In the event a lot, parcel of land, building or premises uses in excess of 10,000 gallons of water per month and it can be shown to the satisfaction of the City that a substantial portion of the water as measured by the water meter does not and cannot enter the sewerage facilities of the City, then the City may determine in such manner as may be found practicable the amount of water entering the sewerage facilities and the sewerage rate or charge shall be based thereon; or, the City may require or permit the installation of additional meters or measuring devices in such a manner as to determine the quantity of water or sewage actually entering the sewerage facilities, in which case the sewerage rate or charge shall be based thereon.
(1965 Code §22-5)