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Thread: severe ground water HELP

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    severe ground water HELP

    I am digging for a 14 by 28 inground pool with a 7 ft deep end and hit water at 6ft and it is free flowing being my luck the ground is nothing but sand and is just turning to mush and it seems like when i tried to over dig to puty in rock it made it way worse. Now I have a 12by 15 hole of what looks to be quick sand. I would greatly appreciate some assistance through this. The forum will not let me post pics but i can email them to anyone. Thanks

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    linen's Avatar
    Join Date
    Jul 2010
    Twin Cities, MN

    Re: severe ground water HELP

    Welcome to tfp, michael24schwartz

    You can post pics on a site like photobucket, then link them here using the img button in the post editor.

    In situations like yours I have heard of using a dry well (or multiple dry wells) that is dug next to the pool to lower the local water table. Hopefully someone with direct experience will chime in.
    TFP Expert who uses Pool School and my TF100 test kit along with PoolMath for my: Round 11K gallon AGP with deep end, 20" sand filter, Matrix 1hp 2spd, 6 2ftX20ft solar panels (and solar cover!), Intex SWCG (copper bars disconnected) and a Rubadub hot tub (chlorine). The SLAM process is not finished until: 1. CC < 0.5 ppm, 2. An OCLT < 1.0 ppm and, 3. The water is crystal clear.

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    Re: severe ground water HELP

    When mine was dug the bottom of the deep end was soft and like quick sand, but it was a good time of year and we were lucky the water table was not higher. We got the rock in and it was pretty solid. When my plaster was put in two days ago, we just got hit with Andrea and the water table was up 2' in the pool. They hooked up a pump to the drain to pump water from under the pool for 30 hours while they plastered and acid washed. When they removed the pipe I expected to see water rushing in, but it did not. Over the 10 minutes it took them to get the drain plugs in, it rose a a few inches slowly.

    What I was getting at with the long story, is that a well point, as suggested above, with a pump running for 12+ hours should drop the water table in that area low enough for you to dig, fill with stone and compact the area. You will probably need the same well point or deep end drain when you shoot the gunite and plaster. My drains has a 2' 1-1/2" PVC tube I made with holes drilled in it, in the bottom drain fitting. It was bedded in gravel. That allowed it to really get good flow.
    32K gal, gunite, French Gray DB, IntelliFlo VF, IntelliFlo, WhisperFlo, Quad DE 100 filter, IntelliTouch, IC-60 SWG, IntelliChem, Dolphin M5

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