22.—(1) Subject to sub-paragraph (2), any specified work, and all protective works required by the drainage authority under paragraph 21, must be constructed—E+W
(a)without unreasonable delay in accordance with the plans approved or deemed to have been approved or settled under this Part of this Schedule; and
(b)to the reasonable satisfaction of the drainage authority,
and an officer of the drainage authority is entitled to watch and inspect the construction of such works.
(2) The undertaker must give to the drainage authority—
(a)not less than 14 days' notice in writing of its intention to commence construction of any specified work; and
(b)notice in writing of its completion not later than 7 days after the date of completion.
(3) If the drainage authority reasonably requires, the undertaker must construct all or part of the protective works so that they are in place before the construction of the specified work.
(4) If any part of a specified work or any protective work required by the drainage authority is constructed otherwise than in accordance with the requirements of this Part of this Schedule, the drainage authority may by notice in writing require the undertaker at the undertaker's expense to comply with the requirements of this Part of this Schedule or (if the undertaker so elects and the drainage authority in writing consents, such consent not to be unreasonably withheld or delayed) to remove, alter or pull down the work and, where removal is agreed, to restore the site to its former condition to such extent and within such limits as the drainage authority reasonably requires.
(5) Subject to sub-paragraph (6), if within a reasonable period, being not less than 28 days from the date when a notice under sub-paragraph (4) is served on the undertaker, the undertaker has failed to begin taking steps to comply with the requirements of the notice and subsequently to make reasonably expeditious progress towards their implementation, the drainage authority may execute the works specified in the notice and any expenditure incurred by it in so doing is recoverable from the undertaker.
(6) In the event of any dispute as to whether sub-paragraph (4) is properly applicable to any work in respect of which notice has been served under that sub-paragraph, or as to the reasonableness of any requirement of such a notice, the drainage authority must not except in an emergency exercise the powers conferred by sub-paragraph (5) until the dispute has been finally determined.