Salient Features of the project |
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General |
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| Project Name | Middle Hongu Khola-B Hydroelectric Project |
| Name of River | Hongu Khola |
| Type of Scheme | Run-of- River (RoR) |
| Nearest Town | Salleri Bazaar |
| Gross Head | 155.50m |
Location |
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| District / Province: | Solukhumbu/ Province 1 |
| VDC/ Municipality | Bung & Gudel |
| Nearest Town | Salleri Bazaar |
Project Co-ordinate |
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| Easting | 86° 48′ 26″ E to 86° 51′ 34″ E |
| Northing | 27°29′ 09″ N to 27°30′ 51″ N |
Organization |
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| Developer | Gaurishankar Power Development Pvt. Ltd. |
| Consultant | Units Engineering Consultancy Pvt Ltd |
Hydrology |
|
| Catchment area at intake site | 441 km2 |
| Catchment area at powerhouse site | 490 km2 |
| Design Discharge (Q40) | 19.30 m3/s |
| Average annual discharge | 26.66m3/s |
| Minimum Monthly Flow | 6.57m3/s |
| Maximum Monthly Flow | 45.80 m3/s |
| Minimum Environmental Release | 0.657 m3/s |
| Design flood at intake (1 in 100): | 640 m3/s |
| Design flood at powerhouse (1 in 100): | 731 m3/s |
| Construction flood in head works (1 in 20) | 27.19 m3/s |
Diversion weir |
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| Type | Ogee type concrete gravity Dam |
| Shape | Ogee Shape |
| Crest level | 1365.50m |
| Length | 25 m |
| Height | 4.0 m from the Bed level |
| Lowest River bed level | 1361.50 masl |
| Foundation Type | Alluvium |
| Water level in stilling basin for design flood | 1365.10 masl |
Diversion during construction |
|
| Construction flood | 27.19 m3/s |
| Diversion Type | Coffer dam with diversion canal. |
| Length | 50m |
Intake |
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| Type | Side Intake |
| No of Orifice | 4 no |
| Size opening | 2.70 m*2.5m clear opening |
| Top Sill level | 1364.80 masl |
| Invert Sill level | 1362.30 masl |
| Gate Type | Vertical lift fixed wheel |
| Hoisting Type | Motorized spindle hoist |
| Trash rack dimension | 2.7 X 3.65 (WXH) |
| Trash rack Opening | 100 mm |
Under Sluice |
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| No of Bays | 2 |
| Width | 2.5 m |
| Height | 3.0 m |
| Under sluice invert level | 1359.72 masl |
Gravel Trap and Gravel Flushing |
|
| Type | Conventional |
| Settling Criteria | Gravitational |
| No of Basin | 1 |
| Length | 16.5 m length |
| Width | 13.90m |
| Height | 4.0m |
| Gravel flushing System | Intermittent during monsoon |
| Flushing duct size | 1.2m (B) X 1.0m (H) |
| Length of Flushing Canal | 35.3m (1:50 Slope) |
Settling basin |
|
| Type | Conventional |
| Settling Criteria | Gravitational |
| Settling design temperature | 10 degree Celsius |
| Settling efficiency | 85% |
| No of bays | 2.00 nos. |
| Nominal size to be settled | 0.20 mm |
| Inlet transition length | 24.6m |
| Uniform Length | 70.50 m |
| Width | 2 units of 12.60m each |
| Depth | 5.6-7.8m |
| Flushing System | Conventional Gravity |
| Size of flushing channel | 4 units of 0.8×0.8m (BXH) |
| Longitudinal Slope | 1 in 50 |
Headrace Pipe |
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| Type | Circular |
| Length | 47 m |
| Diameter | 3 m |
| Slope | varies |
| Pipe thickness | 12 mm |
Headrace Tunnel |
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| Type | Inverted D |
| Length | 3850 m |
| Size (Finished) | 4.0 m (W) X 4.2 m (H) m |
| Inlet Invert Level | 1354.05 masl |
| Outlet Invert level | 1344.00masl |
| Support Type | Shotcrete and concrete lining |
Surge Tank |
|
| Type | Circular |
| Height | 32.0 m |
| Diameter | 9.0 m |
| Upsurge Level | 1376.12masl |
| Down surge level | 1352.05 masl |
| Invert level | 1345.77 masl |
Penstock Pipe |
|
| Material | mild steel |
| Length | 770.0m |
| Size/Diameter | 2.6 m, 2.5 m, and 2.4 m |
| Thickness | Varies from 12 mm to 22mm |
| Maximum Surge pressure | 40% |
| No of Anchor Block | 11 |
Powerhouse |
|
| Type | Surface |
| Length and width | 44.0 m x 11.0 m |
| Height | 16.5m |
| Machine Floor Level | 1210.60 masl |
| Service Bay Level | 1215.10 masl |
| Overhead hoisting Type | EOT Crane |
| Overhead hoisting Capacity | 35 Ton |
| Foundation Type | Alluvial |
Tailrace |
|
| Type | Concrete, Closed |
| No | 1 |
| Length of Tailrace canal | 30 m |
| Size | 3.4 X 2.5m (BXD) |
| Tailwater Level | 1210.00 masl |
Turbine |
|
| Type | Francis Turbine (Horizontal Axis) |
| No of units | 3 |
| Maximum head | 154.24 m |
| Minimum head | 144.38 m |
| Rated net head | 144.38 m |
| Rated output Capacity per unit | 8.2 MW |
| Discharge per unit | 6.433m3/s |
| Turbine Axis level | 1212.52 masl |
| Turbine Efficiency | 90% |
Governer |
|
| Type | Digital electronic with PID type |
| Adjustment for speed drop | Adjustable to any degree between zero and 10 % |
Generator |
|
| Type | Cylindrical Pole, Synchronous, 3 Phase |
| No of Units | 3 |
| Rated Capacity | 9175 kVA |
| Excitation | Brushless Excitation |
| Rated Efficiency | 95% |
| Power factor | 0.85 |
| Frequency | 50HZ |
| Generation voltage | 11 kV |
| Speed | 500 rpm |
Power Transformer |
|
| No of Units | 3 + 1 spare |
| Type | Single phase, oil immersed out door |
| Rated Capacity | 9175 KVA |
| Frequency | 50 Hz |
| Voltage ratio | 132/11 kV |
| Efficiency | 99% |
Transmission Line |
|
| Voltage Level | 133 kV single circuit line |
| Length | Approximate 20Km |
| From | Power house |
| To | Tingla Sub-station |
| Conductor | ACSR Wolf |
Power and Energy |
|
| Installed Capacity | 22.90 MW |
| Gross Head | 155.50m |
| Net Head | 144.38m |
| Dry season Energy | 40.71 GWh (after Outage) |
| Wet season Energy | 93.17 GWh (after Outage) |
| Total Annual Energy | 133.88 GWh |
Financial Parameter |
|
| Project Cost in N.R.s (including IDC) | |
| Interest Rate | 11% |
| PIRR | 15.40% |
| B/C | 1.51 |
| NPV (NRs, 000000) | 1,812.98 |
| Debt equity ratio | 70:30 |
| RoE | N.R.s. 21.97 % |
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