Isn't it kind of amazing that a few feet of water will completely devastate a city?

Yes.
All elements of nature that we need in moderation, when they happen to turn against us can devastate us.

Water's insanely powerful, as nature is.

No. There is nothing funny about a city being devastated.

It is. But that's nature for ya. Causing adverse weather when no one is prepared

I believe they've already had 30 inches of rain and much more still to come

Yes it really is