Salient Features of Upper Puwa I Hydropower Project

Project Salient Features

 

Location of the Project 87o52’50” E to 87o54’10” E
26o59’47” N to 27o00’50” N
Capacity 3MW
Power Development
Type of power generation Run-off-River
Net Head 149.98 m
Marketable annual energy 17.400 GWh
Dry energy 2.642 GWh
Wet energy 14.757 GWh
Weir at Thulo Puwa  
Type of weir Tyrolean type
Size of weir 11m length x 4.4m width
Weir foundation level El. 1406.50m
Gate deck level El. 1414.00m
Weir height 1.83m
Weir at Sano Puwa
Type of weir Tyrolean Type
Size of weir 9m length x 4m width
Weir Foundation Level El.1407.00m
Gate Deck Level El. 1414.00m
Weir Height 1.21m
Spillway at Thulo Puwa
Type Overflow
Crest Elevation El. 1408.50m
Width 9.0m
Flood Discharge (1:100yr.) 113 m3/s
Gravel Trap
Thulo Puwa
Section Rectangular
Size (W x H) 2.7m x 1.8m
Length 4.00m
U/S Transition Length 3.95m
Spillway Type Overflow side  spillway
Spillway Length 15.00m
Gravel Flushing Gate Size 0.50m x 0.65m(1 no)
Sano Puwa
Section Rectangular
Size (W x H) 2.6m x 1.5m
Length 3.0m
U/S Transition Length 2.89
Spillway Type Overflow side spillway
Spillway Length 9.0m
Gravel Flushing Gate Size 0.50m x 0.65m(1 no)
Water Conveyance System
Power Canal
Thulo Puwa
Section Rectangular
Size(W x H) 1.4m x 1.0m
Length 2133m
Hydraulic Slope 1:500
Sano Puwa
Section Rectangular
Size(W x H) 1.2m x 0.95m
Length 1612m
Hydraulic Slope 1:500
Desanding Basin
Thulo Puwa
Type Dufour, continuous/ intermittent flushing
Size(L x B x H) 27.5m x 4m x 2.3m
Desanding Chamber 1 no.
Particle Size to be Settled 0.25mm
Flushing Gate Size 0.50 x 0.50
Sano Puwa
Type Dufour, continuous/ intermittent flushing
Size(L x B x H) 24.0m x 3.8m x 2.0m
Desanding Chamber 1 no.
Particle Size to be Settled 0.2mm
Flushing Gate Size 0.50m x 0.50m
Common Forbay
Type Intermittent flushing
Size (L x B x H) 15.0m x 8.0m x 5.1m
Transition Length 13.6m
Particle Size to be Settled Less then 0.2mm
Spillway Type Overflow side spillway
Spillway Length 12.0m
Flushing Gate Size 0.5m x 0.5m (1 no.)
Flushing Gate Size 0.3m x 0.3m (1 no.)
Capacity 2844.4 m3
Penstock
Type Exposed
Materials Steel
Length 355.0m
Diameter 1.1m
Thickness 8mm to 16mm
Power Facilities
Power House
Type of Powerhouse Surface
Size (L x B x H)  22.50m x 15.33m x 12.34m (roof ridge)
Turbine
Type of Turbine Francis
No. of Units 2
Axis Horizontal
Rated Speed 1000 rpm
Runway Speed 1536 rpm
Generator
Type Synchronous AC 3 phase, salient poles Horizontal
Max Rated Capacity 2 x 1875 kVA
Rated Voltage 6.6 kV
Power Factor 0.8
HV side 33kv, star connected
Lv side 415V, Delta connected
Frequency 50Hz
No. of Phase 3
Transmission Line 0.9km long 33Kv single circuit connection to Puwa khola bazaar sub-station
Tailrace
Section Rectangular box canal
Size(W x H) 2.0m x 0.95m
Length 16.0m

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