backflow question??

Discussion in 'Irrigation' started by baddboygeorge, Nov 8, 2006.

  1. baddboygeorge

    baddboygeorge LawnSite Bronze Member
    Posts: 1,249

    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
     
  2. Dirty Water

    Dirty Water LawnSite Fanatic
    Posts: 6,794

    Then you use a RPZ instead of a PVB.
     
  3. Sigh............................
     
  4. PROFESSORRAIN

    PROFESSORRAIN LawnSite Member
    Posts: 246

    but do you still do 12" above the wall.
     
  5. More sighs..........................
     
  6. PurpHaze

    PurpHaze LawnSite Fanatic
    Posts: 5,496

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