EM USA Terms and Definitions - FEMA

The A Zone is the area subject to inundation during a 100-year flood, which is the flood elevation that has a 1-percent chance of being equaled or exceeded each year. ... and quarantine. Finally, first responders may be among the first casualties, rapidly overwhelming local and state support systems.” (JCS/DoD, CBRNE CM (JP 3-41), 2006, p ... ................
................