Dark mode
Light mode 2:45pm 16/05/2026 to 2:45pm 18/05/2026
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
9.0 mm
12:00pm 18/05/2026
12:15pm 18/05/2026
1 in 1.0 years
99.82 %
30m
16.0 mm
11:45am 18/05/2026
12:15pm 18/05/2026
1 in 1.0 years
98.35 %
45m
21.0 mm
11:45am 18/05/2026
12:30pm 18/05/2026
1 in 1.0 years
96.05 %
60m
27.0 mm
11:45am 18/05/2026
12:45pm 18/05/2026
1 in 1.1 years
89.35 %
90m
39.0 mm
11:45am 18/05/2026
1:15pm 18/05/2026
1 in 1.5 years
68.55 %
120m
46.0 mm
11:30am 18/05/2026
1:30pm 18/05/2026
1 in 1.6 years
63.78 %
3h
64.0 mm
11:30am 18/05/2026
2:30pm 18/05/2026
1 in 2.1 years
47.7 %
4h
76.0 mm
10:00am 18/05/2026
2:30pm 18/05/2026
1 in 2.0 years
49.4 %
6h
85.0 mm
8:30am 18/05/2026
2:30pm 18/05/2026
1 in 1.9 years
51.85 %
9h
109.0 mm
5:30am 18/05/2026
2:30pm 18/05/2026
1 in 2.1 years
47.96 %
12h
137.0 mm
2:30am 18/05/2026
2:30pm 18/05/2026
1 in 2.5 years
39.99 %
18h
141.0 mm
8:30pm 17/05/2026
2:30pm 18/05/2026
1 in 1.8 years
56.24 %
24h
141.0 mm
2:30pm 17/05/2026
2:30pm 18/05/2026
1 in 1.5 years
66.7 %
30h
141.0 mm
8:30am 17/05/2026
2:30pm 18/05/2026
1 in 1.4 years
73.49 %
36h
142.0 mm
2:30am 17/05/2026
2:30pm 18/05/2026
1 in 1.3 years
78.88 %
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.
Install
