100-year Flood
A statistic that indicates the magnitude of flood which can be expected to occur on average with a frequency of once every 100 years at a given point or reach on a river. The 100-year flood is usually developed from a statistical distribution that is based on historical floods. This is also called a base flood.
100-year Flood Plain
The flood plain that would be inundated in the event of a 100-year flood.
Normal Year
A year during which the precipitation or stream flow approximates the average for a long period of record.
Water Year
The time period from October 1 through September 30.
Year
The period during which the Earth completes one revolution around the sun.

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