8.—(1) Without prejudice to the other provisions of this Part of this Schedule, the undertaker shall indemnify each drainage authority from all claims, demands, proceedings, costs, damages or expenses or loss, which may be made or taken against, or recovered from or incurred by the drainage authority by reason of—
(a)any damage to any drainage work so as to impair its efficiency for the purposes of flood defence,
(b)any raising or lowering of the water table in land adjoining the works authorised by the Order or any sewers, drains or watercourses,
(c)any flooding or increased flooding of any such lands,
which is caused by, or results from, the construction of any of the works or any act or omission of the undertaker, its contractors, agents or employees whilst engaged upon the work.
(2) The drainage authority concerned shall give the undertaker reasonable notice of any such claim or demand and no settlement or compromise thereof shall be made without the agreement of the undertaker which agreement shall not be unreasonably withheld.