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New irrigation installation being installed thursday, any advice?

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

  1. irritation

    irritation LawnSite Gold Member
    Posts: 3,248

    I don't think our water co would install a bigger meter unless it quit spinning.
  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,650

    some towns are thrilled to do so, because they get a couple of hundred for the change
  3. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,432

    5/8 = 15gpm
    3/4 = 22gpm
    1.0 = 36gpm

    safe working practices suggest 75 - 80 % or about 12gpm for a 3/4 meter.

    not knowing what the shape of the turf area is i jvst figure that a rectangle of 100 x 200 is 20,000 sf.
    with the op's assumptions of head requirements i think it's gonna be tough to get full coverage with 8 zones aint it?
    Posted via Mobile Device

    and we have no idea of the working pressure?
    Last edited: Jul 17, 2012
  4. irritation

    irritation LawnSite Gold Member
    Posts: 3,248

    Back in the early days they gave away meters for irrigation, I just had to go to the town hall and pick them up.
  5. I've got tired head boots so I'll do my math in the morning but let's say we have 100' of 1" copper before the meter. PVB for back flow. Use the ops 70psi static. What is the max zone size with a 5/8 meter and what is the max zone size 1" meter. Forget the surcharge for now.
  6. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,432

    i meant 12gpm for a 5/8 meter vsing 75 - 80 %
    Posted via Mobile Device
  7. DanaMac

    DanaMac LawnSite Fanatic
    Posts: 13,156

    Jim, I try to stick around 12 gpm and most our meters are 5/8. I can push more and do ok, but I try to stay at 12.
    Posted via Mobile Device
  8. Kiril

    Kiril LawnSite Fanatic
    Posts: 18,308

    1) Design to the flow you have at the pressure you need (i.e. dynamic pressure) with allowance for supply variations (10-20%)

    2) If you want to know your PR with any amount of accuracy then run a catch can audit. I fail to understand why this simple task is such a foreign concept to professional irrigators. As an alternative you could use the total area method, however that is typically not a preferred method as it's accuracy is highly questionable in most cases.

    3) Rotor spacing should be based on the area being irrigated, then nozzle choice, which is based on nozzle pressure, which is based on dynamic pressure. Without knowing these variables you can only guess at proper spacing. As with supply flow, I always allow for error when spacing heads, as well as prevailing environmental conditions and any special site specific considerations. That could mean a 5-15% reduction in spec radius.

    4) Why people here are commenting on irrigation amounts per week is beyond me. The man simply needs to know each zones PR rate to a 10th of an inch to program the controller correctly .... which brings us back to do an audit!
  9. My guess is most irrigators don't think about catch can audits because they don't have any catch cans. Maybe you can explain to the op how to do a catch can audit with tuna cans or some other household item he may have a bunch of.
  10. 1idejim

    1idejim LawnSite Fanatic
    Posts: 9,432

    numbers yet? on the road will check back in an hr.
    Posted via Mobile Device

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