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My break wall on the lake has a 8” high by 2’ wide void under a corner and is leaking into my retaining wall chamber. It is under the water line. How can I fill this hole?

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    A picture, drawing, or sketch edited into your question would probably help people get a better idea of what's going on here.
    – FreeMan
    Nov 24, 2020 at 11:27
  • 20 cm by 60 cm is rather more than a "void" ! I agree with SolarMike -- put in a temp wall, pump out the enclosure, fill&repair as appropriate. Nov 24, 2020 at 16:17

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Drain the lake then repair properly or dam the water back and then repair.

Which you can do is governed by the size of the lake.

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  • You can apparently just form it up and pour concrete - concrete is heavier than water and will displace it, but it's likely simpler for most people to attempt forming it up in a manner that also dams it on the lake side and then pump out the non-lake side before pouring. Presumably when large projects are done the other way some adjustment to the mix is applied to account for the additional water.
    – Ecnerwal
    Nov 24, 2020 at 17:23

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