The City Manager is hereby authorized to make such rules and regulations as are required with regard to the application of the sewer service charge, as such rules and regulations pertain to adjustments for leaks or other causes which the City Water Department records indicate constitute sufficient reason for an equitable adjustment and a reduction in the charge in order to avoid unduly penalizing any innocent victim of circumstances over which he had no control. A record of all such adjustments shall be maintained and furnished monthly by the City and shall not become final until approved by the City Manager or other authorized City official. The City's approval of such adjustment list shall be considered as approved in its entirety unless the City Manager or other duly authorized representative of the City notifies in writing of its disapproval of any or all of the adjustments made. In the event of such disapproval, the adjustments or corrections already made by the Water Department shall be added back to the customer's account and shall constitute a legal obligation.