New irrigation installation being installed thursday, any advice?

Discussion in 'Irrigation' started by ls3c6, Jul 17, 2012.

  1. ls3c6

    ls3c6 LawnSite Member
    from Midwest
    Posts: 101

    Will be a weathermatic system with SL800 controller and SLM10 weather station.

    Plot is ~20,000sqft and mostly flat, contractor is doing head-to-head spacing with rotors @ 30' distance.

    He will tap into the 1" line going into the basement after it enters the 5/8" meter, by my calculation this will provide for 15gpm.

    I assume he should be using 1.5gpm for 90 degree heads, 3gpm for 180 degree heads and 6gpm for 360 degree heads which would result in 1" per hour if the heads are 30' apart length or width?

    The reason i'm so concerned with precipitation rate is that the smart controller / weather station runs it's own runtimes with accordance to PR, soil type, slope and shade.

    feedback would be appreciated, too late to do it again once it's done if it's not right!
     
  2. DanaMac

    DanaMac LawnSite Fanatic
    Posts: 13,156

    If possible, get the contractor to put any full circles on its own zone. And 6 gpm per head will only allow 2-3 heads, so maybe even cut them to 4 gpm, allowing maybe 1-2 heads more per zone, but run that zone longer.

    What static pressure do you have? Could be difficult to get 30' if low pressure and too many heads per zone. I tend to space rotors at 24'-27' with our 55-65 psi (typical) and zones designed at 10-15 gpm.

    Just my $0.02
     
  3. ls3c6

    ls3c6 LawnSite Member
    from Midwest
    Posts: 101

    at the hose bib outside i have about 70psi

    is 30' too far then? he seemed extremely confident each head would reach the other head either by length or width
     
  4. DanaMac

    DanaMac LawnSite Fanatic
    Posts: 13,156

    Sometimes yes, sometimes no. All depends on the pressure foe the system, and the gpm output. If he stretches the zones - too many gpm output compared to what is available - then the heads will not shot as far as planned. It all depends on how good of a designer and contractor he is. I've seen heads spaced at 30', but only spray 20'-25' due to poor planning.
     
  5. ls3c6

    ls3c6 LawnSite Member
    from Midwest
    Posts: 101

    well if it's kept to UNDER 15gpm it should be no problem no? i'm not sure what to do other than let the install take place and if they don't hit each other, tell him i'm not paying for it?
     
  6. txirrigation

    txirrigation LawnSite Senior Member
    from Texas
    Posts: 977

    Rotors can spray well over 50', just depends what kind/nozzle.

    What kind of rotors and what nozzles will he be using?
     
  7. ls3c6

    ls3c6 LawnSite Member
    from Midwest
    Posts: 101

    not sure on exact model number, just know weathermatics and they're "rated" for 33ft per his design
     
  8. txirrigation

    txirrigation LawnSite Senior Member
    from Texas
    Posts: 977

    If he is spacing 33' rotors @ 30' it sounds like he knows what he is doing.
     
  9. cjohn2000

    cjohn2000 LawnSite Senior Member
    Posts: 553

    Speaking up precipitation and rotors. Has anyone tried the RB MPR nozzles for the 50000'? But I agree on separating full circles and halfs, if possible. I was always warned that anytime you start turning in the radius screw you are changing the DU, but I see this all the time.
     
  10. ls3c6

    ls3c6 LawnSite Member
    from Midwest
    Posts: 101

    I don't doubt know he knows what's going on at all, i'm just trying to determine how i'll know what it takes to get an inch of water down per zone so I can program the controller properly.

    No point in having an irrigation system installed if I can't get down exactly what I want, looking at the manufacturer data with a 180 degree swing they only put out like .3" per hour at 3gpm, so it'd need to run over 3hrs PER week PER zone to get 1" of water down? ouch!
     

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