Pressure and Flow

Discussion in 'Irrigation' started by ricecake, Feb 1, 2007.

  1. ricecake

    ricecake LawnSite Member
    Posts: 28

    I have just recently picked up a few homes in a subdivision. The contractor told me that he want irrigation and Landscape installs on both. The subdivision is set up as a homeowners association. Therefore, they will have one 2 inch line attaching to each homesite supplying the irrigation water. What is the best way to get the correct flow and pressure readings from this line? There is another LCO in this subdivision doing irrigation, and I though about asking the contractor to call them and ask.
     
  2. Flow Control

    Flow Control LawnSite Bronze Member
    Posts: 1,267

    Is the system looped? How many homes will be built total? Bring your supplier or local rep out. If the builder is offering X amount of guaranteed business, your local Hunter/Rain Bird rep would be slacking if he did not offer you some incentives to install a complete Hunter or Rain Bird system. Other things can also be negotiated with reps regarding model homes. Not really going to post anything here since it is a public site.


    I would definitely talk to the other LCO, introduce yourself and feel them out. You guys probably have a lot more in common then you think. If they come off the wrong way then just say thanks for your time and have a nice day.
     
  3. PurpHaze

    PurpHaze LawnSite Fanatic
    Posts: 5,496

    How big are the lots? How much and what type (lawn, planter, etc.) of irrigation is going to be necessary for each site?

    So he has more than one irrigation/landscape contractor working on the overall subdivision. I foresee potential problems.

    Where does this 2" line come from? Does it come from a central supply? Is there one backflow for the entire subdivision or will one need to be set for each lot? What about controller(s)?

    It all depends on too many variables. If you're using a common source then that is the best place to get the total PSI/GPM. If a special main line (or domestic water) has been supplied for the irrigation then you'll have to treat each site separately. You WILL have to work with the other irrigation/landscape subcontractor to insure that all systems will work. There must be coordination or the subdivision may be in for future problems.
     
  4. ricecake

    ricecake LawnSite Member
    Posts: 28

    I appreciate your help. I think that speaking with the other LCO is definately the quickest way to get the readings. Presently I think the other LCO is using Toro, but they are the largest Landscaping and Maintenance outfit in my area. I think that I will be using Hunter heads and Rainbird Valves.
     
  5. PurpHaze

    PurpHaze LawnSite Fanatic
    Posts: 5,496

    Good luck. Seems that you guys will need some coordination between you to make sure things run right.
     
  6. Flow Control

    Flow Control LawnSite Bronze Member
    Posts: 1,267

    Good Luck too, remember don't design at current pressure readings if it is a new and larger development.
     
  7. ricecake

    ricecake LawnSite Member
    Posts: 28

    How much should I plan on losing, I think that eventually there will be about 15 homes in a 7-8 acre area?
     
  8. Flow Control

    Flow Control LawnSite Bronze Member
    Posts: 1,267

    Should not be a problem. I was not sure if it was a large scale development. Good luck, is there a slow time in NC for installs.
     
  9. You need to find out the meter size and go from there IE: 1" meter w/60gpm, 2" meter w/ 120 GPM , etc. They do this type of system in my area and they use about 15pgm for each zone. The problem will be when each homeowner tries to run their system at the same time all the others are. I would size my zones on the lowend 10-12gpm and I would also use Rain Bird PRS spray heads.
     
  10. PurpHaze

    PurpHaze LawnSite Fanatic
    Posts: 5,496

    20-25% down the line in the future. Course, some guys don't care about the future. :)
     

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