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"Sec. 25 -39. Irrigation Standards — Purpose. <br />The purpose of these rules and regulations is to provide minimum standards to conserve water, <br />support the city's drought contingency plan, and improve the overall quality of life for the <br />citizens of Paris by regulating and controlling the design, construction, installation, quality of <br />materials, location, operation and maintenance or use of irrigation systems. <br />Exceptions: The following systems are exempt from this article provided such systems are not <br />directly or indirectly connected to a public water supply. <br />(1) An irrigation system that is an on -site sewage disposal system, as defined by Section <br />355.002, Health and Safety Code; or <br />(2) An irrigation system used on or by an agricultural operation as defined by Section 251.002, <br />Agriculture Code; or <br />(3) An irrigation system connected to a groundwater well used by the property owner for <br />domestic use. <br />Sec. 25 -40. Definitions. <br />The following words and terms, when used in this ordinance, have the following meanings, <br />unless the context clearly indicates otherwise. <br />(1) Air gap - -A complete physical separation between the free flowing discharge end of a potable <br />water supply pipeline and an open or non - pressure receiving vessel. <br />(2) Atmospheric Vacuum Breaker - -An assembly containing an air inlet valve, a check seat, <br />and an air inlet port. The flow of water into the body causes the air inlet valve to close the air <br />inlet port. When the flow of water stops the air inlet valve falls and forms a check against back - <br />siphonage. At the same time it opens the air inlet port allowing air to enter and satisfy the <br />vacuum. Also known as an Atmospheric Vacuum Breaker Back - Siphonage Prevention <br />Assembly. <br />(3) Backflow prevention - -The mechanical prevention of reverse flow, or back siphonage, of <br />nonpotable water from an irrigation system into the potable water source. <br />(4) Backflow prevention assembly - -Any assembly used to prevent backflow into a potable <br />water system. The type of assembly used is based on the existing or potential degree of health <br />hazard and backflow condition. <br />2 <br />