3:45am 18/01/2026 to 3:45am 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
10.6 mm
7:45am 18/01/2026
8:00am 18/01/2026
1 in 1.1 years
92.54 %
30m
19.0 mm
8:15am 18/01/2026
8:45am 18/01/2026
1 in 1.4 years
71.07 %
45m
23.6 mm
7:45am 18/01/2026
8:30am 18/01/2026
1 in 1.5 years
65.21 %
60m
32.0 mm
7:45am 18/01/2026
8:45am 18/01/2026
1 in 2.3 years
43.9 %
90m
41.4 mm
7:45am 18/01/2026
9:15am 18/01/2026
1 in 3.2 years
31.42 %
120m
48.0 mm
7:15am 18/01/2026
9:15am 18/01/2026
1 in 3.7 years
27.19 %
3h
55.4 mm
6:30am 18/01/2026
9:30am 18/01/2026
1 in 3.6 years
28.07 %
4h
58.0 mm
5:00am 18/01/2026
9:30am 18/01/2026
1 in 2.5 years
40.45 %
6h
65.8 mm
6:45am 18/01/2026
12:45pm 18/01/2026
1 in 2.5 years
40.74 %
9h
75.6 mm
4:45am 18/01/2026
1:45pm 18/01/2026
1 in 2.2 years
46.13 %
12h
76.8 mm
4:45am 18/01/2026
4:45pm 18/01/2026
1 in 1.7 years
59.13 %
18h
78.0 mm
4:15am 18/01/2026
10:15pm 18/01/2026
1 in 1.3 years
74.85 %
24h
87.8 mm
4:45am 18/01/2026
4:45am 19/01/2026
1 in 1.3 years
76.33 %
30h
90.0 mm
4:15am 18/01/2026
10:15am 19/01/2026
1 in 1.2 years
83.05 %
36h
90.0 mm
4:15am 18/01/2026
4:15pm 19/01/2026
1 in 1.1 years
88.2 %
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.