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
0.2 mm
1:45pm 13/06/2026
2:00pm 13/06/2026
1 in 1 years
100.0 %
30m
0.4 mm
1:45pm 13/06/2026
2:15pm 13/06/2026
1 in 1 years
100.0 %
45m
0.4 mm
1:45pm 13/06/2026
2:30pm 13/06/2026
1 in 1 years
100.0 %
60m
0.6 mm
1:45pm 13/06/2026
2:45pm 13/06/2026
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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You can find out more about Design Rainfall and IFD here.
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