9.—(1) The undertaker must indemnify and compensate the relevant drainage authority in respect of all costs, charges and expenses, the relevant drainage authority may reasonably incur by reason of—
(a)the review, examination or approval of plans and supporting evidence under this Part;
(b)the inspection of the proposed site for construction and construction of the specified work or any protective works required by the relevant drainage authority under this Part; and
(c)the carrying out of any surveys or tests by the relevant drainage authority which are reasonably required in connection with the construction of the specified works.
(2) Any demands made by a drainage authority in respect of costs, charges and expenses sub- paragraph (1) must be accompanied by evidence.