Magnitude and frequency principle

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Magnitude and frequency principle is theory that events may be calculated on their occurrence by the possibly severity of the event. The higher the magnitude of the event, the less it is likely to occur, closely related to statistics. Less severe events are more likely to occur on a regular basis than a dramatic event.

This theory is also used to catagorize weather events and natural disasters. For example a 100-year flood in a given area has a 1% chance of occurring during any given year. Where a 10-year flood has a 10% chance of occurring during any given year. The chance of a single event is not exclusive, it is possible for a similar event to occur in the same year or in the following years.