Staying Safe: a guide to flooding in the Guadalupe River Basin   Guadalupe-Blanco River Authority Website
6. What is a "100-Year Flood"?
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What is a "100-Year Flood"?

It does not mean that your area will flood only once every one hundred years. Rather, it is a reflection of the magnitude of a flood - one so big that it has a one percent chance of happening in any given year. A person could live their entire life and never experience a 100-year flood. Or, they could be unfortunate enough to experience several 100-year floods in one year or just a few years apart.