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Observations for this analysis :
Maximum observed rainfall by duration, estimated return period and AEP
Duration
Rainfall
Start
End
Years
AEP
15m
5.0 mm
6:00pm 30/05/2026
6:15pm 30/05/2026
1 in 1.0 years
98.75 %
30m
7.0 mm
5:45pm 30/05/2026
6:15pm 30/05/2026
1 in 1.0 years
98.37 %
45m
8.6 mm
5:45pm 30/05/2026
6:30pm 30/05/2026
1 in 1.0 years
97.54 %
60m
9.4 mm
5:30pm 30/05/2026
6:30pm 30/05/2026
1 in 1.0 years
98.21 %
90m
10.8 mm
5:15pm 30/05/2026
6:45pm 30/05/2026
1 in 1.0 years
98.43 %
120m
11.2 mm
4:45pm 30/05/2026
6:45pm 30/05/2026
1 in 1.0 years
99.13 %
3h
12.2 mm
5:30pm 30/05/2026
8:30pm 30/05/2026
1 in 1.0 years
99.77 %
4h
14.8 mm
5:15pm 30/05/2026
9:45pm 30/05/2026
1 in 1.0 years
99.36 %
6h
15.8 mm
4:15pm 30/05/2026
10:15pm 30/05/2026
1 in 1.0 years
99.75 %
9h
18.2 mm
4:15pm 30/05/2026
1:15am 31/05/2026
1 in 1.0 years
99.7 %
12h
19.8 mm
4:30pm 30/05/2026
4:30am 31/05/2026
1 in 1.0 years
99.76 %
18h
17.2 mm
6:00am 30/05/2026
12:00am 31/05/2026
1 in 1 years
100.0 %
24h
20.8 mm
6:00am 30/05/2026
6:00am 31/05/2026
1 in 1 years
100.0 %
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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