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SALIENT FEATURES OF UPPER BRAHMAYANI HYDROELECTRIC PROJECT
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General
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Project NameUpper Brahmayani Hydroelectric Project
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Source River Nyamya Masal Khola
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Location Jugal Rural Municipality
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District Sindhupalchowk
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Geographical boundary 28°04"16” N to 28°06"00” N
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85°45"18” E to 85°48"00”E
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Power Development
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Type of the project Run-of-River
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Gross head 463.00 m
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Net head 444.44 m
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Installed capacity 15.15 MW
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Estimated annual energy 89.049 GWh
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Dry Energy 26.72 GWh
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Wet Energy 62.33 GWh
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Outage4%
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Overall Efficiency 86.43%
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Hydrology
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Catchment area 110.63 km²
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100 years return period flood 422 m³/s
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Design discharge(Q45) 4.1 m³/s
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Downstream Riparian release 50% of each monthly flow
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Headworks Weir
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Weir and Sluiceways
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Type of the weirBoulder Weir
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Crest length of weir 26.0 m
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Crest elevation of weir 3075.00 masl
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Height of weir 3.5 m from the river bed
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Undersluice 1 bay; 3.5 m x 3.0 m
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Intake
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Type Orifice type side intake
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No. of openings 2 Nos
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Size (W x H) 2.5 m x 1.5 m
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Invert Level 3073.20 masl
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Gravel trap
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Size (L x W x H) 1 x (9.4 m x 6.00 m x 7.14 m
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Normal Water Level 3075.20 masl
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Approach Canal
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Length66.30 m
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Size (W x H) 2.00 m x 1.45 m
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Settling basin
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TypeSurface, Intermittent Flushing
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No. of Bays2
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Size of each chamber(L x W x H) (45 m x 6.00 m x 5.7 m
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Particle size to be removed 0.15 mm
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Normal Water Level 3073.94 masl
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Size of Head Pond(L x W x H) (12 m x 12.90 m x 7.75 m
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Headrace Pipe
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Diameter1.8 m
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Length 2743.26 m
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No. of Anchor Block31
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Headrace Tunnel
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Type Inverted D-shaped, pressurized
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Size (W x H) 2.80 m x 3.0 m
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Length 1481.75 m
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Surge Shaft
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Type Underground, circular concrete
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Diameter 5.0 m
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Height 29.0 m
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Maximum Water LevelEL 3082.39 masl
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Minimum Water Level EL 3064.51 masl
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Pressure Shaft
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Type Circular
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Diameter 2.8 m
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Length 207.75 m
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Thickness 8 mm
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Penstock Pipe
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Diameter 1.20 m
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Length 890 m
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Thickness 8-28 mm (Varies)
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No. of Anchor Block12
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Powerhouse
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Type Surface
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Size (L x B x H) 31.20 m x 13.5 m x 11.90 m
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Switchyard
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Size (L x B) 30 m x 20 m
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Tailrace Tunnel
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Type Open Channel
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Length 250.00 m
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Size (W x H) 2.0 m x 1.45 m
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Turbine
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No. of turbine units 2 Nos.
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Type Horizontal, Pelton
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Rated Output 7.558 MW x 2 units
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Efficiency 90% at rated discharge
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Rated net head 444.44 m
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Rated Discharge2.05 m²/s each unit
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Governor Electro-hydraulic
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Generator
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Number of generators 2 Nos.
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Type Horizontal, 3-ø AC
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Capacity 9000 kVA each
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Efficiency 97%
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Transmission line
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Transmission voltage 132 kV single circuit line
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Length 5 km
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Feeding point to grid Brahmayani Switchyard
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Power & Energy
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Installed capacity 15.15 MW