4:00pm 17/01/2026 to 4:00pm 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
17.0 mm
1:30pm 18/01/2026
1:45pm 18/01/2026
1 in 1.9 years
52.73 %
30m
31.0 mm
1:15pm 18/01/2026
1:45pm 18/01/2026
1 in 4.1 years
24.49 %
45m
42.0 mm
1:15pm 18/01/2026
2:00pm 18/01/2026
1 in 7.0 years
14.29 %
60m
46.0 mm
1:15pm 18/01/2026
2:15pm 18/01/2026
1 in 6.8 years
14.74 %
90m
49.0 mm
12:45pm 18/01/2026
2:15pm 18/01/2026
1 in 5.1 years
19.61 %
120m
53.0 mm
12:30pm 18/01/2026
2:30pm 18/01/2026
1 in 4.7 years
21.15 %
3h
57.0 mm
12:30pm 18/01/2026
3:30pm 18/01/2026
1 in 3.7 years
26.87 %
4h
59.0 mm
11:15am 18/01/2026
3:45pm 18/01/2026
1 in 2.5 years
40.41 %
6h
61.0 mm
9:45am 18/01/2026
3:45pm 18/01/2026
1 in 2.0 years
50.32 %
9h
64.0 mm
6:45am 18/01/2026
3:45pm 18/01/2026
1 in 1.5 years
65.63 %
12h
65.0 mm
3:45am 18/01/2026
3:45pm 18/01/2026
1 in 1.3 years
76.95 %
18h
69.0 mm
8:45pm 17/01/2026
2:45pm 18/01/2026
1 in 1.1 years
88.4 %
24h
75.0 mm
8:00pm 17/01/2026
8:00pm 18/01/2026
1 in 1.1 years
90.61 %
30h
76.0 mm
5:45pm 17/01/2026
11:45pm 18/01/2026
1 in 1.1 years
94.51 %
36h
76.0 mm
4:15pm 17/01/2026
4:15am 19/01/2026
1 in 1.0 years
96.33 %
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.