For the purpose of this chapter, the following definitions shall apply:
A. "Backflow" means water of questionable quality, wastes or other contaminants entering a public water supply system due to a reversal of flow.
B. "Cross-connection" means a connection or arrangement of piping or appurtenance in which a back flow could occur.
C. "Safe air gap" means the minimum distance of a water inlet or opening above the maximum high water level or overflow rim in a fixture, device or container to which public water is furnished which shall be at least two times the inside diameter of the water inlet pipe; but shall not be less than one inch and need not be more than twelve inches.
D. "Secondary water supply" means a water supply system maintained in addition to a public water supply, including but not limited to water systems from ground or surface sources not meeting the requirements of Act No. 98 of the Public Acts of 1913, as amended, being Sections 325.201 to 325.214 of the Compiled Laws of 1948, or water from a public water supply which in any way has been treated, processed or exposed to any-possible contaminant or stored in other than an approved storage facility.
E. "Submerged inlet" means a water pipe or extension thereto from a public water supply terminating in a tank, vessel, fixture or appliance which may contain water of questionable quality, waste or other contaminant and which is unprotected against back flow.
F. "Water utility" means the city water department.
(Ord. 78-4 § 1 (part), 1977: prior code § 20.1001).