Best soulution for a narrow area?

Discussion in 'Irrigation' started by CRUZMISL, Feb 3, 2006.

  1. CRUZMISL

    CRUZMISL LawnSite Member
    from zone 6
    Posts: 186

    Hi All,
    I have an area that is approx. 100' in length, 20' wide with a sidewalk running down the middle. The area has a wooden fence on one side (of the length) and the street on the other.

    I'm curious how you would tackle the irrigation without watering the road or soaking the fence. I only have 2 zones to work with and a max GPM of 9 to 10 gallons per zone.

    Thanks!

    Joe
     
  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,999

    Going strictly by the book, and assuming a four foot walk in the exact middle, you get two strips 8x100, and with less than 10 gpm and at least 30 psi at the heads, you could use side strip sprays, in a double row on each strip. Nothing (much) on the fence, sidewalk, or road. Rainbird makes special left-corner and right-corner side strip nozzles, but you don't have enough water to space everything head-to-head.
     
  3. CRUZMISL

    CRUZMISL LawnSite Member
    from zone 6
    Posts: 186

    Sorry, I should have mentioned the sidewalk is 4' from the road so it's not centered.....
    It's a tough spot with the gpm and zones I have to work with....
     
  4. bicmudpuppy

    bicmudpuppy LawnSite Silver Member
    Posts: 2,781

    so we have a 4x100 and a 12x100. The 4x100 using 2 -ESTs and 3 CSTs would give you about 5gpm. This isn't fantastic coverage, but you would get everyting "Wet" and only water turf. The 12x100 could be done with 11 heads. 2 12Qs and 912Hs. I would space 6 heads on one side and 5 on the other with 10' between each head. This means a 20' spacing per side. Again, this isn't a great coverage answer, but it would be minimum coverage with no overspray and we are talking about 13gpm.
     
  5. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,999

    As mentioned, 4x100 is a piece of cake for one zone. To do the 12x100 on a single zone, with your 9-10 gpm, means using 18 heads, 9 a side, giving you 12 foot square spacing. As much as one might like to have head-to-head spacing, you don't have enough flow for those 18 heads unless they have 8 foot radius nozzles. That layout would use 8 gpm at 30 psi. (sometimes more is less) ~ not a textbook layout, but it will cover if you have the pressure.

    If it was my fence, I'd plant a bed along its entire length, and use low-angle rotors along the sidewalk and just overthrow into the bed. 6 little rotors would do it.
     
  6. PurpHaze

    PurpHaze LawnSite Fanatic
    Posts: 5,496

    LOL... Heeeeeere we go again. Freakin' narrow areas and whether to throw across a sidewalk or not. :p
     
  7. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,999

    All this twiddly-ass stuff makes you appreciate large turf, don't it?
     
  8. CRUZMISL

    CRUZMISL LawnSite Member
    from zone 6
    Posts: 186

    He he, no argument there as I could care less. Besides timer is usually set to water at 5am.

    I was considering using the MP2000's in a staggered/alternating configuration every 15 feet or so. They will get a bit of the fence but shouldn't be too bad since the radius is 20ft. The gpm @ 50psi is .83 so flow shouldn't be an issue and I could have 10 on each zone which is more than I need.

    Something like a layout below ehre the circles represent a head. Sorry for the line. It's the only way it would show the layout correctly.

    o


    __________o



    o


    __________o



    o


    __________o

    Thoughts?
     
  9. PurpHaze

    PurpHaze LawnSite Fanatic
    Posts: 5,496

    You're basically describing a triangular layout versus a square layout where sprinklers would be across from each other. It'll work fine but you just have to watch the ends. Too close and too much water. Too far and you'll have drying out at the ends. With something like the MP-Rotators you could put the last ones closer to the ends and then tone down the arc. Not perfect but you're facing one of those situations where you wished you had more GPM which would offer a lot more alternatives. :waving:
     
  10. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,999

    If you can get the sidewalk wet, then it's all too easy. Six heads on a side in 20 foot square spacing. Six heads per zone. Hunter #5 for the halves and #2 for the corners. Or if you want it to look really pretty, use Toro 300's with 02 nozzles.

    Now, if you're a real cheapskate, you could run four heads on one side of the strip, two in the corners and two in between, and on the opposite side, three half-circle heads. Then, the whole shebang could be a single zone. #2's in the corners and #4's for the halves (spraying slightly less than the quarters are, so it all balances out)

    Prepare for Texans to show up and yell at you for overthrowing the sidewalk,
     

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