3:15pm 17/01/2026 to 3:15pm 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
17.0 mm
5:45pm 18/01/2026
6:00pm 18/01/2026
1 in 1.4 years
73.71 %
30m
24.0 mm
5:45pm 18/01/2026
6:15pm 18/01/2026
1 in 1.3 years
76.87 %
45m
26.0 mm
5:30pm 18/01/2026
6:15pm 18/01/2026
1 in 1.2 years
86.11 %
60m
27.0 mm
5:30pm 18/01/2026
6:30pm 18/01/2026
1 in 1.1 years
89.15 %
90m
27.0 mm
5:00pm 18/01/2026
6:30pm 18/01/2026
1 in 1.1 years
94.33 %
120m
27.0 mm
4:30pm 18/01/2026
6:30pm 18/01/2026
1 in 1.0 years
96.02 %
3h
27.0 mm
3:30pm 18/01/2026
6:30pm 18/01/2026
1 in 1.0 years
97.67 %
4h
27.0 mm
2:00pm 18/01/2026
6:30pm 18/01/2026
1 in 1.0 years
98.44 %
6h
30.0 mm
5:15pm 18/01/2026
11:15pm 18/01/2026
1 in 1.0 years
98.33 %
9h
30.0 mm
2:15pm 18/01/2026
11:15pm 18/01/2026
1 in 1.0 years
98.78 %
12h
31.0 mm
3:00pm 18/01/2026
3:00am 19/01/2026
1 in 1.0 years
99.0 %
18h
31.0 mm
9:00am 18/01/2026
3:00am 19/01/2026
1 in 1.0 years
99.55 %
24h
31.0 mm
3:00am 18/01/2026
3:00am 19/01/2026
1 in 1.0 years
99.8 %
30h
34.0 mm
5:15pm 17/01/2026
11:15pm 18/01/2026
1 in 1.0 years
99.8 %
36h
36.0 mm
3:30pm 17/01/2026
3:30am 19/01/2026
1 in 1.0 years
99.81 %
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.