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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
4.0 mm
9:30am 25/06/2026
9:45am 25/06/2026
1 in 1 years
100.0 %
30m
6.0 mm
7:00am 25/06/2026
7:30am 25/06/2026
1 in 1 years
100.0 %
45m
8.5 mm
6:45am 25/06/2026
7:30am 25/06/2026
1 in 1 years
100.0 %
60m
10.0 mm
7:00am 25/06/2026
8:00am 25/06/2026
1 in 1 years
100.0 %
90m
15.0 mm
6:45am 25/06/2026
8:15am 25/06/2026
1 in 1.0 years
99.21 %
120m
18.0 mm
6:45am 25/06/2026
8:45am 25/06/2026
1 in 1.0 years
98.67 %
3h
23.5 mm
6:45am 25/06/2026
9:45am 25/06/2026
1 in 1.0 years
97.28 %
4h
31.5 mm
6:45am 25/06/2026
11:15am 25/06/2026
1 in 1.1 years
93.58 %
6h
35.0 mm
6:15am 25/06/2026
12:15pm 25/06/2026
1 in 1.1 years
94.45 %
9h
37.5 mm
3:15am 25/06/2026
12:15pm 25/06/2026
1 in 1.0 years
97.08 %
12h
41.0 mm
12:15am 25/06/2026
12:15pm 25/06/2026
1 in 1.0 years
97.85 %
18h
42.5 mm
7:15pm 24/06/2026
1:15pm 25/06/2026
1 in 1.0 years
98.98 %
24h
44.0 mm
11:15pm 24/06/2026
11:15pm 25/06/2026
1 in 1.0 years
99.5 %
30h
45.0 mm
5:15pm 24/06/2026
11:15pm 25/06/2026
1 in 1.0 years
99.78 %
36h
45.0 mm
11:15am 24/06/2026
11:15pm 25/06/2026
1 in 1.0 years
99.88 %
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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