Subsidiary works
4.—(1) A.B. Ports may—
(a)from time to time within the limits of deviation erect, construct and maintain all such works, conveniences, appliances and apparatus as they from time to time deem necessary or convenient for the purposes of or in connection with or incidental to, the construction, operation and maintenance of the works or the accommodation of vessels thereat;
(b)in the course of constructing, replacing, altering or reconstructing the works, carry out construction activity, including the temporary placing of plant and equipment, within the waters adjoining the limits of deviation.
(2) In this article “vessel” means every description of vessel, however propelled or moved, including a hovercraft (within the meaning of the Hovercraft Act 1968(1)), a hydrofoil vessel and anything constructed or used to carry persons or goods by water.