17.—(1) The Trustees or any person authorised by them may from time to time deepen, widen, dredge, scour, cleanse, alter and improve the bed and foreshore of the harbour and the seaward approaches thereto.
(2) The Trustees may use, appropriate or dispose of any material (other than any wreck within the meaning of Part IX of the 1995 Act) from time to time dredged or removed by them from the harbour.`
(3) No dredged materials shall be 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 mean high water springs except in such places and in accordance with such conditions and restrictions as may be approved or prescribed by the Scottish Ministers.