17.—(1) A tidal work shall not be constructed, altered or replaced except in accordance with plans and sections approved by the Secretary of State and subject to any conditions and restrictions imposed by him before the work is begun.
(2) If a tidal work is constructed, altered, replaced or re-laid in contravention of this article or of any condition or restriction imposed under this article—
(a)the Secretary of State may by notice in writing require the Council at its own expense to remove the tidal work or any part thereof and restore the site thereof to its former condition; and if, on the expiration of a period of 30 days from the date on which the notice is served, it has failed to comply with the requirements of the notice, the Secretary of State may execute the works specified in the notice; or
(b)if it appears to the Secretary of State urgently necessary so to do, he may remove the tidal work, or part of it, and restore the site to its former condition,
and any expenditure incurred by the Secretary of State in so doing shall be recoverable from the Council.
18.—(1) The Council shall at or near a tidal work during the whole time of the construction, alteration or replacement thereof, exhibit every night from sunset to sunrise such lights, if any, and take such other steps for the prevention of danger to navigation as the Secretary of State shall from time to time direct.
(2) If the Council fails to comply with any requirement of a direction reasonably given under paragraph (1), it shall be guilty of an offence and liable on summary conviction to a fine not exceeding level 3 on the standard scale.
19.—(1) In the case of injury to, or destruction or decay of, a tidal work or any part thereof the Council shall as soon as reasonably practicable notify Trinity House and shall lay down such buoys, exhibit such lights and take such other steps for preventing danger to navigation as Trinity House may from time to time direct.
(2) If the Council fails to notify Trinity House as required by paragraph (1) or to comply with any requirement of a direction under it, the Council shall be guilty of an offence and liable on summary conviction to a fine not exceeding level 3 on the standard scale.
20.—(1) Where a tidal work is abandoned, or suffered to fall into decay, the Secretary of State may by notice in writing require the Council at its own expense either to repair and restore the work or any part thereof, or to remove the work and restore the site thereof to its former condition, to such an extent and within such limits as the Secretary of State thinks fit.
(2) Where—
(a)a work consisting partly of a tidal work and partly of works on or over land above the level of high water is abandoned or suffered to fall into decay; and
(b)that part of the work on or over land above the level of high water is in such a condition as to interfere, or to cause reasonable apprehension that it may interfere, with the right of navigation or other public rights over the foreshore,
the Secretary of State may include that part of the work, or any portion thereof, in any notice under paragraph (1).
(3) If, on the expiration of a period of 30 days from the date on which a notice under this article is served, the Council has failed to comply with the requirements of the notice, the Secretary of State may execute the work specified in the notice and any expenditure incurred by him in so doing shall be recoverable from the Council.
21. If he deems it expedient, the Secretary of State may at any time order a survey and examination of a tidal work or of the site upon which it is proposed to construct the tidal work, and any expenditure reasonably incurred by him in relation to any such survey and examination shall be recoverable from the Council.
22.—(1) After the completion of a tidal work the Council shall at the outer extremity thereof exhibit every night from sunset to sunrise such lights, if any, and take such other steps, if any, for the prevention of danger to navigation as Trinity House may from time to time direct.
(2) If the Council fails to comply in any respect with a direction reasonably given under this article, it shall be guilty of an offence and liable on summary conviction to a fine not exceeding level 3 on the standard scale.