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