Salient Features

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RATLE HE PROJECT (850 MW)
(EPC Turnkey Execution)

SALIENT FEATURES OF THE PROJECT
(As per EPC Tender documents)

1. PROJECT LOCATION

State Jammu & Kashmir
District Kishtwar
River Chenab River
Location of Dam& Power House Near Drabshala Village
Latitude 33 ̊10’43” N
Longitude 75 ̊48’26” E
Nearest Airport Jammu
Nearest Railhead Udhampur

 

2. HYDROLOGY

Catchment area at Dam Site 14209 Km2
Total annual inflow in 90% dependable year 15066 MCM
Average discharge in 90% dependable year 474.36 cumec
Average annual rainfall 843 mm
Flood Discharge for River diversion 1 in 25 yr (Non monsoon) 2433.00 cumec
Flood Discharge for River diversion 1 in 25 year (Monsoon) 6729.00 cumec
Design flood (PMF) 13,814 cumec
Annual Sediment Load 21 MCM

 

3. RESERVOIR

Maximum Water Level (MWL) EL.1029.00 m
Full Reservoir Level (FRL) EL.1029.00 m
Minimum Draw down Level (MDDL) EL.1015.86 m
Gross Storage at FRL 78.71 MCM
Gross Storage at MDDL 54.85 MCM
Live Storage 23.86 MCM
Reservoir Area at FRL 2.03 sq.km.
Length of Reservoir 9.5 km

 

4. DAM

Type Concrete Gravity
Dam Top Level EL.1031.00 m
Average River Bed Level at Dam Axis EL.920.00 m
Height of Dam (Above deepest foundation level) 133.0 m
Length of Dam at top 194.80 m

 

5. SPILLWAYS

Nos & Type 1 no. Crest spillway& 5 nos. Orifice Spillways
Dam Top Level EL.1031.00 m
Design Flood (PMF) 13,814 cumec
LOWER LEVEL ORIFICE SPILLWAY
Type Orifice Spillway
Crest elevation EL.985.00 m
Gate type and Number of Gates Radial Gates, 5 nos.
Gate Opening size (W X H) 10.75 m x 14.20 m
UPPER LEVEL CREST SPILLWAY
Type Crest Spillway
Crest elevation EL.1012.50 m
Gate type and Number of Gates Radial Gates, 1 no.
Gate Opening size (W X H) 10.75 m x 16.50 m

 

6. ENERGY DISSIPATION ARRANGEMENT

Energy Dissipation system Flip Bucket type with preformed plunge pool.
Lip level of Bucket EL.970.00 m
Size of Plunge pool 106.5 m x 55.0 m
Plunge Pool Bottom EL. 903.0 m

 

7. RIVER DIVERSION ARRANGEMENT

Diversion Discharge
1 in 25 year non-monsoon Discharge 2433.0 cumec
1 in 25 year monsoon Discharge 6729.0 cumec
DIVERSION TUNNEL
No., Dia& Shape of DT 2 nos. 11.0 m Dia. circular
Length 555 m and 460 m
Inlet and outlet invert elevations EL.926.0 m and EL.924.0 m
Gate Operation Platform Elevation 993.0 m / 963.0 m
DT intake gate type and number Fixed wheel type, 2 nos. each intake
Size of diversion tunnel gates (WXH) 4.75 m x 11 m
CONSTRUCTION SLUICES
Numbers 3 nos.
Size of opening (W x H) 12.0 m x 12.5 m
Crest elevation EL.928.0 m
COFFER DAM
Upstream Coffer Dam Top Elevation EL.950.0 m
Height of upstream cofferdam + 27.0 m
Downstream Coffer Dam Top Elevation EL.935.0 m
Height of Downstream Coffer Dam + 17.0 m

 

8. POWER INTAKE

POWER INTAKE FOR MAIN POWERHOUSE
Number 4 nos
Invert elevation EL.1000.00 m
Design discharge per intake 232.03 cumec
Gate size (W x H) and Type 5.8 m x 8.4 m, Fixed Wheel type
No. and Size (W x H) of trash rack units 3 nos. 6.2 m x 23.24 m
POWER INTAKE FOR AUXILLARY POWERHOUSE
Number 1 no.
Invert elevation EL.1009.00 m
Design discharge 33.43 cumec
Gate Size (W x H) and Type 3.0 m x 3.75 m, Fixed wheel type
No. and size (Wx H) of trash rack units 1 no. 6.7 m x 14.45 m

 

9. PRESSURE SHAFT

MAIN PRESSURE SHAFTS
No. and Type of Pressure shafts 4 nos. Circular Steel Lined
Internal Diameter of pressure Shaft 6.6 m
Design discharge 232.03 cumec
Length of pressure shafts 211 m, 197 m, 184 m & 172 m
AUXILLARY PRESSURE SHAFT
No. and Type of Pressure Shafts 1 no. Circular Steel Lined
Internal Diameter of pressure Shaft 3.0 m
Design discharge 33.43 cumec
Length of pressure shaft 162 m

 

10. POWERHOUSE

Type Underground
Installed capacity 4 x 205 MW + 1 x 30 MW (Total 850 MW)
Size of Powerhouse Cavern (L x W x H) 168.0 m x 24.5 m x 49.0 m
MAIN POWERHOUSE
Turbine type Francis
Number of units 4 nos.
Turbine Centerline Elevation EL.914.30 m
Design discharge per unit 232.03 cumec
Rated head (Net) 97.37 m
Installed capacity per unit 205 MW
Main inlet valve type and Dia. Butterfly type, 6.2 m dia
Normal tail water level (All Unit Running) EL.924.23 m
Minimum tail water level (one unit Running) EL.920.19 m
Tail water level (PMF) EL.945.60 m
AUXILLARY POWERHOUSE
Type Underground
Turbine type Francis
Number of units 1 no.
Turbine Centerline elevation EL.917.00 m
Design discharge per unit 33.43 cumec
Rated head 98.90 m
Installed capacity per unit 30 MW
Main inlet valve type and Dia. Butterfly type, 2.4 m
Normal tail water level(All units running) EL.923.87 m
Minimum Tail water Level(1 unit running) EL. 923.43 m
Probable maximum tail water level EL.949.31 m

 

11. TRANSFORMER CUM GIS CAVERN

Type Underground
Cavern size (L x W x H) 142.0 m x 14.3 m x 22.0 m
Transformer Floor Level EL.926.0 m
GIS Floor Level EL.934.5 m

 

12. DOWNSTREAM SURGE CHAMBER/GOC TO DRAFT TUBE GATE

Size of Cavern (L x W x H) 116.0 m x 24.0 m x 46.4 m
No. and size (L x W x H) of each compartment of Surge chamber 4 nos, 27.0 m x 22.0 m x 45.3m
Maximum Upsurge Level EL.945.79 m
Minimum down Surge Level EL.914.28 m
Opening Area of Orifice 5.3 m dia

 

13. DRAFT TUBE GATES

No. and Type of gates 4 nos., Fixed Wheel Type
Gate Size (W x H) 6.85 m x 8.7 m
Sill elevation EL.902.5 m
Floor level of gate operation chamber EL.948.0 m

 

14. TAIL RACE TUNNELS (TRT)

FOR MAIN POWERHOUSE (4 X 205 MW)
Number, Dia and Shape 4 nos. 8.7 m (Circular)
Nominal Discharge 232.03 cumec
Length of TRT 378.6 m, 353.9 m, 334.0 m and 314.4 m
Outlet Weir Crest Elevation EL.916.40 m
Type and Size of Gate(W x H) Vertical, 6.85 m x 8.7 m
Gate Sill elevation EL.913.95 m
Gate Operation Platform Elevation EL.947.0 M
FOR AUXILLARY PLANT (30MW)
Number, Dia and Shape 1 no. , 4.7 m (circular)
Nominal Discharge 33.43 cumec
Outlet Weir Elevation EL.921.0 m
Length of TRT 290 m
Type and Size of Gate Vertical Fixed Wheel, 3.7 m x 4.7 m
Gate Sill elevation EL.921.0 m
Gate Operation Platform Elevation EL.948.5 m

 

15. POT HEAD YARD (400KVA)

Type Outdoor
Size 100.0 m x 40.0 m
Elevation EL.955.0 m

 

16. POWER GENERATION

MAIN PLANT (4 X 205 MW)
Annual energy Generation (in 90% dependable year with 95% Plant Availability) 2887.10 MU
AUXILLARY PLANT (1 X 30 MW)
Annual energy Generation (in 90% dependable year with 95% Plant Availability) 249.66 MU
Total Annual energy Generation (in 90% dependable year with 95% Plant Availability) 3136.76 MU
Annual Load Factor Around 40%

 

17. ENVIRONMENTAL FLOW

Environmental Flow (through Auxiliary Unit) 33.43 cumec

 

18. CONSTRUCTION PERIOD

Main construction period 60 months(From date of Cabinet Sanction)