Dudhkoshi
Power Company Pvt.Ltd
| Rawa khola Hydropower Project | |
|---|---|
| Location : | Jalapa and Hanchour VDC, Khotang |
| Installed Capacity : | 6528 kW |
| Gross head : | 85.0 m |
| Net head : | 80. 48 m |
| Type of Plant : | RoR |
| Hydrology | |
|---|---|
| River Name : | Rawa Khola |
| Catchment area : | 317.0 Km2 at intake site |
| River type : | Rain fed, Perennial River |
| Design Discharge : | 9.56 m3/s(45.4 percentile exceedance flow) |
| Design flood at intake : | 966 m3/sec (1 in 100 years) |
| Civil Works-Weir | |
|---|---|
| Type : | Free Flow Concrete Weir |
| Crest elevation of weir : | 697.00 masl |
| Length of weir : | 34.00 m |
| Height of Weir : | 3.5 m |
| Maximum flood level : | 701.80 masl |
| Intake | |
|---|---|
| Type of Intake : | Side intake |
| Crest Level of Intake : | 694.50 masl |
| Size of Orifice : | (3.85 m X 2.00 m) X 2 Nos. |
| Size of Under Sluice Gate : | (3.0 m X 4.5 m) X 2 Nos. |
| Invert Level of Under Sluice : | 692.5 m |
| Spacing of Trashrack bars : | 100 mm c/c |
| Thickness of trashrack bars : | 16 mm |
| Gravel Trap | |
|---|---|
| Length : | 14.00 m |
| Width : | 8.70 m |
| Depth(including Hooper) : | 7.75 m |
| Particle size to be settled : | ≥2 mm |
| Approach canal and Spillway | |
|---|---|
| Type : | Rectangular, RCC |
| Size : | 2.90 m x 2.5 m (up to spillway)2.90 m x 1.95 m (after spillway) |
| Length : | 110.00 m |
| Length of spillway : | 25 m |
| Settling Basin | |
|---|---|
| No of Bay : | 2 |
| Type : | Intermittent gravity flushing |
| Length of Basin : | 70.0 m (including inlet transition=17m and outlet transition=8m) |
| Width : | 6.40m |
| Depth : | 5.1 m |
| Depth of Storage : | 2.3 m |
| Particle size to be settled : | 0.2mm |
| Water Ways | |
|---|---|
| Type : | Welded steel pipe on supports and anchor blocks |
| Length of pipe : | 2392 m |
| Internal diameter of pipe : | 2.4 m |
| Longitudinal Slope : | 1 in 1000 |
| Kholsi Crossings | |
|---|---|
| Jyamire Khola : | Inverted Syphon, Length = 27.36 m |
| Juke Khola : | RCC Box Culvert (2.4 x2.4) m, Length =12 m |
| Saune Khola : | RCC Box Culvert (2.4 x2.4) m, Length =12 m |
| Forebay | |
|---|---|
| Type : | Open |
| Design Discharge : | 9.56m3/s |
| Size (L x B x H) : | (40.0 m x 6.0 m x 8 m) |
| Normal Water Level at Forebay : | 693.43 m |
| Capacity of Forebay : | 1920 m3 |
| Crest Length of Spillway : | 17 m |
| Penstock | |
|---|---|
| Type : | Steel Pipe |
| Length : | 274.0 m(including bifurcation) |
| Internal Diameter : | 2.2 m |
| Thickness : | 5-16 mm |
| Anchor Block/Saddle Supports | |
|---|---|
| No of Anchor Blocks : | 7 nos |
| Type : | Mass structure with reinf. concrete |
| No of Saddle Supports : | 21 nos. |
| Type : | Stone Masonry with Cap Concrete |
| Cap details : | RCC cap with HDPE sheet |
| Powerhouse | |
|---|---|
| Type : | Surface |
| Size : | 43 x 12 x 18 m |
| No of Units : | 2 Francis units with 3.4 MW cap on horz. setting |
| Turbine axis elevation : | 609.50 amsl |
| Depth of excavation from Existing ground : | 7.0m |
| Tailrace Canal | |
|---|---|
| Type : | Rein. Concrete Culvert |
| Size : | 2.1 X 2.1 m |
| Tailrace Level : | 606.71 m |
| Tailrace outlet : | Rawa River |
| Turbine | |
|---|---|
| Type of Turbine : | Francis |
| Number of units : | 2 Nos. |
| Rated Efficiency : | 91% |
| Axis : | Horizontal |
| Centre Line of Turbine : | 609.50 amsl |
| Generator | |
|---|---|
| Type : | AC Synchronous |
| Rating : | 3965 kVA |
| Power factor : | 0.85 |
| Rated Speed : | 750 rpm |
| Voltage : | 6.6 kV |
| Frequency : | 50 Hz |
| No of Units : | 2 |
| Excitation System : | Brushless |
| Switchyard | |
|---|---|
| Type : | Outdoor |
| Area : | 30 m x 15 m |
| Transformer | |
|---|---|
| Type : | 3 Phase, Outdoor, Oil immersed |
| No of Units : | 2 |
| Rated Capacity : | 3880 kVA |
| Voltage Ratio : | 6.6/33 kV |
| Transmission Line & Grid Connection | |
|---|---|
| Transmission line : | 33kV |
| Length : | 12 km ( approx.) |
| Grid connection : | Buipa Sub-station |
| Conductor : | ACSR Dog |
| Power | |
|---|---|
| Design Discharge : | 9.56m3/s |
| Gross Head : | 85 m |
| Rated net head : | 80.48m |
| Installed Capacity : | 6528KW |
| Overall Efficiency : | 86.49% |
| Annual Energy | |
|---|---|
| Dry season Energy : | 7.025 GWh |
| Wet Season Energy : | 31.297GWh |
| Total Energy : | 38.322 GWh |
| Project Cost | |
|---|---|
| Total Project Cost without IDC : | NRs. 1,121.25 Million |
| Interest during Construction (IDC) : | NRs. 132.39 Million |
| Cost Per kW : | NRs.2,02,803.30 /kW |
| Financing : | 70:30 (Bank Loan: Equity) |
| Loan amount : | NRs. 877.55Million |
| Promoters Equity : | NRs. 376.09 Million |
| Financial Indicators | |
|---|---|
| Debt : | Equity Ratio : 70:30 |
| Net Present Value : | NRs. 312.00 Million |
| Borrowing Interest rate : | 10.00% |
| FIRR : | 17.79% |
| B/C Ratio : | 1.267 |
| Payback period : | 10 years |