def headloss_rect(FlowRate, Width, DistCenter, Length,
                  KMinor, Nu, PipeRough, openchannel):
    """Return the total head loss in a rectangular channel.

    Total head loss is a combination of the major and minor losses.
    This equation applies to both laminar and turbulent flows.
    """
    #Inputs do not need to be checked here because they are checked by
    #functions this function calls.
    return (headloss_exp_rect(FlowRate, Width, DistCenter, KMinor).magnitude
              + headloss_fric_rect(FlowRate, Width, DistCenter, Length,
                                   Nu, PipeRough, openchannel).magnitude)
Return the total head loss in a rectangular channel.

    Total head loss is a combination of the major and minor losses.
    This equation applies to both laminar and turbulent flows.