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Thread: Water Under Pool

  1. Back To Top    #1

    Water Under Pool

    Hi All,
    I just started my 18X36 DIY inground project. I got the hole dug and everything was great.

    The next morning I found a few inches of water in the deep end. No rain, I pumped it out, next day same issue. Seems like a few inches a day of water basically fill in the hole.

    There are some springs on my property, but I do feel they are lower than the bottom of the pool.

    I have read all the floating liner horror stories, and so I think the solution is an over dig with gravel. Through in a PVC with holes, and pipe that out during construction. What I'm concerened about, is if what I have is a spring, does that mean I need some sort of pump on that pipe all the time?



  2. Back To Top    #2

    Re: Water Under Pool

    If you have ground water, then you only have to use a pump on the well point until the water level in the pool is at least 1 foot above the ground water level.

  3. Back To Top    #3
    JasonLion's Avatar
    Join Date
    May 2007
    Silver Spring, MD

    Re: Water Under Pool

    Welcome to TFP!

    It is very common to run into ground water on a dig. As long as the water level is well below the proposed surface of the pool you shouldn't have any problems once you have the pool installed. During the install you need to keep the bottom dry for at least several hours, and very preferably several days. That can be done with gravel, drainage pipe, and probably a sump pump. Once the pool is installed, the weight of the water in the pool will hold everything in place even if the bottom remains wet.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
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  4. Back To Top    #4

    Re: Water Under Pool

    Thanks, that makes me feel better. What causes all of the floating liner issues people talk about?

  5. Back To Top    #5

    Re: Water Under Pool

    Very high ground water can cause floating liner problems. As long as the ground water stays about 1 foot below the water level in the pool, the liner won't float. If you have high ground water, you should not use a steel wall panel.

  6. Back To Top    #6

    Re: Water Under Pool

    Perfect. I've got a good amount of drainage around the pool, Its up on a hill so I think we should be set. Thanks for the clarification. I guess I'm just being paranoid as the truck gets closer!

  7. Back To Top    #7
    Lershac's Avatar
    Join Date
    May 2007
    Baton Rouge, LA

    Re: Water Under Pool

    Good luck and post some pics of your build!
    (DIY):16K Gal 20X30 rectangular IG Gunite, w/spa, CCP 520 filter,2 Pentair VS pumps, 400KBTU Pentair gas heater, Heat Pump for cooling, **update5.25.2013** added an intellichem with acid pump that will control existing SWG. My Build Thread Here

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