code: def sep_dist_floc(ConcAluminum, ConcClay, coag, material,
                    DIM_FRACTAL, DiamTarget):
      
      return (material.Diameter
              * (np.pi/(6
                        * frac_vol_floc_initial(ConcAluminum, ConcClay,
                                                coag, material)
                        ))**(1/3)
              * (DiamTarget / material.Diameter)**(DIM_FRACTAL / 3)
              )
docs: Return separation distance as a function of floc size.