Can a 2 GPM Well Support Irrigation?

Discussion in 'Irrigation' started by Greg G, Jul 7, 2011.

  1. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,611

    I'll chime in when I get better wi-fi range.
     
  2. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,482

    so, is Charlotte on sandy soil, or heavy clay?
     
  3. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,611

    Was there a "pump-down" test done on the well? Will it pump 2.0 gpm continuously? Adding another cistern would be a suggestion. The big deal concerning low-recharge systems is the design and the math: you've got to know the zone demand down to a drop and program accordingly to the recharge. I've done them with 3.0 gpm with plenty of storage AND a controller that has either a delay feature or, better yet, independent station programming. The (no longer made :hammerhead:) Hardie "Touch Command" was perfect for cistern application. The W*M controller has a delay in between zones feature that works for one of my cistern systems, the others have Rain Master controllers with independent station programming. The MATH is the big deal; prepare to spend some time working on application sheets, but it can be done. Finally, consider adding smaller zones and as much Netafim drip as you can. I'd double pump, and use a "on-demand" pumping system for the irrigation.

    DSCN1860cistern.jpg
     
  4. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,482

    that's where the Morlocks lived
     
  5. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,611

    The echo is great in those cisterns.
     
  6. Greg G

    Greg G LawnSite Member
    Posts: 23


    I don't know if a pump-down test was done but there is a metal tag affixed to the well head that is stamped 2 GPM. There is other info there also but I'll have to check it again to see what else is there.


    I will certainly ask about doing that.

    Thanks for the info Thumbs Up
     
  7. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,482

    Thing is, if you employ the very general yardstick of one inch of water a week, your 2 gpm well is running 24/7 to supply an inch of water to a 3/4-acre landscape (27,000 gallons per acre per week)

    That leaves you drinking bottled water and bathing with moist towelettes.
     
  8. If only he could get 33% more from the well. Would make all the difference.
     
  9. Wet_Boots

    Wet_Boots LawnSite Fanatic
    Posts: 46,482

    another important question is whether he can long stand to do without water, if the definitely-overworked pump gives out
     
  10. Mike Leary

    Mike Leary LawnSite Fanatic
    Posts: 21,611

    It's the math, Oblio. I've run two houses + irrigation with zip water. That's why storage is the big deal; to not overwork the pumps. I had one site where two pumps were used to transfer, and still provide household water. However, the clouds are usually in the horizon; I finally convinced one client to drill another well because of the constant management the three transfer tanks the system required.
     

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