19.—(1) For the purpose of carrying out the works the Authority may irrespective of anything in any enactment temporarily close the area of works to vessels at such places within the port as the Authority shall think appropriate.
(2) The area of works shall only be closed to vessels for such period as is reasonably required for the purposes specified in paragraph (1) of this article.
20.—(1) Before exercising the power conferred on them by article 19 (temporary closure of area of works) to close the area of works temporarily to vessels, the Authority shall display a notice of the intention to close part of the port temporarily in a visible position in the port.
(2) Any such notice shall state that the Authority intend to close the area of works temporarily to vessels and specify the date and time, which shall be a date and time not earlier than 24 hours after the time the notice is displayed, by which all vessels must be removed from the area of works.
(3) If the master of any vessel within the area of works does not remove the vessel before the date and time specified in a notice under this article, the harbour master may cause that vessel to be removed from the area of works and moored or laid in any other place where it may without injury be moored or laid and any expenditure incurred by the Authority in removing that vessel shall be recoverable from the master of that vessel.
(4) The powers conferred on the harbour master and the Authority by this article are in addition, and without prejudice, to the powers relating to the removal of vessels conferred upon them by sections 64 and 65 of the Harbours, Docks and Piers Clauses Act 1847(1).
21. If any vessel enters the area of works after the date specified in a notice under article 20 (removal of vessels from area of works) during the period of temporary closure the harbour master may direct the master of the vessel immediately to remove the vessel from the area of works, and if the master of that vessel does not immediately comply with such directions, the provisions of paragraphs (3) and (4) of article 20 shall apply to and in respect of that vessel as if the vessel had been within the area of works before the date specified in the notice.