I. GENERAL
1. LOCATION:
State : Uttar Pradesh
District : Jhansi
Tehsil : Babina
Village : Sukwan Dhukwan
River : Betwa
Access : 30km from Jhansi through road
Nearest rail head (B.G.) : Jhansi
2. GEOGRAPHICAL CO-ORDINATES:
Latitude : 25°12’E
Longitude : 78°33’N
Reference Toposheet No. : 54 K/ 12/ NW
3. DAM (Existing):
(Existing Dhukwan Dam is 2972 m long Masonary cum Earth & Rockfill Dam across river Betwa.)
Catchment Area : 21, 34, 160 Ha
Gross Capacity : 5780 MCM
Spillway Crest Level : 271.27 m
F.S.L. : 273.70 m
H.F.L. : 275.55 m
Top Level : 277.00 m
Length of Masonry Dam : 1172 m
Length of Earthen Dam : 1800 m
Submergence Area : 1943 Ha.
Maximum Height of Dam : 8.22 m
No. & Size of Spillway Gates : 383 no. (10 ft wide & 8ft high)
Design Discharge of Spillway : 15, 260 cumecs
4. HYDROLOGY:
Catchment Area at Dam Site : 8240 sq. miles (21, 24, 160 Ha)
Type of Catchment : Rugged and hilly
Rainfall : Dam is existing across river betwa and releases from reservoir are proposed to be passed through the Power House. The discharges of the river at dam site and releases from dam are available for the years 1990 to 2009.
Maximum Flood Discharge : 20,000 cumec (6.42 lacs cusecs observed in the year 1983). This is the maximum observed since 1961.
Reservoir Capacity : 2.04 T.M.C.
5. RESERVOIR:
F.R.L. : E L 273.70 m
MDDL : E L 268.30 m
Minimum Tail Water Level : E L 251.70 m
HFL in D/S of TRC : EL 258.50 m
II. PROJECT FEATURES
1. 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
2. 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
3. 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)
4. 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
5. 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
6. 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
7. 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)
8. SPILL CHANNEL:
Shape : Trapezoidal
Length : 280 m
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
9. 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
10. 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
Materials : RCC (M-25)
At Nala-1, 2 & 3
Nos. of Barrels : 01
Size : 3.5 m (W) X 3.0 m (H)
At Nala-4
Nos. of Barrels : 02
Size : 3.5 m (W) X 3.0 m (H) each
11. HYDRO-MECHANICAL WORKS:
i) Barrel Gates
a. Type of Gate Fixed wheel with upstream skin plate and upstream seals.
b. No. of bays 4 (four)
c. Clear width 4.50 m
d. Clear height of gate 5.50 m
e. Sill level 265.50 m
f. Maximum Water Level 273.70 m (FRL)
g. Design head 8.2 m
h. Type of wheel assembly Wheel mounted on corrosion resisting Steel axle with
roller bearings and having line contact with track.
i. Type of side and top seals Rubber, music note (hollow).
j. Type of bottom seal Rubber, wedge
k. Lowering/raising speed of hoist 50 cm/minute
l. Centre to centre side seals 4500+ 150 mm
m. Centre of the centre wheels/tracks 4500 + 400 mm
n. Approx weight of each gate 15 tonne
o. Approx hoist capacity for each gate 25 tonne
ii) Trashracks at Intake structure of Forebay
a. Type of trash rack Inclined
b. No. of bays 9 (nine)
c. Clear width 3.4 m
d. Total vertical height of trash rack 16.2 m
e. Sill level 258.50 m
f. Full supply level 273.00 m
g. HFL 273.0 m
h. Differential head for design 6 m
i. Approx. weight of one section of 2.5 tonne
Trash rack considering six (6)
Sections per bay
iii) Intake Gates at Forebay
a. Type of Gate Fixed wheel with downstream
skin plate and downstream seals.
b. No. of bays 3 (three)
c. Clear width 3.32 m
d. Clear height of gate 6.30 m
e. Sill level 258.50 m
f. Full Supply Level 273.00 m
g. Design head 14.5 m
h. Type of wheel assembly Wheel mounted on corrosion resisting Steel axle
with roller bearings and having line contact with track.
i. Type of side seals Teflon cladded, rubber, music note (solid).
j. Type of bottom seal Rubber, wedge
k. Lowering/raising speed of hoist 50 cm/minute
l. Centre to centre side seals 3320 + 150 mm
m. Centre of the centre wheels/tracks 3320 + 400 mm
n. Approx weight of each gate 15 tonne
o. Approx hoist capacity for each gate 30 tonne
iv) Draft Tube Gates
a. Type of gate Vertical lift, slide type downstream skin plate
and downstream sealing, non regulating type
b. No. of bays Six of clear width of 4.2 m each
c. No. of gates required Two seal gates having bottom, side & top
isolating one unit.
d. Total height of one gate 3.20 m + requirement for top seal
f. Sill level 244.0 m
g. Max. TWL 258.00 m
h. Design head 14.00 m
i. Type of side & top seals Rubber, music note (hollow)
j. Type of bottom seal Rubber, wedge
k. Lowering/raising speed of hoist 0.75 m/minute to 1.5 m/minute
l. Centre to centre side seals 4200 + 150 mm
m. Centre to centre thrust pads 4200 + 400 mm
n. Approx. weight of each gate 8 tonne
v) Automatic Tilting Gates at Spill Channel
a. Type of Gate Fish belly with upstream skin plate Automatic with counter weight
b. No. of bays 2 (two)
c. Clear width 9.5 m
d. Clear height of gate 3.2 m
e. Sill level 269.80 m
f. Maximum Water Level 273.00 m (FRL)
g. Design head 3.2 m
12. ELECTRO-MECHANICAL WORKS:
i) Characteristic of Turbine
a. Type : Kaplan (Vertical)
b. Nos. : 3
c. 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 design headf.
Turbine efficiency : 92 %
ii) Characteristic of Generators
a. Type : Three phase synchronous
b. Rated output at 0.9 pf lag and
normal rated terminal voltage : 8.88 MVA
c. Continuous overload capacity : 10%
d. Normal rated terminal voltage : 11 kV
e. Rotational speed : 187.5 rpm
f. Rated frequency : 50 Hz
g. Short circuit ratio on
rated MVA base : 1.0
h. Efficiency at 8.88 MVA,
0.9 pf lag, 50 Hz, not less than : 98%
iii) Characteristic of Generator Transformers
a. Type : Three phase
b. Rating : 9.78 MVA
c. Cooling type : ONAN/ONAF
iv) Switchyard
Voltage level : 11/132 kV
a. No. of bays : 3
b. Size : 65 m (L) x 55 m (W)
13. ANNUAL ENERGY GENERATION
At 46.53% load factor : 97.82 Million units
(As per availability of water)
14. COST ESTIMATES
(i) Total Cost : 182.53 crores
a) Civil works : 127.62 crores
b) E&M Works : 54.91 crores
(ii) IDC : 12.89 crores
(iii) Subsidy : 11.70 crores
(iv) Total Cost considering : 183.72 Crores
IDC and subsidy
(v) Cost of installation per MW : 7.65 crores
15. GENERATION COST/kW
At 46.53% load factor : Rs. 3.63
(As per availability of water)
16. RETURN ON EQUITY (pre-tax)
a. For first 10 years : 19 %
b. 11th year onwards : 24 %
17. CONSTRUCTION PERIOD : 30 months
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