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View Full Version : backflow question??


baddboygeorge
11-08-2006, 11:48 PM
they state that the backflow preventor needs to be 12 inches higher than the highest sprinkler head? Rite?? if thats the case what do ya do if the main lawn is all on the same grade an then you hit a retaining wall of 4 foot in height with a 100 foot long by 15 foot wide patch of lawn that also needs irrigation ! please let me know ! thanks George

Dirty Water
11-09-2006, 12:01 AM
Then you use a RPZ instead of a PVB.

SprinklerGuy
11-09-2006, 12:09 AM
Sigh............................

PROFESSORRAIN
11-09-2006, 12:15 AM
but do you still do 12" above the wall.

SprinklerGuy
11-09-2006, 12:33 AM
More sighs..........................

PurpHaze
11-09-2006, 09:24 AM
Go here: http://www.epa.gov/safewater/crossconnection.html