"Billable flow" means a user's recorded water usage as metered by the appropriate water utility, plus metered water from wells and other sources, and less any sewer-exempt metered data, times the city-approved percentage factor for wastewater entering the sewer system out of the metered water. Residential users on unmetered wells and users with no history of billable flow shall have their billable flow estimated by averaging, the billable flow of the other residential users of the same class.
(Ord. 93-24 Art. I (part), 1992; Ord. 80-19 Art. I § 5, 1979).