100-year Flood
A one-hundred-year flood is calculated to be the level of flood water expected to be equaled or exceeded every 100 years on average. The 100-year flood is more accurately referred to as the 1% annual exceedance probability flood, since it is a flood that has a 1% chance of being equaled or exceeded in any single year. Similarly, a flood level expected to be equaled or exceeded every 10 years on average is known as a ten-year flood. Based on the expected flood water level, a predicted area of inundation can be mapped out. This floodplain map figures very importantly in building permits, environmental regulations, and flood insurance.
Read more about 100-year Flood: Probability, Statistical Assumptions, Probability Uncertainty, Upslope Factors, Downslope Factors, Prediction
Famous quotes containing the word flood:
“Now in contiguous drops the flood comes down,
Threat’ning with deluge this devoted town.
To shops in crowds the daggled females fly,
Pretend to cheapen goods, but nothing buy.”
—Jonathan Swift (1667–1745)