I’ve heard of some areas/inner-cities requiring them on some properties for ground water recharge wells.
Perhaps the idea derived from old cistern tanks.
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At first I thought you were talking about this.
This is Zoeller but others have similar requirements but different location requirements for the hole.
So, the pit is there so you can watch the water drain?
If the basement floor is around 1200 sq ft, that’s about a 12" layer of 'stone "… Give or take a little depending on what kind of stone it is…
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Which would make it a better Radon Pit than a Sump Pit!
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That’s it?
Grow up.