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Project Title: Upper Mai HP

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  • Task: Feasibiliy study & Detailed Design of Headworks

  • Capacity: 10 MW

  • Status: Completed

  • Salient features (Mai Headworks arrangements- (as per Design Basis Report, 2009)):
    Location: Maimajhwa and Mabu VDC, Ilam District, Eastern Development Region of Nepal
    Hydrology:
    Average Flow 3.63 m3/s
    Design Flow 3.45 m3/s
    Design Flood 255 m3/s. (100 Years Flood)
    Diversion Weir :
    Type Concrete gravity dam
    Slope Rectangle with vertical drop
    Crest Elevation 1628 msl.
    Crest Length 12m
    Maximum Flood Level 1632.50 msl.
    Under Sluice with Radial Gate :
    Invert level 1624.00 msl.
    Size 2 m X 1.5 m
    Length 11.50 m
    Max. Discharge 100 years of Flood.
    Intake :
    Type Rectangle orifice, Semi-Frontal
    No of Orifice 3 nos.
    Size 1.5 m wide X 2 m high with 2 center piers.
    Sill Elevation 1626.00 msl.
    Design Discharge 3.45 m3/s. (During normal Flow condition)
    Gravel Trap and Spillway :
    Type Single chamber Hopper type.
    Bed Slope Drop in 1: 1 Slop after 3.4m flat length.
    Size 6.15 m long X 4 m wide X 5.50 m average height.
    Normal Water Level 1627.82 msl
    Maximum Water Level 1631.92 msl
    Top wall Level 1630.50 msl
    Gravel Flushing :
    Size of opening 1.5 m wide X 0.5 m hight.
                 Size of Flushing Gate 600 mm X 600 mm
                 No. of opening Single
    Max. Size of Particles to be Flush out 500 mm as per hydro lab report.
    Trash Canal :
                 Length of Trash canal 5.5 m
                 Size of Flap Gate opening 2.0 m wide X 2.0 m high.
    Headrace Canal :
                 Type Rectangle, closed canal.
                 Slope 1 : 500
                 Trace Rack Fine Trash rack
                 Size of canal gate 2.1 m wide X 2.0 m high.
                 Normal water Level 1627.80 msl.
                 Maximum opening of gate 2.0 m
                 Maximum Discharge 5 m3/s.
    Settling Basin :
                 No. of chambers 4 Nos.
                 Size (Parallel Section) 30 m long X 4.0 m wide X   4.12 m Avg. height.
                 Length of transition zone 22.50 m
                 Length of settling zone 30.00 m
                 Normal Water level 1627.60 msl.
                 Slope at settling zone 1 : 50 (V : H)
                 Nos. of flushing gate 4 nos.
                 Size of Flushing Gate

    Max. length of flushing canal

    1.0   m wide X 1.0 m high.

    26.75 m

    Slope of Flushing Canal 1 : 70
    Forebay and spillway :

    Spillway crest level

    1627.65 msl.
               Length of crest level

    Spillway canal size

    12.80 m

    1.5 m wide X 15.75 m length X 1.2m Avg. high.

               Design Discharge 3.14 m3/s.
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Sanima Hydro and Engineering Pvt. Ltd. has signed a contract agreement with Sanima Jum Hydropower Limited on 14th February 2024 for Construction Supervision and Design Support During Construction of Jum Khola Jalvidhyut Aayojana (56 MW). Jum Khola Jalvidhyut Aayojana is a Run-of-River (RoR) project located at Dolakha District, Bagmati Province of Nepal. Geographically,… Read More »
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