Definitions for "Base Flood"
The flood having a one percent chance of being equaled or exceeded in any given year.
Flood that has as 1-percent probability of being equaled or exceeded in any given year. Also known as the 100-year flood.
A flood event that has a one percent chance of being equaled or exceeded in a specific location during any given year. Sometimes called the “100-year flood,” this hypothetical flood serves as the benchmark for FEMA's risk assessments and the basis for many mapping elements.