Willis Island - IFD Analysis

Willis Island - IFD

9:30pm 09/05/2026 to 9:30pm 11/05/2026

You can find out more about Design Rainfall and IFD here.

Observations for this analysis :

Maximum observed rainfall by duration, estimated return period and AEP

Duration

Rainfall

Start

End

Years

AEP

10m

0.4 mm

8:40am 10/05/2026

8:50am 10/05/2026

1 in over 2000 years

< 0.05 %

20m

0.4 mm

8:30am 10/05/2026

8:50am 10/05/2026

1 in over 2000 years

< 0.05 %

30m

0.4 mm

8:20am 10/05/2026

8:50am 10/05/2026

1 in over 2000 years

< 0.05 %

60m

0.4 mm

7:50am 10/05/2026

8:50am 10/05/2026

1 in over 2000 years

< 0.05 %

90m

0.4 mm

7:20am 10/05/2026

8:50am 10/05/2026

1 in over 2000 years

< 0.05 %

120m

0.4 mm

6:50am 10/05/2026

8:50am 10/05/2026

1 in over 2000 years

< 0.05 %

0.8 mm

8:50pm 10/05/2026

11:50pm 10/05/2026

1 in over 2000 years

< 0.05 %

0.8 mm

7:20pm 10/05/2026

11:50pm 10/05/2026

1 in over 2000 years

< 0.05 %

0.8 mm

5:50pm 10/05/2026

11:50pm 10/05/2026

1 in over 2000 years

< 0.05 %

0.8 mm

2:50pm 10/05/2026

11:50pm 10/05/2026

1 in over 2000 years

< 0.05 %

12h

0.8 mm

11:50am 10/05/2026

11:50pm 10/05/2026

1 in over 2000 years

< 0.05 %

18h

1.2 mm

8:40am 10/05/2026

2:40am 11/05/2026

1 in over 2000 years

< 0.05 %

24h

1.4 mm

11:50pm 09/05/2026

11:50pm 10/05/2026

1 in over 2000 years

< 0.05 %

30h

1.4 mm

9:30pm 09/05/2026

3:30am 11/05/2026

1 in over 2000 years

< 0.05 %

36h

1.4 mm

9:30pm 09/05/2026

9:30am 11/05/2026

1 in over 2000 years

< 0.05 %

48h

1.4 mm

9:30pm 09/05/2026

9:30pm 11/05/2026

1 in over 2000 years

< 0.05 %

Note: A '1 in 1.0 years' estimate means that it is almost certain to occur at least once in a year, and could occur much more than once per year on average. For smaller values like this the Annual Recurrance Interval (ARI) may be of more relevance, but it is complex to calculate for common events.

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