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Observations for this analysis :
Maximum observed rainfall by duration, estimated return period and AEP
Duration
Rainfall
Start
End
Years
AEP
10m
7.2 mm
11:10pm 15/06/2026
11:20pm 15/06/2026
1 in 1.0 years
99.92 %
20m
12.6 mm
11:00pm 15/06/2026
11:20pm 15/06/2026
1 in 1.0 years
98.97 %
30m
16.8 mm
10:50pm 15/06/2026
11:20pm 15/06/2026
1 in 1.0 years
98.17 %
60m
17.8 mm
10:20pm 15/06/2026
11:20pm 15/06/2026
1 in 1.0 years
99.51 %
90m
20.6 mm
10:10pm 15/06/2026
11:40pm 15/06/2026
1 in 1.0 years
99.41 %
120m
22.6 mm
10:10pm 15/06/2026
12:10am 16/06/2026
1 in 1.0 years
99.39 %
3h
27.8 mm
10:00pm 15/06/2026
1:00am 16/06/2026
1 in 1.0 years
98.87 %
4h
30.0 mm
8:50pm 15/06/2026
1:20am 16/06/2026
1 in 1.0 years
99.22 %
6h
35.2 mm
5:50pm 15/06/2026
11:50pm 15/06/2026
1 in 1.0 years
98.83 %
9h
43.6 mm
5:50pm 15/06/2026
2:50am 16/06/2026
1 in 1.0 years
98.4 %
12h
44.6 mm
4:20pm 15/06/2026
4:20am 16/06/2026
1 in 1.0 years
98.89 %
18h
53.8 mm
10:20am 15/06/2026
4:20am 16/06/2026
1 in 1.0 years
98.69 %
24h
53.8 mm
4:20am 15/06/2026
4:20am 16/06/2026
1 in 1.0 years
99.31 %
30h
53.8 mm
10:20pm 14/06/2026
4:20am 16/06/2026
1 in 1.0 years
99.76 %
36h
53.8 mm
4:20pm 14/06/2026
4:20am 16/06/2026
1 in 1.0 years
99.84 %
48h
53.8 mm
4:20am 14/06/2026
4:20am 16/06/2026
1 in 1.0 years
99.97 %
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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