|
Description |
Description/Value |
|
Name of the Project |
Nalgad Hydropower Project |
|
District |
Jajarkot |
|
Name of the River |
Nalgad River |
|
Types of Scheme |
Storage |
|
Project Road |
25 km |
|
Geology |
|
|
Dam Site |
Dolomite with frequent intercalation of black Shale |
|
Headrace Tunnel |
Limestone, Dolomite and Shale |
|
Power station |
Sandstone |
|
Hydrology |
|
|
Catchment Area (up to Dam site) |
569 km² |
|
Average Precipitation |
2124 mm |
|
Average Monthly Flow |
28.67 m³/s |
|
Flood Discharge (1 in 20 years wet season) |
653 m³/s |
|
Flood Discharge (1 in 10,000 years wet season) |
1975 m³/s |
|
Probable Maximum Flood (PMF) |
5051 m³/s |
|
Sediment Yield |
1490 t/km²/year |
|
Diversion Tunnel |
|
|
Type, Shape |
Partially Lined, D Shaped |
|
Diversion Flow |
560 m³/s |
|
Length |
374.30m |
|
Dimension |
6 m wide by 7 m high |
|
Reservoir |
|
|
Full Supply Level (FSL) |
1580 masl |
|
Minimum Operating Level (MOL) |
1498 masl |
|
Total Storage Volume |
474 million m³ |
|
Live Storage Volume |
350 million m³ |
|
Dam |
|
|
Type of Dam |
Curved Gravity Roller Compacted Concrete |
|
Height above Foundation |
248 m |
|
Crest Elevation |
1588 masl |
|
Crest Wall Height |
1000 mm |
|
Length of Crest |
495 m |
|
Width of Crest |
10 m |
|
Environmental In-stream flow release |
0.584 m³/s |
|
Spillway |
|
|
Type |
Ogee shaped, non - gated overflow weir |
|
Design flood |
1,000 yr peak inflow 1408 m³/s 10,000 yr peak inflow 1975 m³/s PMF peak inflow 5051 m³/s |
|
Overflow Crest Elevation |
EL. 1580 masl |
|
Overflow Crest Width |
88 m |
|
Main Intake |
|
|
Type |
Bellmouth |
|
Invert Level |
1478.5 masl |
|
Intake Pipe |
1 no, 118.0m long, steel lined, circular shape |
|
Intake gates |
2 nos. 4.5 m x 3 m |
|
Stoplogs |
2 nos. 4.5 m x 3 m |
|
Headrace Tunnel |
|
|
Length |
8168.5 m |
|
Design Discharge |
78.4 m³/s |
|
Type |
Concrete lined Horse Shoe shape. |
|
Finished Diameter |
5.85 m |
|
Surge shaft |
|
|
Type |
Restricted Orifice (Diameter = 3.0 m) |
|
Height |
165.5 m |
|
Diameter |
16.0 m |
|
Max Water Level |
1601.9 masl |
|
Min Water Level |
1466.8 masl |
|
Top Level |
1603.0 masl |
|
Invert Level (of tunnel below surge shaft) |
1437.50 masl |
|
Penstock (Top Horizontal) |
|
|
Shape |
Circular |
|
Type |
Steel lined |
|
Inclination |
Horizontal (excluding curve part) |
|
Length |
84.34 m |
|
Diameter |
4 m |
|
Vertical Drop Shaft-1 |
|
|
Shape |
Circular |
|
Type |
Steel lined |
|
Inclination |
Vertical (including upper and lower curve) |
|
Height |
245.91 m |
|
Diameter |
4 m |
|
Penstock Tunnel (Horizontal Between Drop shaft-1 & 2) |
|
|
Shape |
Circular |
|
Type |
Steel lined |
|
Inclination |
Horizontal |
|
Length |
907.32 m |
|
Diameter |
4 m |
|
Vertical Drop Shaft-2 |
|
|
Shape |
Circular |
|
Type |
Steel lined |
|
Inclination |
Vertical (including upper and lower curve) |
|
Height |
338.26 m |
|
Diameter |
4 m |
|
High pressure Tunnel |
|
|
Type |
Steel lined |
|
Length |
35m |
|
Finished Diameter |
4m |
|
Power Station |
|
|
Type |
Underground |
|
Size (L x W x H) |
110.9 m x 16 m x 37.5m |
|
Tailwater Level (turbine Pit) |
867.12 masl |
|
Transformer Cavern |
|
|
Type |
Underground |
|
Size |
111.2 m x 15.2 m x 20.4 m |
|
Turbine |
|
|
Turbine axis centre line elevation |
872.00m |
|
Type and No of Units |
Vertical Axis Pelton, 4 |
|
Installed capacity |
417 MW (4 x 104.25 MW) |
|
Tailrace Tunnel |
|
|
Type, Shape |
Concrete Lined, Inverted D shaped |
|
Tail Water level at turbine pit |
867.12m |
|
Length |
520 m |
|
Excavation Size (W x H) |
7 m x 6 m |
|
Tailrace Canal (Cut and Cover) |
|
|
Shape |
Rectangular |
|
Type |
Concrete Box Culvert |
|
Length |
170 m |
|
Size (W x H) |
5.3 m x 4.3 m |
|
Tailwater Level at outlet |
862.00 masl |
|
Transmission Line |
|
|
Length |
112 km |
|
Voltage |
400 kV |
|
Circuit |
Double |
|
Interconnection Point |
Kohalpur S/S |
|
Power |
|
|
Maximum Gross Head |
708.0 m |
|
Design Net Head |
610.0 m |
|
Maximum Net Head |
692.0 m |
|
Minimum Net head |
610.0 m |
|
Design Discharge |
78.4 m3/sec |
|
Overall Efficiency |
87.80% |
|
Maximum Daily Generation |
9 equivalent hours |
|
Minimum Daily Generation |
1 equivalent hour |
|
Power Potential Studies |
|
|
Installed Capacity |
417 MW |
|
Annual Potential energy |
3655 GWh |
|
Firm Energy |
672 GWh |
|
Secondary Energy |
608 GWh |
|
Total Energy |
1280 GWh |
|
Average Annual Load Factor |
35.4% |
|
Dry Season Energy |
604.9 GWh |
|
Dry Season Load Factor |
33.4 % |
|
Probable Project Cost (with TL) |
|
|
Civil works Cost including Preliminary Works and internal site Access Roads |
923,958,924 |
|
Hydro-Mechanical Works |
65,226,370 |
|
Electro-Mechanical Works Cost |
145,245,187 |
|
Cost of Transmission Line, Substations and Switchyard |
119,271,620 |
|
Allowance for Unlisted Items and Scope Contingencies |
125,370,210 |
|
Markups (Contractor’s Insurance Program, Taxes, Custom, Escalation) |
156,439,386 |
|
Project Administration and Management |
219,985,786 |
|
GRAND TOTAL |
1,755,497,483 US$ |