2:30am 18/01/2026 to 2:30am 20/01/2026
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
24.0 mm
7:45pm 18/01/2026
8:00pm 18/01/2026
1 in 2.9 years
34.4 %
30m
44.0 mm
7:45pm 18/01/2026
8:15pm 18/01/2026
1 in 8.5 years
11.74 %
45m
52.0 mm
7:30pm 18/01/2026
8:15pm 18/01/2026
1 in 9.2 years
10.82 %
60m
60.0 mm
7:30pm 18/01/2026
8:30pm 18/01/2026
1 in 11.9 years
8.4 %
90m
63.0 mm
7:30pm 18/01/2026
9:00pm 18/01/2026
1 in 9.2 years
10.86 %
120m
66.0 mm
7:30pm 18/01/2026
9:30pm 18/01/2026
1 in 8.6 years
11.62 %
3h
68.0 mm
7:00pm 18/01/2026
10:00pm 18/01/2026
1 in 7.0 years
14.2 %
4h
68.0 mm
5:30pm 18/01/2026
10:00pm 18/01/2026
1 in 5.1 years
19.72 %
6h
68.0 mm
4:00pm 18/01/2026
10:00pm 18/01/2026
1 in 4.1 years
24.2 %
9h
68.0 mm
1:00pm 18/01/2026
10:00pm 18/01/2026
1 in 3.0 years
33.32 %
12h
68.0 mm
10:00am 18/01/2026
10:00pm 18/01/2026
1 in 2.4 years
41.5 %
18h
68.0 mm
4:00am 18/01/2026
10:00pm 18/01/2026
1 in 1.9 years
52.36 %
24h
68.0 mm
2:45am 18/01/2026
2:45am 19/01/2026
1 in 1.6 years
61.48 %
30h
68.0 mm
2:45am 18/01/2026
8:45am 19/01/2026
1 in 1.5 years
66.98 %
36h
68.0 mm
2:45am 18/01/2026
2:45pm 19/01/2026
1 in 1.4 years
71.12 %
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.