4:15pm 17/01/2026 to 4:15pm 19/01/2026
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
16.6 mm
5:45am 18/01/2026
6:00am 18/01/2026
1 in 1.6 years
63.74 %
30m
31.6 mm
5:45am 18/01/2026
6:15am 18/01/2026
1 in 3.7 years
27.3 %
45m
38.0 mm
5:45am 18/01/2026
6:30am 18/01/2026
1 in 4.0 years
24.8 %
60m
40.8 mm
5:30am 18/01/2026
6:30am 18/01/2026
1 in 3.6 years
28.14 %
90m
47.4 mm
5:00am 18/01/2026
6:30am 18/01/2026
1 in 3.6 years
27.52 %
120m
53.0 mm
5:00am 18/01/2026
7:00am 18/01/2026
1 in 3.8 years
26.66 %
3h
55.8 mm
4:30am 18/01/2026
7:30am 18/01/2026
1 in 2.6 years
38.3 %
4h
56.4 mm
4:45am 18/01/2026
9:15am 18/01/2026
1 in 1.9 years
53.36 %
6h
56.6 mm
4:30am 18/01/2026
10:30am 18/01/2026
1 in 1.5 years
65.52 %
9h
61.2 mm
10:15pm 17/01/2026
7:15am 18/01/2026
1 in 1.4 years
72.11 %
12h
84.4 mm
7:15pm 17/01/2026
7:15am 18/01/2026
1 in 1.9 years
51.73 %
18h
86.0 mm
4:30pm 17/01/2026
10:30am 18/01/2026
1 in 1.5 years
66.4 %
24h
86.0 mm
4:30pm 17/01/2026
4:30pm 18/01/2026
1 in 1.3 years
75.28 %
30h
89.6 mm
7:15pm 17/01/2026
1:15am 19/01/2026
1 in 1.3 years
78.63 %
36h
93.6 mm
7:15pm 17/01/2026
7:15am 19/01/2026
1 in 1.2 years
80.28 %
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.