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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
15m
1.0 mm
12:30pm 02/06/2026
12:45pm 02/06/2026
1 in 1 years
100.0 %
30m
1.4 mm
12:15pm 02/06/2026
12:45pm 02/06/2026
1 in 1 years
100.0 %
45m
1.4 mm
12:00pm 02/06/2026
12:45pm 02/06/2026
1 in 1 years
100.0 %
60m
1.4 mm
11:45am 02/06/2026
12:45pm 02/06/2026
1 in 1 years
100.0 %
90m
1.4 mm
11:15am 02/06/2026
12:45pm 02/06/2026
1 in 1 years
100.0 %
120m
1.8 mm
12:15pm 02/06/2026
2:15pm 02/06/2026
1 in 1 years
100.0 %
3h
1.8 mm
11:15am 02/06/2026
2:15pm 02/06/2026
1 in 1 years
100.0 %
4h
1.8 mm
9:45am 02/06/2026
2:15pm 02/06/2026
1 in 1 years
100.0 %
6h
1.8 mm
8:15am 02/06/2026
2:15pm 02/06/2026
1 in 1 years
100.0 %
9h
1.8 mm
5:15am 02/06/2026
2:15pm 02/06/2026
1 in 1 years
100.0 %
12h
1.8 mm
2:15am 02/06/2026
2:15pm 02/06/2026
1 in 1 years
100.0 %
18h
2.0 mm
6:30am 02/06/2026
12:30am 03/06/2026
1 in 1 years
100.0 %
24h
2.0 mm
12:30am 02/06/2026
12:30am 03/06/2026
1 in 1 years
100.0 %
30h
2.4 mm
8:15am 01/06/2026
2:15pm 02/06/2026
1 in 1 years
100.0 %
36h
2.4 mm
4:45am 01/06/2026
4:45pm 02/06/2026
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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