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  1. #1
    Member Rank = Sansai Mirza's Avatar
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    cutting the bottom of the concrete pond

    Has anyone ever done this before?

    at the time I made my pond I did not know anything about filtration, so I did not even make a bottom drain and after a while I figured out what kind of a mistake i made

    Eventually, I drilled the wall and put the pipe in the pond that goes to the bottom and takes water from the bottom,but that pipe is in one corner.
    Pond has a capacity of 7000 liters , i have gravity feed filter with two Eco pumps (each 5000 l/h) that perfectly doing their job ,water is spinning but most sediment falls to the center of pond .

    Now I would like to cut the concrete at the bottom and put the bottom drain , pipe from bottom drain would go to the corner and be connected to an existing pipe in the corner . So it's easy to do, but I'm afraid will my pond crack on the bottom after i cut it ..



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  3. #2
    Senior Member Rank = Gosai Scotts koi's Avatar
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    Hi how deep is your pond i only ended up with just over 4ft as i found the main sewer dain and didnt want my pond in that!! Cant u put the bottom drain ontop of your exsisting pond coni then coni the whole floor again with a slope all falling 2 your botton drain?

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  5. #3
    Member Rank = Sansai Mirza's Avatar
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    It is 120 cm (4feet) deep

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  7. #4
    Senior Member Rank = Adult Champion RS2OOO's Avatar
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    Yesterday, using a diamond core drill bit I drilled a 6" wide hole through my 1" thick limestone patio slab, down through 4" thick solid concrete, then continued down through 8" of hardcore base (which included blue engineering bricks), then continued down through 4" of clay.

    The hole was absolutely perfect, and it was done to retrofit drainage.

    If you can do similar with your pond I think it will be possible.

    There's a place in London called Hatton Garden and they bored 3 holes through a 12" thick solid concrete wall wide enough for people to crawl through, and they drilled these 3 holes in just one night, so it's definitely possible.

    The hard part will be tunneling underneath to fit the pipework. I did that before and it took me 2 weeks of evenings and weekends using hand tools.

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  9. #5
    i did exactly what your considering now to a friends pond when we extended it and installed a bottom drain, we cut a channel in the concrete for the pipe and bottom drain,( using a petrol stihl saw) and dug down outside the pond for access through the side. I think theres a thread on here actually with pictures .
    Just need the right tools and some common sense

    found it ..

    Re-work/upgrade

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  11. #6
    Member Rank = Sansai Mirza's Avatar
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    Thanks, that is a great topic with pictures and all the details. I have a tools for cutting , just to catch the free time cutting the bottom of the concrete pond

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  13. #7
    Quote Originally Posted by RS2OOO View Post
    Yesterday, using a diamond core drill bit I drilled a 6" wide hole through my 1" thick limestone patio slab, down through 4" thick solid concrete, then continued down through 8" of hardcore base (which included blue engineering bricks), then continued down through 4" of clay.

    The hole was absolutely perfect, and it was done to retrofit drainage.

    If you can do similar with your pond I think it will be possible.

    There's a place in London called Hatton Garden and they bored 3 holes through a 12" thick solid concrete wall wide enough for people to crawl through, and they drilled these 3 holes in just one night, so it's definitely possible.

    The hard part will be tunneling underneath to fit the pipework. I did that before and it took me 2 weeks of evenings and weekends using hand tools.
    lol

    They were old gits as well

    How about a retro fit bottom drain? Draco do a decent looking one, no drilling required.


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  15. #8
    Extreme Koi Member Rank = Nanasai anne's Avatar
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    You silly fllllucker RS...……………………………...Lol

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  17. #9
    Member Rank = Sansai Mirza's Avatar
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    under construction

    since that pipe is in the pond it really does bother me, I decided to hide it in an expanding foam, I'll cover it with a plaster and then I will cover it with several layers of waterproofing material
    so there's no contact between foam and water

    62784162_2344545809125436_3308568764450078720_n.jpg
    62189879_391860484871354_7335140397322076160_n.jpg
    62161595_376751226294081_3271060295363067904_n.jpg

    62310618_622819058197584_3349433952342376448_n.jpg

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  19. #10
    Extreme Koi Member Rank = Hassai Frich's Avatar
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    i wouldn't use foam if i where you, since that you risk it collapsing under the water pressure.

    if you want to make it so you are sure it lasts, get some bricks and build them up on each side of the pipe, and then add some plaster.

    as for the bottom, i would cut a hand full of slits across the channel, approximately 1" wide and 2-3" deep, and 10" on each side of the channel, then drop in a piece of 8-10mm rebar and seal it up again with concrete.

  20. #11
    I haven't read the whole thread sorry but what are you planning on lining the pond with?

    Sent from my BBF100-1 using Tapatalk
    Built not bought!

  21. #12
    Member Rank = Sansai Mirza's Avatar
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    Quote Originally Posted by dave_vr6 View Post
    I haven't read the whole thread sorry but what are you planning on lining the pond with?

    Sent from my BBF100-1 using Tapatalk
    It is coated with Sika K1 waterproofing

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  23. #13
    Quote Originally Posted by Mirza View Post
    It is coated with Sika K1 waterproofing
    I would of shuttered the pipework uprights and back filled with concrete.

    If you where glassing then the foam would of been fine.

    Sent from my BBF100-1 using Tapatalk
    Built not bought!

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  25. #14
    Member Rank = Sansai Mirza's Avatar
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    cutting the bottom of the concrete pond

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  27. #15
    Senior Member Rank = Jussai Ajm's Avatar
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    Did you use the foam or get rid ?

    Sent from my SM-N950F using Tapatalk
    Johnathan

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  29. #16
    Member Rank = Sansai Mirza's Avatar
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    Quote Originally Posted by Ajm View Post
    Did you use the foam or get rid ?

    Sent from my SM-N950F using Tapatalk
    I did use foam .

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