Pgm Bucket Test

Discussion in 'Irrigation' started by cenlo, May 3, 2005.

  1. cenlo

    cenlo LawnSite Senior Member
    from Ontario
    Posts: 322

    When testing the gpm with a five gallon pail, does it matter if the water is taken from the 1/2" supplied hose bib. And when I stub a 5/8" or 3/4" supply line from the 5/8" meter will it increase the gpm available?

    Thanks, Don
     
  2. Broker

    Broker LawnSite Senior Member
    Posts: 382

    When designing for a 3/4" supply line, testing a 1/2" line is pointless.
     
  3. Mdirrigation

    Mdirrigation LawnSite Silver Member
    Posts: 2,754

    But testing with a 1/2 suply line is generally the only available place to do it. If you design the system on whats available thru a 1/2 hose bib the system will operate even during times of high water usage in the area. I have found that on city water the flow rate available in march ,april and may is higher than whats available in July and august . ( more homes are using water ) I have 5 areas that sprinklers wont work on saturday afternoon in mid summer due to this. Second if you are installing the BFP at the house the main shut off valve for the house inside at the 3/4 line actually restricts the flow to the equivilent of a 1/2 inch line .
     
  4. Broker

    Broker LawnSite Senior Member
    Posts: 382

    Every house in this area will have the service line, meter then boiler drain.
     
  5. cenlo

    cenlo LawnSite Senior Member
    from Ontario
    Posts: 322

    I agree, how in the world can I get the gpm? Am I supposed to use complete $200.00-$300.0 worth of work and plumb the new 3/4" supply line to the exterior of the house in every job that I estimate?
     
  6. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 47,992

    ...and remember to take it out of your truck when the cold nights return, because the gauges will freeze. Use it to test the flow and pressure at a hose bibb nearest the water meter. What you see at the faucet will be there for you when you fully plumb the system, plus whatever pressure is lost through the half inch faucet and pipe while you're measuring.
     
  7. cenlo

    cenlo LawnSite Senior Member
    from Ontario
    Posts: 322

    thanks alot :)
     
  8. Dirty Water

    Dirty Water LawnSite Fanatic
    Posts: 6,799

    If you test from a 1/2 hose bib, and design your system around those results then you will ensure good coverage even under peak water demands.

    Its a good practice to get into. There are so many systems that I end up going back after another installer and splitting the zones because they did not calculate the GPM properly.
     

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