code: def height_orifices(self):
          
  
          return (np.linspace(0, self.n_rows-1, self.n_rows))*self.b_rows + 0.5 * self.orifice_diameter
docs: Calculates the height of the center of each row of orifices.
          The bottom of the bottom row orifices is at the zero elevation
          point of the LFOM so that the flow goes to zero when the water height
          is at zero.