For John, BLUF: It is all a crap shoot. Nothing to see here; just move along.
It’s Time To Ditch The Concept Of ‘100-Year Floods’
This is from The Five-Thirty-Eight Blog, by senior science writer Maggie Koerth-Baker, on 30 August 2017.
A nice, brisk, discussion of the concept of the 100-year flood plain.
The thing about the 100-Year Flood Plain is that it does not mean a flood every one hundred years, but rather a 1% chance of a flood each year. That means that if you are unlucky (you avoid the tables in Las Vegas or Mohegan Sun) you could have a "hundred year flood" twice in two years. It isn't some sort of mathematical evil, it is just statistics.
Regards — Cliff
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