The following words shall have the meanings set out herein:

    "Backflow" means the reversal of the normal flow of water caused by either back-pressure or back-siphonage.

    "Backflow prevention assembly" means an assembly or means designed to prevent backflow. See Utah Plumbing Code as adopted for specifications of such assemblies.

    "Back-pressure" means the flow of water or other liquids, mixtures or substances under pressure into the feeding distribution pipes of a potable water supply system from any source other than the intended source.

    "Back-siphonage" means the flow of water or other liquids, mixtures or substan-ces into the distribution pipes of a potable water supply system from any source other than the intended source, caused by the reduction of pressure in the potable water supply system.

    "Cross connection" means any physical connection or arrangement of piping or fixtures which may allow nonpotable water or industrial fluids, or other material of questionable quality, to come into contact with potable water inside a distribution system. This phrase includes any temporary connections including swing connections, removable sections, four-way plug valves, spools, dummy sections of pipe, swivel or changeover devices, sliding multiport tubes, or other similar plumbing arrangements. (Ord. 91-02 § 1)