If the lot, parcel of land, or premises discharges normal sewage or industrial waste into the sanitary sewage system, either directly or indirectly, and it can be shown to the satisfaction of the Council that a portion of the water measured by the water meter does not and cannot enter the sanitary sewage system, then, and in that event, the Council may permit or require the installation of other or additional meters in such a manner that the quantity of water which actually could enter the sewer system may be determined. In this case the charges or rates shall be based upon the amount of water which can enter the sanitary sewage system.
(1997 Code, § 19.36)