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    Blocking the flow of water to build small hydroelectricity with a screw turbine
    0:15

    Blocking the flow of water to build small hydroelectricity with a screw turbine

    Blocking the flow of water to build small hydroelectricity with a screw turbine
    0:10

    Blocking the flow of water to build small hydroelectricity with a screw turbine

    Blocking the flow of water to build small hydroelectricity with a screw turbine
    0:15

    Blocking the flow of water to build small hydroelectricity with a screw turbine

    Blocking the flow of water to build small hydroelectricity with a screw turbine
    0:10

    Blocking the flow of water to build small hydroelectricity with a screw turbine

    Blocking the flow of water to build small hydroelectricity with a screw turbine
    0:10

    Blocking the flow of water to build small hydroelectricity with a screw turbine

    Blocking the flow of water to build small hydroelectricity with a screw turbine
    0:10

    Blocking the flow of water to build small hydroelectricity with a screw turbine

    Blocking the flow of water to build small hydroelectricity with a screw turbine
    0:10

    Blocking the flow of water to build small hydroelectricity with a screw turbine

    Blocking the flow of water to build small hydroelectricity with a screw turbine
    0:12

    Blocking the flow of water to build small hydroelectricity with a screw turbine

    Blocking the flow of water to build small hydroelectricity with a screw turbine
    0:13

    Blocking the flow of water to build small hydroelectricity with a screw turbine

    Blocking the flow of water to build small hydroelectricity with a screw turbine
    0:13

    Blocking the flow of water to build small hydroelectricity with a screw turbine