Subject to subsection (2) below, the restriction on abstraction shall not apply to any transfer, without intervening use, of water from inland waters described in the first column of the Table below to inland waters described in the corresponding entry in the second column, if the transfer is in the course of, or results 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.
Subsection (1) above shall not apply to a transfer of water from a water system to any inland waters outside that water system in order to—
The restriction on impounding works shall not apply to—
in the course of the performance by a navigation authority, harbour authority or conservancy authority of their functions as such an authority, unless the construction, alteration, obstruction or impeding affects any inland waters in relation to which the authority does not have functions.
In this section, references to—
For the purposes of this section, "water system" means the canals, the harbours, or the canals and harbours constituting the system in question—