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I have a basement with a properly installed sump pump. I have another hole approximately 1 foot away from the sump hole cut to the same dimensions. There are at least 2 pipes that run into the unused hole that I thought were for drainage but the hole holds water. The sump pump and extra hole do not connect.

What is the second hole supposed to be used for? Should I fill it in?

  • Radon collection and exhaust never completed? – Tyson Apr 18 '18 at 15:03
  • Could be for a backup sump system. Some folks prefer two pails and isolated hardware. – isherwood Apr 18 '18 at 17:22
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    "2 pipes that run into the unused hole": where do they come from? – longneck Apr 18 '18 at 18:41
  • Do you mean you've observed the water level does not drop when the pump runs? – Harper Apr 18 '18 at 19:55
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    If pipes run into the hole, it could be a perimeter drain system. In any event, the water is coming from somewhere, and you don't want it there. I would install a sump bucket in the hole and tie the pipes into it. Put a sump pump in the bucket and pipe it out like the other one, discharging as far from your house as practical. – fixer1234 Apr 19 '18 at 0:42

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