@classmethod
def from_lines(cls, lines, grid=None, active_area=None, isfr=None, model=
    None, model_length_units='undefined', minimum_reach_length=None,
    cull_flowlines_to_active_area=True, consolidate_conductance=False,
    one_reach_per_cell=False, model_name=None, **kwargs):
    """
        Create an instance of Riv from an SFRmaker.lines object.


        Parameters
        ----------
        lines : SFRmaker.lines instance :
        grid :
        active_area :
        isfr :
        model :
        model_length_units :
        minimum_reach_length :
        cull_flowlines_to_active_area :
        consolidate_conductance :
        one_reach_per_cell :
        model_name :
        kwargs :

        Returns
        -------
        riv : SFRmaker.RivData instance
        """
    raise NotImplementedError('from_lines not implemented yet.')
