The restriction on abstraction shall not apply to any transfer of water from one area of inland waters to another in the course of, or resulting from, any operations carried out by a navigation authority, harbour authority or conservancy authority in the carrying out of their functions as such an authority.

The restriction on impounding works shall not apply to the construction or alteration of impounding works in the course of the performance by a navigation authority, harbour authority or conservancy authority of their functions as such an authority.