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    Rawa khola Hydropower Project

    DPC
    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
    • Location:Jalapa and Hanchour VDC, Khotang
    • Rated output:6528 kW