Enter the rank of the inflow value and the total number of events or data points into the Calculator. The calculator will evaluate the Annual Exceedance Probability. 

Annual Exceedance Probability Formula

AEP = m/(n+1)*100

Variables:

  • AEP is the Annual Exceedance Probability (%)
  • m is the rank of the inflow value
  • n is the total number of events or data points

To calculate Annual Exceedance Probability, divide the rank of inflow value by the sum of the total number of events plus 1, then multiply the result by 100.

How to Calculate Annual Exceedance Probability?

The following steps outline how to calculate the Annual Exceedance Probability.

  1. First, determine the rank of the inflow value. 
  2. Next, determine the total number of events or data points. 
  3. Next, gather the formula from above = AEP = m/(n+1)*100.
  4. Finally, calculate the Annual Exceedance Probability.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

rank of the inflow value = 67

total number of events or data points = 80