All lawn irrigation systems may be protected by an atmospheric pressure vacuum breaker (AVB) or a pressure vacuum breaker backsiphonage prevention assembly (PVB) when properly installed. These devices do not provide adequate protection if they are subject to flooding, back pressure, or it compressed air is used to winterize the system. In these situations, double check valve assemblies shall be used. In the event any system is equipped with an injector system or has submerged heads, a reduced pressure principle will be required.
(Ord. 387, passed 6-12-2006)