(a) Lawn sprinkler systems shall be equipped with a vacuum breaker on the discharge side of each area control valve.
(b) If a lawn sprinkling system is installed so different areas sprinkled are each controlled by a valve on the discharge side of the main control valve on the main distribution branch to the entire lawn sprinkling system, the system shall be protected by one of the following methods:
(1) An acceptable vacuum breaker may be installed on the discharge side of each zone control valve.
(2) Where the supply of water to the various zones is controlled by an acceptable automatic multiport zone control valve, at least one port of which is always open, an acceptable vacuum breaker may be installed downstream from the main control valve and upstream from the multiport valve.
(3) A reduced pressure principle backflow preventor may be installed on the main distribution branch to the sprinkler system in close proximity to the main control valve.
(4) An acceptable pressure type vacuum breaker may be installed between the main control valve and the zone control valves.
(5) If it is proposed to protect the water supply to a zone sprinkling system by a method other than one of those set forth in subsections (b)(1) through (b)(4) above, complete mechanical and topographical plans of the proposed installation shall be submitted to the Authority before the work is begun, for examination to determine the acceptability of the installation from the standpoint of protection of the water supply and from the standpoint of potential nuisance.
(Ord. No. 144, 5-16-2005)