4:45pm 17/01/2026 to 4:45pm 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
16.0 mm
12:30am 18/01/2026
12:45am 18/01/2026
1 in 2.1 years
48.55 %
30m
23.0 mm
12:30am 18/01/2026
1:00am 18/01/2026
1 in 2.4 years
41.79 %
45m
23.0 mm
12:15am 18/01/2026
1:00am 18/01/2026
1 in 1.8 years
56.97 %
60m
29.0 mm
12:30am 18/01/2026
1:30am 18/01/2026
1 in 2.4 years
42.5 %
90m
46.0 mm
12:30am 18/01/2026
2:00am 18/01/2026
1 in 7.9 years
12.62 %
120m
49.0 mm
12:30am 18/01/2026
2:30am 18/01/2026
1 in 7.1 years
14.12 %
3h
51.0 mm
12:15am 18/01/2026
3:15am 18/01/2026
1 in 4.7 years
21.49 %
4h
63.0 mm
12:30am 18/01/2026
5:00am 18/01/2026
1 in 5.8 years
17.1 %
6h
74.0 mm
12:30am 18/01/2026
6:30am 18/01/2026
1 in 6.8 years
14.64 %
9h
78.0 mm
12:15am 18/01/2026
9:15am 18/01/2026
1 in 4.1 years
24.45 %
12h
80.0 mm
9:15pm 17/01/2026
9:15am 18/01/2026
1 in 2.9 years
34.81 %
18h
82.0 mm
5:00pm 17/01/2026
11:00am 18/01/2026
1 in 2.0 years
51.25 %
24h
83.0 mm
5:00pm 17/01/2026
5:00pm 18/01/2026
1 in 1.6 years
62.41 %
30h
83.0 mm
5:00pm 17/01/2026
11:00pm 18/01/2026
1 in 1.5 years
68.86 %
36h
86.0 mm
9:00pm 17/01/2026
9:00am 19/01/2026
1 in 1.4 years
71.15 %
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.