14. Any reasonable and proper additional expenses not otherwise provided for in this Schedule which the authority may incur in maintaining the Canal under any powers existing at the making of this Order by reason of the existence of a specified work must, provided that 42 days’ notice of the commencement of such maintenance has been given to the undertaker, be repaid by the undertaker to the authority so as to ensure that the authority has been reimbursed for all and any greater maintenance liability it incurs by reason of the existence of a specified work.