Simbuwa Khola
Simbuwa Khola Hydroelectric Project is proposed to be developed in Tapethok VDC of Taplejung district of Nepal, utilizing the flow of Simbuwa Khola, a tributary of Arun River. The scheme is 70.34 MW Run-of-Rive type hydropower project with a gross head of 888.6 m and design discharge of 9.24 cumec at 40% flow exceedance level. The major structures of the project are the spillway weir, undersluice and appurtenant structures, approach canal, desanding basin, a headrace tunnel of 4.392 km length, which will lead to a 24.22m high surge shaft. The design flow will be directed towards the powerhouse through 2710.42 m pressure shaft. The annual energy generation from the project will be 378.96 GWh and the electricity generated will be evacuated through the Koshi Corridor.
| Salient Features of Simbuwa Khola Hydroelectric Project as per Final Feasibility Report | ||
| General | Name of the river | Simbuwa Khola |
| Type of Project | Run -of- river | |
| Project Location | Yasang Village, Tamewa Village, Faktanglung, Rural Municipality | |
| District | Taplejung | |
| Development Regions | Eastern Development region | |
| Headwork site | Near Yasang Village | |
| Latitude | 27° 30' 42'' N | |
| Longitude | 87° 51' 39'' E | |
| Power house | Near Tamewa village | |
| Nearest Airport | Suketar Airport | |
| Nearest Town | Phungling bazar | |
| Hydrology | Catchment Area | 246 km2 |
| Average Annual Rainfall | 2220.16 mm | |
| Annual Average Flow | 14.76 Cumec | |
| Minimum Monthly Flow | 2.69Cumec | |
| Design Flood (100 yrs.) | 237.54Cumec | |
| Diversion Weir | Type | Broad Crested weir |
| Crest Level | EL 2335.0 m | |
| Length | 17 m | |
| Height | 5.0 m from river bed | |
| Under Sluice | Location | At left side of the Weir |
| Size | 3.0 m (W) X 5.0 m (H) | |
| Intake | Location | Immediately upstream and adjacent to the Under Sluice |
| Type | Side Intake, Orifice type (RCC) | |
| Number, Length &Height | 2 No., 3.2m x 2.5 m | |
| Diversion Discharge | 9.24 cumec | |
| Desanding Basin | Type | Single chamber Hopper type |
| No. of Bays | 2 | |
| Size | Hydraulic Size=80.0 m (L) X 9.0 (W) X 3.2m (H), H=13.07m including storage and operation clearance | |
| Headrace Tunnel | Shape | Inverted D-Shape |
| Slope | 1:1000 | |
| Size | 3.2 m dia. | |
| Length | 4392.69 m | |
| Surge Shaft | Type | Simple Cylindrical |
| Size | 7.0 m dia, 24.22 m Height | |
| Pressure Shaft | Size | 2m Circular shaped vertical shaft |
| 3.2m Inverted D-shaped Benching | ||
| Length | 2710.42 m | |
| Penstock | Size | 1.8 m penstock dia |
| Powerhouse Cavern | Location | Left bank of Tamor river |
| Type | Underground | |
| Installed Capacity | 70.34 MW | |
| Type of Turbine | Pelton | |
| Turbine central line | EL 1446.14 m | |
| Size | 102.37m (L) x 14.5m (W) x 31.75m (H) | |
| Gross head | 888.86 m | |
| Design Discharge | 9.24 cumec | |
| Tailrace Tunnel | Number & Type | 1No., Concrete Lined |
| Dia. & Space | 3.2 m, Inverted D-shape | |
| Length | 422.9 m | |
| Transmission Line | Length | 35.44 km |
| Voltage | 132.0 kV Single circuit | |
| Interconnection Point | Power House to Dhunge Sangu Sub station | |
| Power And Energy | Installed Capacity (Q40) | 70.3 MW |
| Annual Sellable Energy | 378.96 GWh | |
| Project Road | 29 km | |
| Construction Period | 4 years | |
For more information;
https://srhl.org.np