19.—(1) Any specified work must, be constructed and maintained—
(a)with all reasonable dispatch in accordance with any such plans approved or deemed to have been approved or settled as aforesaid and with any specifications made under paragraph 16 of this Part;
(b)under the supervision (if given) and to the reasonable satisfaction of the engineer;
(c)in such manner as to cause as little detriment as is reasonably practicable;
(d)in such manner as to cause as little inconvenience as is reasonably practicable to the Trust, its officers and agents and all other persons lawfully using the waterways, except to the extent that any temporary obstruction or restriction or diversion of the rights of navigation have otherwise been agreed by the Trust or are permitted under this Part;
(e)in such a manner as to ensure that no materials are discharged or deposited into the waterway under this Order otherwise than in accordance with article 19 (discharge of water); and
(f)in compliance with the Code of Practice.
(2) Nothing in this Order authorises the undertaker to make or maintain any permanent works in or over the waterway so as to impede or prevent (whether by reducing the width of the waterway or otherwise) the passage of any vessel which is of a kind (as to its dimensions) for which the Trust is required by section 105(1)(b) and (2) (maintenance of waterways) of the Transport Act 1968 to maintain the waterway.
(3) Following the completion of the construction and, to the extent that it would affect the waterway or any function of the Trust, any maintenance of the specified work the undertaker must restore the waterway, save in respect of the retention of the new permanent overhead line comprised in Work No. 6 (XC and XCP overhead electric lines, and XC overhead electric line) of Schedule 1 (authorised development), to a condition no less satisfactory than its condition immediately prior to construction or maintenance of that work, unless otherwise agreed between the undertaker and the Trust.
(4) In assessing whether the condition of the waterway is no less satisfactory than its condition immediately prior to the works pursuant to sub-paragraph (3), the Trust and the undertaker must take account of any survey issued pursuant to paragraph 15 and any other information agreed between them pursuant to this Part.