- Task: Feasibility study review optimization of capacity Preparation of tender documents and Detail Engineering Design
- Capacity: 12 MW
- Status: Completed
Salient features:as per Feasibility Study Report, 2008
| Location: | Namarjun and Sildujure VDC, Kaski District, Western Development Region of Nepal | ||||||
| Purpose of Project: | Electricity generation to supply for domestic use by connecting to national grid | ||||||
| Hydrology: | |||||||
| Catchment Area | 371 km2 | ||||||
| Highest point of the catchment | 7937 m (Annapurna III) | ||||||
| Long-term annual average flow | 33.51 m³/s | ||||||
| 45% Exceedance flow | 19.2 m³/s | ||||||
| 65% Exceedance, Design flow | 10.25 m³/s | ||||||
| 90 % Exceedance flow | 6.3 m³/s | ||||||
| Design Flood (Q100) | 1024 m3/s | ||||||
| Design Discharge | 23.75 m3/s | ||||||
| River Diversion During Construction: | |||||||
| Length | About 460 m long along the river channel | ||||||
| Diversion flow | 75 m3/s (1:20 years dry season flow) | ||||||
| Coffer dams | One cofferdam with control channel | ||||||
| Diversion Weir: | |||||||
| Type | Boulder lined with provision of secondary spillway | ||||||
| Downstream Slope | 1:10 (Vertical: Horizontal) | ||||||
| Crest Elevation | 1012 m above msl | ||||||
| Crest Length | 44.0 m | ||||||
| Maximum height from foundation | 7.0 m | ||||||
| Undersluice: | |||||||
| Width | 2.0 m | ||||||
| Length and slope | 85 m, 1:40 (Vertical: Horizontal) | ||||||
| Invert Elevation in front of intake | 1006.5 m above msl | ||||||
| Intake: | |||||||
| Type | Side Intake, Submerged orifice intake | ||||||
| Number of Orifices | 5 | ||||||
| Length of Orifices | 3.0 m | ||||||
| Top Elevation of Orifice | 1011.8 m above msl | ||||||
| Bottom Elevation of Orifice | 1010.05 m above msl | ||||||
| Gravel Trap: | |||||||
| Type | Conventional flushing, Single chamber | ||||||
| Top elevation | 1014.25 m above msl | ||||||
| Average Height, m | 6.80 m | ||||||
| Average Width, m | 6.98 m | ||||||
| Spillway crest elevation, m amsl | 1012.0 m amsl | ||||||
| Spillway length, m | 18.0 m | ||||||
| Settling Basin: | |||||||
| Type | Conventional flushing | ||||||
| Number of Chamber | 2 (Two) | ||||||
| Top wall elevation | 1012.5 m above msl | ||||||
| Normal Operation elevation | 1011.5 m above msl | ||||||
| Parallel Length of the basin | 110.0 m | ||||||
| Average Height | 9.50 m | ||||||
| Average Width per Chamber | 11.0 m | ||||||
| Headrace Culvert: | |||||||
| Type | RCC Rectangular | ||||||
| Longitudinal slope | 1:1500 (Vertical: Horizontal) | ||||||
| Length | 1248.0 m | ||||||
| Internal Height | 3.50 m | ||||||
| Internal Width | 4.40 m | ||||||
| Forebay: | |||||||
| Area, m2 | 2450.0 m2 | ||||||
| Height, m | 3.90 m | ||||||
| Penstock | |||||||
| Length | 144.0 m | ||||||
| Diameter/thickness, m/mm | 2.90 m dia, 10mm to 18 mm thickness | ||||||
| Power Facilities: | |||||||
| Powerhouse Type | Semi-surface | ||||||
| Gross Head from Forebay | 60.40 m (1009.4 – 949.0 m above msl) | ||||||
| Net Head | 58.42 m | ||||||
| Installed capacity, MW | 12.0 MW (2×6.0 MW) | ||||||
| Dimensions, m Length x m Width | 30.0 m x 22.0 m | ||||||
| Gross annual Energy, GWh | 69.73 GWh | ||||||
| Net annual Energy, GWh | 66.40 GWh | ||||||
| Dry season (Poush-Chaitra), GWh | 10.37 GWh | ||||||
| Wet season (Baisakh-Mangsir), GWh | 56.03 GWh | ||||||
| Tailrace Culvert: | |||||||
| Type | RCC Rectangular | ||||||
| Length | 85.0 m | ||||||
| Height | 4.0 m | ||||||
| Bottom width, m | 6.10 m | ||||||
| Longitudinal slope | 1:500 (Vertical: Horizontal) | ||||||
| Transmission Facilities: | |||||||
| Transmission line length | 18 km | ||||||
| Voltage level | 132 kV, single circuit | ||||||
Construction Supervision and Design Support During Construction
HRE III
