31.—(1) Subject to sub-paragraph (3) Network Rail must from the commencement of the construction of the specified works maintain in good repair and condition and free from obstruction any drainage work which is situated within the limits of deviation or on land held by Network Rail for the purposes of or in connection with the specified works, whether or not the drainage work is constructed under the powers conferred by this Order or is already in existence.
(2) If any such drainage work which Network Rail is liable to maintain is not maintained to the reasonable satisfaction of the lead local flood authority, the lead local flood authority may by notice in writing require Network Rail to repair and restore the work, or any part of such work, or (if Network Rail so elects and the lead local flood authority in writing consents, such consent not to be unreasonably withheld or delayed), to remove the work and restore the site to its former condition, to such extent and within such limits as the lead local flood authority reasonably requires.
(3) This paragraph does not apply to—
(a)drainage works which are vested in the lead local flood authority, or which the lead local flood authority or another person is liable to maintain and is not prescribed by the powers of the Order from doing so; or
(b)any obstruction of a drainage work for the purposes of a work or operation authorised by this Order and carried out in accordance with the provisions of this Part of this Schedule.