The reports I've seen are describing the Houston situation as a 1 in a 1000 year flood. Does it really make sense to avoid a place based on the possibility of such rare events?
All within 12 years. I think we should stop measuring against data from a different global climate.
Calling it a '100 year flood' makes people think 'oh, good, now we shouldn't have one of those for another ~100 years'. In reality, the odds of a flood of the same magnitude occurring next year are exactly the same as they were this year.
Grady (of the Practical Engineering YouTube channel) has a great video on this topic: https://www.youtube.com/watch?v=EACkiMRT0pc
(Grady is in the Austin area, so hopefully he hasn't too much 'practical' experience from this storm...)
And the risk may be higher than 1/1000 per year given how much motivation is out there to understate the risk and say that nobody could have seen this coming.