No | Standard (AS/NZS 4360) | Definition |
F1 | Frequent | Incidents likely to occur once in a week up to once a year |
F2 | Likely | Incidents likely to occur once in a year up to once every 10 years |
F3 | Possible | Incidents likely to occur once in 10 years up to once in 100 years |
F4 | Unlikely | Incidents likely to occur once in 100 years |
F5 | Rare | Incidents likely to occur less than once in 100 years in a port world-wide |