Green Cape - IFD Analysis

Green Cape - IFD

2:20pm 17/05/2026 to 2:20pm 19/05/2026

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

12:30am 19/05/2026

12:40am 19/05/2026

1 in over 2000 years

< 0.05 %

20m

0.8 mm

5:40am 19/05/2026

6:00am 19/05/2026

1 in over 2000 years

< 0.05 %

30m

1.2 mm

5:40am 19/05/2026

6:10am 19/05/2026

1 in over 2000 years

< 0.05 %

60m

1.6 mm

5:10am 19/05/2026

6:10am 19/05/2026

1 in over 2000 years

< 0.05 %

90m

2.4 mm

4:40am 19/05/2026

6:10am 19/05/2026

1 in over 2000 years

< 0.05 %

120m

2.6 mm

4:10am 19/05/2026

6:10am 19/05/2026

1 in over 2000 years

< 0.05 %

3.2 mm

3:50am 19/05/2026

6:50am 19/05/2026

1 in over 2000 years

< 0.05 %

3.6 mm

1:40am 19/05/2026

6:10am 19/05/2026

1 in over 2000 years

< 0.05 %

4.8 mm

12:30am 19/05/2026

6:30am 19/05/2026

1 in over 2000 years

< 0.05 %

6.0 mm

11:40pm 18/05/2026

8:40am 19/05/2026

1 in over 2000 years

< 0.05 %

12h

6.4 mm

11:50pm 18/05/2026

11:50am 19/05/2026

1 in over 2000 years

< 0.05 %

18h

6.8 mm

8:20pm 18/05/2026

2:20pm 19/05/2026

1 in over 2000 years

< 0.05 %

24h

6.8 mm

2:20pm 18/05/2026

2:20pm 19/05/2026

1 in over 2000 years

< 0.05 %

30h

6.8 mm

8:20am 18/05/2026

2:20pm 19/05/2026

1 in over 2000 years

< 0.05 %

36h

6.8 mm

2:20am 18/05/2026

2:20pm 19/05/2026

1 in over 2000 years

< 0.05 %

48h

6.8 mm

2:20pm 17/05/2026

2:20pm 19/05/2026

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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