4:30pm 17/01/2026 to 4:30pm 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
6.0 mm
6:30am 18/01/2026
6:45am 18/01/2026
1 in 1.0 years
99.94 %
30m
9.0 mm
12:30am 18/01/2026
1:00am 18/01/2026
1 in 1.0 years
99.8 %
45m
12.0 mm
12:15am 18/01/2026
1:00am 18/01/2026
1 in 1.0 years
99.22 %
60m
15.0 mm
9:00pm 17/01/2026
10:00pm 17/01/2026
1 in 1.0 years
98.56 %
90m
21.0 mm
9:00pm 17/01/2026
10:30pm 17/01/2026
1 in 1.0 years
96.11 %
120m
25.0 mm
5:30pm 17/01/2026
7:30pm 17/01/2026
1 in 1.0 years
95.36 %
3h
37.0 mm
12:30am 18/01/2026
3:30am 18/01/2026
1 in 1.1 years
87.29 %
4h
54.0 mm
5:30pm 17/01/2026
10:00pm 17/01/2026
1 in 1.3 years
74.78 %
6h
70.0 mm
9:00pm 17/01/2026
3:00am 18/01/2026
1 in 1.5 years
67.77 %
9h
103.0 mm
6:00pm 17/01/2026
3:00am 18/01/2026
1 in 1.8 years
55.59 %
12h
129.0 mm
5:00pm 17/01/2026
5:00am 18/01/2026
1 in 2.0 years
50.61 %
18h
142.0 mm
4:45pm 17/01/2026
10:45am 18/01/2026
1 in 1.6 years
61.18 %
24h
145.0 mm
4:45pm 17/01/2026
4:45pm 18/01/2026
1 in 1.4 years
69.23 %
30h
146.0 mm
4:45pm 17/01/2026
10:45pm 18/01/2026
1 in 1.3 years
75.01 %
36h
147.0 mm
4:45pm 17/01/2026
4:45am 19/01/2026
1 in 1.3 years
78.98 %
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.