For the purpose of this subchapter, the following definitions shall apply unless the context clearly indicates or requires a different meaning.
BACKFLOW. The undesirable flow of water or mixtures of water and other liquids, gases or other substances under positive or reduced pressure into the Water Utility (hereinafter "Utility") potable supply of water from any source.
BACKFLOW PREVENTION. A means designed to prevent backflow caused by backpressure or back-siphonage; most commonly categorized as air gap, reduced pressure principle assembly, double check valve assembly, pressure vacuum breaker assembly, back siphonage vacuum breaker (spill resistant vacuum breaker) assembly, atmospheric vacuum breaker, hose connection vacuum breaker, hose connection backflow preventer, backflow preventer with intermediate atmospheric vent, and barometric loop.
BACKPRESSURE. An elevation of pressure in the downstream piping system (i.e., pump, elevation of piping, or steam and/or air pressure) above the utility supply pressure, which would cause or tend to cause a reversal of the normal direction of flow.
BACK-SIPHONAGE. The flow of water or other liquids, mixtures or substances into the utility's potable water supply system from any source caused by the sudden reduction of pressure in the utility's potable water supply system.
CROSS-CONNECTION. Any physical connection or arrangement between two otherwise separate systems, one of which contains potable water from the Utility, and the other containing water from a private source, water of unknown or questionable safety, or steam, gases, or chemicals, whereby there may be a flow from one system to the other, the direction of flow depending on the pressure differential between the two systems.
CROSS-CONNECTION CONTROL MANUAL. Policies for cross connection control and backflow prevention for the city.
(Ord. 2670, passed - -)