Paragraph 13 I1

If any tidal work or any other work of which the Harbour Authority is in possession in exercise of any of the powers conferred by this Order (being in either case a work which is below mean high water level) is abandoned or falls into decay, the Conservancy Authority may by notice in writing require the Harbour Authority to take such reasonable steps as may be specified in the notice either to repair or restore the work, or any part of it, or to remove the work and (to such extent as the Conservancy Authority reasonably requires) to restore the site to its former condition.

If any tidal work is in such condition that it is, or is likely to become, a danger to or an interference with navigation in the river, the Conservancy Authority may by notice in writing require the Harbour Authority to take such reasonable steps as may be specified in the notice—

If after such reasonable period as may be specified in a notice under this paragraph the Harbour Authority has failed to begin taking steps to comply with the requirements of the notice, or after beginning has failed to make reasonably expeditious progress towards their implementation, the Conservancy Authority may carry out the works specified in the notice and any expenditure reasonably incurred by it in so doing is recoverable from the Harbour Authority.