6.—(1) Without prejudice to the generality of article 18 (Power to dredge) below, the Council, for the purposes of constructing and maintaining the authorised works, may from time to time deepen, widen, dredge, scour, cleanse, alter and improve the bed of the sea and foreshore of the harbour and the approaches thereto and may blast any rock within the harbour or in such approaches.
(2) Subject to paragraph (3) below, all materials dredged up or removed by the Council in exercise of the powers of this article shall be the property of the Council and may be used, sold, deposited or otherwise disposed of as the Council think fit.
(3) No such materials shall be laid down or deposited—
(a)in contravention of the provisions of any enactment as respects the disposal of waste; or
(b)in any place below the level of high water otherwise than in such position and under such conditions and restrictions as may be approved or prescribed by the Secretary of State.