If: (a) a lot, parcel of land or premises discharges sewage or industrial waste into the sanitary sewerage system, either directly or indirectly; and (b) the amount of water is such that the rate or charge will be in excess of the minimum monthly bill therefor; and (c) if it can be shown to be satisfactory to the city council that the portion of the water measured by the water meter or meters does not and cannot enter the sanitary sewerage system; then, and in that event, the city council is authorized to require or to permit the installation of other or additional approved meters in such a manner that the quantity of water which actually enters the sanitary sewerage system may be determined. In that case, the charges or rates shall be based upon the amount of water so shown actually to enter the sanitary sewerage system. Charges and rates determined as provided in this section shall not be less than the minimum rate established by city ordinance from time to time herein for each meter and the amount to be paid in any month shall not be less than the aggregate of the minimum bill established for all meters used to measure the water received for such lot, parcel of land or premises. (Amended during 1997 codification: prior code § 38-4-3)