| 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 |
