4:15am 18/01/2026 to 4:15am 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
16.0 mm
6:45pm 18/01/2026
7:00pm 18/01/2026
1 in 1.4 years
72.36 %
30m
31.0 mm
6:45pm 18/01/2026
7:15pm 18/01/2026
1 in 2.5 years
40.23 %
45m
33.0 mm
6:45pm 18/01/2026
7:30pm 18/01/2026
1 in 2.0 years
48.96 %
60m
38.0 mm
6:45pm 18/01/2026
7:45pm 18/01/2026
1 in 2.3 years
43.69 %
90m
50.0 mm
6:45pm 18/01/2026
8:15pm 18/01/2026
1 in 3.7 years
27.37 %
120m
55.0 mm
6:45pm 18/01/2026
8:45pm 18/01/2026
1 in 4.0 years
25.27 %
3h
56.0 mm
6:00pm 18/01/2026
9:00pm 18/01/2026
1 in 3.2 years
31.71 %
4h
56.0 mm
4:30pm 18/01/2026
9:00pm 18/01/2026
1 in 2.4 years
41.16 %
6h
56.0 mm
3:00pm 18/01/2026
9:00pm 18/01/2026
1 in 2.1 years
47.56 %
9h
56.0 mm
12:00pm 18/01/2026
9:00pm 18/01/2026
1 in 1.7 years
57.32 %
12h
56.0 mm
9:00am 18/01/2026
9:00pm 18/01/2026
1 in 1.5 years
64.79 %
18h
56.0 mm
4:30am 18/01/2026
10:30pm 18/01/2026
1 in 1.4 years
73.65 %
24h
56.0 mm
4:30am 18/01/2026
4:30am 19/01/2026
1 in 1.2 years
80.77 %
30h
56.0 mm
4:30am 18/01/2026
10:30am 19/01/2026
1 in 1.2 years
86.47 %
36h
56.0 mm
4:30am 18/01/2026
4:30pm 19/01/2026
1 in 1.1 years
88.5 %
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.