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Cost effective design vs text book design?

Discussion in 'Irrigation' started by duckworth, Jul 2, 2012.

  1. duckworth

    duckworth LawnSite Member
    Messages: 163

    I do irrigation as a branch off my business for about 3 years now and l really like it .When l sell main business l will keep irrigation as a semi retirement job.So l lack experience and this forum is awesome .bla bla bla here's my question small lawn 20x40, 6 2000 total GPM around 3. Text book design requires more digging in the real world with all the extra GPM would you just dig the easiest route . Oh ya there's 12 GPM available.
     
  2. FIMCO-MEISTER

    FIMCO-MEISTER Banned
    Messages: 18,668

    Don't completely understand what you are asking. Can you post the layout?
     
  3. duckworth

    duckworth LawnSite Member
    Messages: 163

    In good design you try to divide your pipe runs to get a balanced flow to each mp head.in my situation there are tree roots that will make that difficult but if l run my mp heads in around the perimeter head after head the job will go a lot faster,will that effect my last head even though l have lots of GPM left over?
     
  4. FIMCO-MEISTER

    FIMCO-MEISTER Banned
    Messages: 18,668

    It's a math problem. Do the math and see. If you use prs heads it becomes a non issue unless you do something real wacky with the pipe.
     
  5. greendoctor

    greendoctor LawnSite Fanatic
    Messages: 9,762

    I agree with Fimco. You have got to have done something really bad in order for a non text book design to bomb on you. Most of what I see would not work even if it were text book. I am talking about overdrawing what is available at the POC. I utilize PRS heads and MP Rotators extensively to make a less than text book design work.
     
  6. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,334

    PRS heads do you no good if there isn't sufficient pressure to begin with, in fact it will make it worse. Crunch the numbers with a generous allowance for error.
     
  7. duckworth

    duckworth LawnSite Member
    Messages: 163

    Crunched numbers and l will be okay .Thanks for input.
     
  8. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,334

    Yea, but only if you crunch them correctly. I have seen many, many systems where "irrigators" took the easy way out, ran a bunch of sprinklers in series, and the last 25% of the sprinklers didn't have anywhere near the flow or pressure they needed. Further, if you design too close to your anticipated supply flow/pressure, and there is any variance in that supply, you are screwed.
     
  9. duckworth

    duckworth LawnSite Member
    Messages: 163

    12gpm available at source .6 pro spray heads with 2000 mps in series spaced every 20"using 3/4 cl 200 pipe. First head 30' from vb.l got GPM at under 3 GPM ,unless l'm missing something l should be fine.
     
  10. Kiril

    Kiril LawnSite Fanatic
    Messages: 18,334

    If you are looking for my stamp of approval, you will not get it without presenting a full blown design, pics of the site including a relatively recent aerial view.
     

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