117.—(1) The undertaker must pay to ABP Ports all costs, charges, damages and expenses which may be occasioned to or reasonably and properly incurred by ABP Ports by reason of or arising from—
(a)any accumulation or erosion in consequence of the construction of a tidal work or the exercise of the powers to dredge conferred by this Order;
(b)any surveys, inspections, tests or sampling reasonably carried out to establish whether such accumulation or erosion is occurring or has occurred; or
(c)any obstruction or interference referred to in paragraphs 114 or 115.
(2) The undertaker must indemnify ABP Ports from and against all claims and demands arising out of, or in connection with such accumulation, erosion, obstruction or interference mentioned in sub-paragraph (1).
(3) ABP Ports must give the undertaker reasonable notice of any such claim or demand and no settlement or compromise of such a claim or demand is to be made without the prior consent of the undertaker.
(4) Nothing in this paragraph imposes any liability on the undertaker to the extent that any costs, charges, damages or expenses referred to in sub-paragraph (1) or (2) are attributable to negligence on the part of ABP Ports or any person in its employ or its contractors or agents.