I'll eliminate the backstory and cut to the chase for brevity.

I'm looking for a Scottish Gaelic translation of the phrase, "After us, the deluge," that matches the intent/context of its use in the following passage:

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Paul had a vision of civilization as a vast and faulty dike, with
thousands of men like Doctor Pond in a rank stretching to the
horizon, each man grimly stopping a leak with his finger.

[and later]

"That's almost good enough to carve over your mantel...."
"How about, 'After us, the deluge,'" said Paul.
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If that's at all unclear then another way the author might have expressed the same meaning I'm going for could have been, "After we're gone, there will be a flood."

Thanks in advance for any responses!

Às ar deidh, an dìle [enlarged, so that you can see the accents clearly]

There are some others on the forum who have some Gaelic, so I suggest waiting for input from them, especially if this is for a tattoo.

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I'm not a native (or entirely fluent) speaker, so be sure to wait for confirmations/corrections, especially for tattoos.

Thank you for responding! I may give it a shot on the Irish language forum too. My grandparents on one side spoke Scottish Gaelic, and on the other they spoke Connacht Irish. So, it's a toss up for the tattoo.