3:15am 18/01/2026 to 3:15am 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
31.0 mm
7:00pm 18/01/2026
7:15pm 18/01/2026
1 in 7.0 years
14.26 %
30m
45.0 mm
7:00pm 18/01/2026
7:30pm 18/01/2026
1 in 8.3 years
12.04 %
45m
50.0 mm
7:00pm 18/01/2026
7:45pm 18/01/2026
1 in 6.8 years
14.6 %
60m
52.0 mm
6:45pm 18/01/2026
7:45pm 18/01/2026
1 in 5.6 years
17.99 %
90m
55.0 mm
6:45pm 18/01/2026
8:15pm 18/01/2026
1 in 4.5 years
22.15 %
120m
58.0 mm
6:45pm 18/01/2026
8:45pm 18/01/2026
1 in 4.3 years
23.22 %
3h
61.0 mm
6:30pm 18/01/2026
9:30pm 18/01/2026
1 in 3.8 years
26.13 %
4h
61.0 mm
5:00pm 18/01/2026
9:30pm 18/01/2026
1 in 2.9 years
34.18 %
6h
61.0 mm
3:30pm 18/01/2026
9:30pm 18/01/2026
1 in 2.4 years
40.98 %
9h
61.0 mm
12:30pm 18/01/2026
9:30pm 18/01/2026
1 in 2.0 years
50.16 %
12h
61.0 mm
9:30am 18/01/2026
9:30pm 18/01/2026
1 in 1.8 years
57.14 %
18h
61.0 mm
3:30am 18/01/2026
9:30pm 18/01/2026
1 in 1.5 years
67.15 %
24h
61.0 mm
3:30am 18/01/2026
3:30am 19/01/2026
1 in 1.4 years
73.44 %
30h
61.0 mm
3:30am 18/01/2026
9:30am 19/01/2026
1 in 1.3 years
78.69 %
36h
61.0 mm
3:30am 18/01/2026
3:30pm 19/01/2026
1 in 1.2 years
83.11 %
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.