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Thread: water behind liner.... french drain?

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    water behind liner.... french drain?

    Hi All -

    Peeked under my cover here in upstate NY a couple of weeks ago and everything was looking grand.... then the snow melted... and it filled up with water behind my 5 month old liner. a real bummer.

    Now my first liner was ruined because this happened, but i actually thought it was caused by the water level getting above the coping...and then leaking down behind. i was wrong....obviously.

    So i know I will probably be able to fix it and might end up with some wrinkles...

    I want to prevent this if at all possible.

    Would digging a french drain around the edge be worth it? I have a wet backyard but i do have some grade around half of my pool that i could funnel water away.. My shallow end is 38" and my deep end is 72", how deep would the trench have to be? Also I'm slightly concerned about what is under my concrete deck....

    Sometimes, i want to fill this thing in with dirt.

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    JasonLion's Avatar
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    May 2007
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    Re: water behind liner.... french drain?

    Yes, a french drain will solve the problem, but they tend to be quite expensive. Your other option is to keep the water level in the pool higher. As long as the pool water level is higher than the ground water level the liner can't float. Of course this makes winterizing more complex.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: water behind liner.... french drain?

    well, things froze pretty solid around here this year... My water level was never below 18" under the coping, and for most of the winter is was probably more like 6".... so i don't think i could have put it any lower.

    How deep would you go?... i was thinking like 48"

    I would be doing this myself. i had to do this around the foundation of my house as well

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    JasonLion's Avatar
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    May 2007
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    Re: water behind liner.... french drain?

    The french drain must be noticeably lower than the water level in the pool, preferably a couple of feet lower (or more).

    I was saying that the pool water level being higher would improve things.
    19K gal, vinyl, 1/2 HP WhisperFlo pump, 200 sqft cartridge filter, AutoPilot Digital SWG, Dolphin Dynamic cleaning robot
    Creator of PoolMath and Pool Calculator. Other handy links: Support this site, TF Test Kits, Pool School

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    Re: water behind liner.... french drain?

    Gotcha, i was just saying that i kept it high like you were suggesting so we could rule that out.

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    Join Date
    May 2013
    Location
    Ontario, Canada
    Posts
    61

    Re: water behind liner.... french drain?

    I had a similar problem and put in a makeshift french drain using a piece of 12" pipe, holes drilled all around (perfed) and ran up what appeared as a second skimmer near the pool. To do this I had to take out a small section of concrete beside the pool and redo after the dig was complete. This allowed me to drop in a submerssible pump and remove the water as the levels around the pool rose.

    It wasnt the best option but it did work. The other things are all about keeping as much water away from the pool as possible. I re-directed my rear downspouts and buried them running out past the pool.

    Good luck with the project.
    18' x 36' vinyl steel wall pool with deep end, 2 lights and 6' steps, main drain, SWG, Cartridge Filter, 320,000 BTU Rheem heater, 3/4HP 1 stage pump - Ontario, Canada

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