PROJECT OVERVIEW
Sangu (Sorun) Khola Hydroelectric Project is a 5.0 MW run-of-the-river (RoR) scheme located in Dolakha District, within Bigu Rural Municipality. The project is designed to generate 29.72 GWh of energy annually after accounting for consumptive use, outages, and system losses.
The scheme utilizes a 40% dependable flow of 1.88 m³/s as the design discharge, with a gross head of 325.5 m and net head of 316.86 m. Water is conveyed through approximately 4,531 m of surface-type mild steel headrace/penstock pipe (Ø 1.3 m to 1.1 m; thickness 6–20 mm) from the settling basin to the surface powerhouse.
The headworks, located at 1,595.5 masl, comprise a side intake, gravel trap, connecting canal, and settling basin. The powerhouse is situated at Sorung Bazar on the left bank of Sangu (Sorun) Khola, about 300 m upstream of its confluence with Singati Khola, a tributary of Tamakoshi River.
The project area lies between latitude 27°47’13” N to 27°48’15” N and longitude 86°04’00” E to 86°04’03” E.
Salient Features
| Project Location | Bigu and Kalinchowk Rural Municipality Dolakha |
|---|---|
| Access to Site | Charikot Bazaar is about 134 Km and Singati 39 Km ahead in way to Tamakoshi project Highway from Charikot Bazar. |
| Project Type | Run-of-the-River (RoR) Type |
| Installed Capacity | 5000 kW |
| Annual Energy Generation | 29.72 GWh |
| Design Discharge | 1.88 m3/s (Q40%) |
| Gross Head | 325.5 m |
| Rated Net Head | 316.86 m |
| Weir Type | Simple Boulder Weir |
| Length of weir | 18.5 m including Under sluice |
| Spillyway Type | Free Overflow |
| Intake | Gated submerged orifce intake with course trash rack |
| Nos. of opening | 2 |
| Connecting canal | Box type |
| Gravel trap | Continuous flushing hopper type |
| Settling basin | Double chamber, Gravity flushing type |
| Headpond | RCC tank |
| Headrace & Penstock | Surface, mild steel circular shaped |
| Powerhouse | Sub-surface type, RCC Structure |
| Turbine | Pelton (2 Units) |
| Generator | 3 Phase brushless synchronous (2 Units) |
| Transmission Line | 132 kV Double circuit, 3 phase, 50 Hz |
| Connection with grid | Singati Sub-station |