Certified Floodplain Manager (CFM) Practice Exam

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What is the Base Flood known as?

  1. 500 Year Flood

  2. 50 Year Flood

  3. 100 Year Flood

  4. Annual Flood

The correct answer is: 100 Year Flood

A 500 Year Flood means that the probability of such a flood occurring in any given year is 1 in 500 or 0.2%. A 50 Year Flood has a probability of 1 in 50 or 2%. An Annual Flood means that this level of flooding occurs every year, making it a less severe event than a 100 Year Flood. In terms of the Base Flood, the 100 Year Flood is used as a standard benchmark for flood risk assessments and insurance purposes, making it the most well-known and important designation. Therefore, the correct answer is C 100 Year Flood.