MHB Flood Frequency & Return Interval: 100-Year Analysis

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Flood frequency can be calculated by dividing the number of floods by the total years of record, resulting in a frequency of 5 floods per 100 years, or 1 flood every 20 years on average. However, this average does not guarantee that floods will occur at regular intervals. The return interval is a statistical estimate and can vary significantly over time. Therefore, while the average suggests a flood every 20 years, actual occurrences may differ. Understanding these concepts is crucial for effective flood risk management.
Varanus
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if in 100 years of records you have had floods in five of those years is the flood frequency 5 per 100 years ?

and would the flood return interval be every 20 years?
 
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Yes, the frequency is 5/100= 1/20 years per flood. There will be an average of one flood every 20 year but that is only an average.
 

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