecs |
Bed Slope (S) |
1/1000 |
Side Slope (H: V) |
1:1 |
Bed Width |
30 m |
Bed level at D/S end |
251.00 m |
Water Depth |
2.1 m |
Cross Drainage Works
At Kappa Nala |
Nos. of Barrels |
4 Nos. |
Width of Barrels |
3.5 m |
Height of Barrels |
3.0 m |
Length of Barrels |
80 m each |
Bed Level of Barrels |
± 258.50 m |
Cross Drainage Works
At Nala-1, 2 & 3 |
Nos. of Barrels |
01 |
Size |
3.5 m (W) X 3.0 m (H) |
Cross Drainage Works
At Nala-4 |
Nos. of Barrels |
02 |
Size |
3.5 m (W) X 3.0 m (H) each |
Cross Drainage Works
At Nala-1, 2 & 3 |
Nos. of Barrels |
01 |
Size |
3.5 m (W) X 3.0 m (H) |
Hydro-mechanical Works |
Barrel Gates |
Barrel Gates |
Fixed wheel with upstream skin plate and upstream seals. |
No. of bays |
4 (four) |
Clear width |
4.50 m |
Clear height of gate |
5.50 m |
Sill level |
265.50 m |
Maximum Water Level |
273.70 m (FRL) |
Design head |
8.2 m |
Type of wheel assembly |
Wheel mounted on corrosion resisting Steel axle with
roller bearings and having line contact with track. |
Type of side and top seals |
Rubber, music note (hollow) |
Type of bottom seal |
Rubber, wedge |
Lowering/raising speed of hoist |
50 cm/minute |
Centre to centre side seals |
4500+ 150 mm |
Centre of the centre wheels/tracks |
4500 + 400 mm |
Approx weight of each gate |
4500 + 400 mm |
Approx hoist capacity for each gate 25 tonne |
4500 + 400 mm |
Trashracks at Intake structure of Forebay |
Type of trash rack |
Inclined |
No. of bays |
9 (nine) |
Clear width |
3.4 m |
Total vertical height of trash rack |
16.2 m |
Sill level |
258.50 m |
Full supply level |
273.00 m |
HFL |
273.0 m |
Differential head for design |
6 m |
Approx. weight of one section of Trash rack considering six (6) Sections per bay |
2.5 tonne |
Intake Gates at Forebay |
Type of Gate |
Fixed wheel with downstream skin plate and downstream seals |
No. of bays |
3 (three) |
Clear width |
3.32 m |
Clear height of gate |
6.30 m |
Sill level |
258.50 m |
Full Supply Level |
273.00 m |
Design head |
14.5 m |
Type of wheel assembly |
Wheel mounted on corrosion resisting Steel axle with roller bearings and having line contact with track |
Type of side seals |
Teflon cladded, rubber, music note (solid) |
Type of bottom seal |
Rubber, wedge |
Lowering/raising speed of hoist |
50 cm/minute |
Centre to centre side seals |
3320 + 150 mm |
Centre of the centre wheels/tracks |
3320 + 400 mm |
Approx weight of each gate |
15 tonne |
Approx hoist capacity for each gate |
30 tonne |
Type of trash rack |
Inclined |
Draft Tube Gates |
Type of gate |
Vertical lift, slide type downstream skin plate anddownstream sealing,non regulating type |
No. of bays |
Six of clear width of 4.2 m each |
No. of gates required |
Two seal gates having bottom, side & top isolating one unit. |
Total height of one gate |
3.20 m + requirement fortop seal |
Sill level |
244.0 m |
Max. TWL |
258.00 m |
Design head |
14.00 m |
Type of side & top seals |
Rubber, music note (hollow) |
Type of bottom seal |
Rubber, wedge |
Lowering/raising speed of hoist |
0.75 m/minute to 1.5 m/minute |
Centre to centre side seals |
4200 + 150 mm |
Centre to centre thrust pads |
4200 + 400 mm |
Approx. weight of each gate |
8 tonne |
Automatic Tilting Gates at Spill Channel |
Type of Gate |
Fish belly with upstream skin plate Automatic with counter weigh |
No. of bays |
2 (Two) |
Clear width |
9.5 m |
Clear height of gate |
3.2 m |
Sill level |
269.80 m |
Maximum Water Level |
273.00 m (FRL) |
Design head |
3.2 m |
Electro-mechanical WorksCharacteristic of Turbine |
Type |
Kaplan (Vertical) |
Nos. |
3 |
Runner dia. |
2.7 mc. |
Operating load range |
40% to 110% d. |
Permissible speed rise |
Not more than 50 %e. |
Permissible pressure rise |
Not more than 40% of designheadf. |
Turbine efficiency |
92 % |
Characteristic of Generators |
Type |
Three phase synchronous |
Rated output at 0.9 pf lag and normal rated terminal voltage |
8.88 MVA |
Continuous overload capacity |
10% |
Normal rated terminal voltage |
11 kV |
Rotational speed |
187.5 rpm |
Rated frequency |
50 Hz |
Short circuit ratio on rated MVA base |
1.0 |
Efficiency at 8.88 MVA, 0.9 pf lag, 50 Hz, not less than |
98% |
Characteristic of Generator Transformers |
Type |
Three phase |
Rating |
9.78 MVA |
Cooling type |
ONAN/ONAF |
Switchyard |
Voltage level |
11/132 kV |
No. of bays |
3 |
Size |
65 m (L) x 55 m (W) |
Annual Energy Generation |
At 46.53% load factor (As per availability of water) |
97.82 Million units |
Cost Estimates |
Total Cost |
182.53 crores |
Civil works |
127.62 crores |
E&M Works |
54.91 crores |
IDC |
12.89 crores |
Subsidy |
11.70 crores |
Total Cost considering IDC and subsidy |
183.72 Crores |
Cost of installation per MW |
7.65 crores |
Generation Cost/kw |
At 46.53% load factor (As per availability of water) |
Rs. 3.63 |
Return on Equity (Pre-tax) |
For first 10 years |
19 % |
11th year onwards |
24 % |
Construction Period |
months |
30 |