AEP/ARI Utility

Calculate Equivalent Annual Exceedance Probability (AEP)

Enter Continental U.S. Location Information

Latitude
Enter latitude in decimal degrees
-
+
Longitude
Enter longitude in decimal degrees; use -1 for West (e.g. -104)
-
+

Enter Precipitation Information

Precipitation (inches)
Enter precipitation amount
-
+
Duration (hours)
Select desired duration
  • 24 hours
  • 24 hours

Calculate Precipitation For an Equivalent Annual Exceedance Probability (AEP)

Enter Continental U.S. Location Information

Latitude
Enter latitude in decimal degrees
-
+
Longitude
Enter longitude in decimal degrees; use -1 for West (e.g. -104)
-
+

Enter AEP Information

Duration (hours)
Select desired duration
  • 24 hours
  • 24 hours
Annual Exceedance Probability (AEP)
Select desired AEP
  • 1 (100% chance;1 year ARI)
  • 1 (100% chance;1 year ARI)
  • 0.5 (50% chance;2 year ARI)
  • 0.2 (20% chance;5 year ARI)
  • 0.1 (10% chance;10 year ARI)
  • 0.04 (4% chance; 25 year ARI)
  • 0.02 (2% chance; 50 year ARI)
  • 0.01 (1% chance;100 year ARI)
  • 0.005 (0.5% chance;200 year ARI)
  • 0.002 (0.2% chance;500 year ARI)
  • 0.001 (0.1% chance; 1000 year ARI)