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"perhaps in an unsuccessful attempt to get down to a dropped water table?"

Actually, I withdraw that. You'd first dig a single hole to see where the water table actually was, wouldn't you - unless you suffered from 21st century stupidity, which I doubt.

>You'd first dig a single hole to see where the water table actually was...<

Sounds sensible but... once you'd dug out your single hole and located the water table wouldn't you then cut the rest of the ditch to that level? (assuming of course you wanted a moat and not merely a well).