Project Salient Features
| Project Location | |
|---|---|
| Latitude | 28°12’’01” N to 28°59’12” N |
| Longitude | 85°10’11” E to 85°12’01” E |
| Rural Municipality | Kispang Rural Municipality (Nuwakot District) |
| Uttargaya Rural Municipality (Rasuwa District) | |
| Districts | Nuwakot and Rasuwa |
| Access Road | |
| Access to Powerhouse site from Betrawati Bazar | 3 km |
| Road from Powerhouse to Intake | 5 km |
| Project road | 1.3 km |
| Hydrology | |
| Total Area upstream of intake site (UT3A Dam site) | 4577 km2 |
| Highest point of the catchment | 7406 m (Ganesh Himalaya) |
| Long-term annual average flow | 192 m³/s |
| 40 % Exceedance flow | 111.4 m³/s |
| 90 % Exceedance flow | 36.0 m³/s |
| 1:100 years flood at Intake area | 2718 m³/s |
| 1:100 years flood at Powerhouse site | 2880 m³/s |
| Compensation flow | 4.007 m³/s |
| Design flow (71 % exceedance flow) | 51 m³/s |
| Geology | |
| Headrace intake portal area | Gneiss |
| Tunnel alignment rock type | Dominant rocks are quartzitic schist and schist with small portion of gneiss |
| Lining type in headrace tunnel | 63 % shotcrete lined and 37 % concrete lined |
| Tunnel rock mass classification | Class II to V, Good to Very poor |
| Surge tank and penstock area (rock) | Quartzite and schist, rock class III , IV and V |
| Powerhouse Area | Alluvial and colluvial deposit quartzite and schist at 30 m to 40 m depth |
| Tailrace | Alluvial deposit |
| Geological rating of the project | Fair |
| Headpond / Intake | |
| Headpond Size | 29m x 5.2 to 11.0 m x 7.35 to 14.8 m |
| Bottom level of Headpond | 714.2 m |
| Submergence depth | 11.8 m |
| Headpond / Intake | 52.3 m |
| Approach Pressure Conduit | |
| Box Culvert Size | 5.1m x 5.1 m Square and 5.1 m Diameter |
| Bottom Level Elevation | 714.9 m |
| Length of R.C.C. box culvert including 40m Concrete Covered Steel Pipe | 283.47 m |
| Headrace Tunnel | |
| Total Length (Tunnel Start point to Surge Tank) | 3,883.02 m |
| Slope | 0.28% |
| No. of Bends | 9 |
| Surge Tank | |
| Diameter | 15 m |
| Height | 43 m |
| Lining thickness | 1 m concrete |
| Minimum Surge Water Level | El 713.62 m |
| Maximum Surge Water Level | El 739.62 m |
| Sub-horizontal pressure tunnel up to penstock stop log | |
| Dimensions | 4.2 m x 4.2 m (square) |
| Length | 34 m (including transition from circular headrace tunnel to square pressure tunnel) |
| Thickness of concrete lining | 300 mm |
| Steel Lining thickness | 14 mm |
| Penstock stop log at the downstream side of the surge tank | |
| Dimensions of stop logs | 4.5 m x 4.5 m |
| Level of operating floor | 750.00 m |
| Vertical Penstock Shaft | |
| Diameter | 4.2 m (circular) |
| Length | 66.51 m (including bends) |
| Lining | 300 mm concrete |
| Steel lining thickness | 18 mm |
| Horizontal penstock shaft | |
| Diameter | 4.2 m (circular) |
| Length | 80.62 m |
| Thickness of concrete lining | 300 mm |
| Steel lining thickness | 18 mm |
| Powerhouse ( Semi-Underground) | |
| Length x width x height | 55.44 m×19.30m×32.37m |
| Center line of Turbine | El 632.81 m |
| Invert Level of Draft Tube | El 626.73 m |
| Tailrace | |
| Length | 115.06 m |
| Size of Tailrace conduit | 6.00m W x 5.0m H |
| Turbine | |
| Number of generating units | 2 |
| Turbine Type | Francis (vertical axis) |
| Rated Output | 19.3 MW |
| Weighted Guaranteed Efficiency | ≥ 92.5% |
| Speed | 375 rpm |
| Maximum Overspeed | 544 rpm |
| Transmission (132 kV) | |
| UT3B HEP power will be transmitted to Integrated Nepal Power System (Double circuit) at Trishuli 3B Hub Sub-station | 3 km |
| Switchyard | |
| Type | 132 kV AIS |
| Transformer | |
| Type | Outdoor |
| Rating | 23 MVA |
| Frequency | 50 Hz |
| Number of units | 2 |
| Guaranteed Weighted Average Efficiency | 99.23% |
| Generator | |
| Rating | 23 MVA |
| Speed | 375 rpm |
| Number of poles | 16 |
| Frequency | 50 Hz |
| Number of Units | 2 |
| Rated voltage | 11 kV |
| Guaranteed Weighted Average Efficiency | ≥ 97% |
| Power and Energy (at design discharge) | |
| Maximum Goss Head | 90 m |
| Installed capacity | 37 MW |
| Dry season energy | 134.88 GWh/year |
| Wet season energy | 157.70 GWh/year |
| Average energy | 292.58 GWh/year |