Lady Elliot Island - IFD Analysis

Lady Elliot Island - IFD

8:50pm 11/05/2026 to 8:50pm 13/05/2026

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

4.6 mm

6:40pm 13/05/2026

6:50pm 13/05/2026

1 in over 2000 years

< 0.05 %

20m

6.2 mm

6:30pm 13/05/2026

6:50pm 13/05/2026

1 in over 2000 years

< 0.05 %

30m

8.0 mm

6:20pm 13/05/2026

6:50pm 13/05/2026

1 in over 2000 years

< 0.05 %

60m

11.0 mm

6:10pm 13/05/2026

7:10pm 13/05/2026

1 in over 2000 years

< 0.05 %

90m

11.6 mm

5:50pm 13/05/2026

7:20pm 13/05/2026

1 in over 2000 years

< 0.05 %

120m

11.6 mm

5:20pm 13/05/2026

7:20pm 13/05/2026

1 in over 2000 years

< 0.05 %

11.8 mm

4:20pm 13/05/2026

7:20pm 13/05/2026

1 in over 2000 years

< 0.05 %

13.0 mm

2:50pm 13/05/2026

7:20pm 13/05/2026

1 in over 2000 years

< 0.05 %

13.2 mm

1:20pm 13/05/2026

7:20pm 13/05/2026

1 in over 2000 years

< 0.05 %

13.2 mm

10:20am 13/05/2026

7:20pm 13/05/2026

1 in over 2000 years

< 0.05 %

12h

13.4 mm

7:20am 13/05/2026

7:20pm 13/05/2026

1 in over 2000 years

< 0.05 %

18h

14.6 mm

1:20am 13/05/2026

7:20pm 13/05/2026

1 in over 2000 years

< 0.05 %

24h

18.4 mm

7:50pm 12/05/2026

7:50pm 13/05/2026

1 in over 2000 years

< 0.05 %

30h

19.2 mm

2:50pm 12/05/2026

8:50pm 13/05/2026

1 in over 2000 years

< 0.05 %

36h

20.2 mm

8:50am 12/05/2026

8:50pm 13/05/2026

1 in over 2000 years

< 0.05 %

48h

22.8 mm

8:50pm 11/05/2026

8:50pm 13/05/2026

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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Last 4 days of AWS, rain gauge and river height observations
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