In cases where a water meter shall fail, from any cause, to register water usage and consumption for any month or portion thereof, the division is hereby authorized, in its discretion, to compute the estimated actual usage and make charges for water and sewer service on the basis of an average of the metered or registered usage during the three (3) months immediately proceeding.
(1996 Code of Ordinances, Chapter 11, Article 3.00, Section 3.05)