code: def L_channel(Q_plant, sed_inputs=sed_dict):
      
      n_tanks = n_tanks(Q_plant, sed_inputs)
      return ((n_tanks * sed_inputs['tank']['W']) + sed_inputs['thickness_wall'] +
              ((n_tanks-1) * sed_inputs['thickness_wall']))
docs: Return the length of the inlet and exit channels for the sedimentation tank.
      Parameters
      ----------
      Q_plant : float
          Total plant flow rate
      sed_inputs : dict
          A dictionary of all of the constant inputs needed for sedimentation tank
          calculations can be found in sed.yaml
      Returns
      -------
      float
          Length of the inlet and exit channels for the sedimentation tank.
      Examples
      --------
      >>> from aide_design.play import*
      >>>