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Ruadhan2300 t1_iydautb wrote

There's an XKCD for this.

https://what-if.xkcd.com/12/

What if a rainstorm dropped all its water in one big droplet...

Spoiler-alert, The answer is somewhere on the order of a megaton-range nuclear blast for half a cubic kilometer of water.

A dinosaur-killing meteor a dozen times bigger turned into more-or-less-water would clear the soil down to the bedrock for tens of miles, and flatten everything for thousands of miles radius, flash-flood half a continent, move mountains..

And that's assuming it started at 0 velocity a few kilometers up.
If it keeps any of its momentum it's just going to be worse.

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