Appendix C - Engineering Report

Australian Government

os =
oie mem Cocceae

 

Location

Label: Pomona
Latitude: -26.371 [Nearest grid cell: 26.3625 (S)]
Longitude:152.8505 [Nearest grid cell: 152.8625 (E)]

IFD Design Rainfall Intensity (mm/h) Issued: 19 May 2022

Rainfall intensity for Durations, Exceedance per Year (EY), and Annual Exceedance Probabilities (AEP).
FAQ for New ARR probability terminology

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Annual Exceedance Probability (AEP)
Duration 63.2% | 50%# | 20%* 10% 5% 2% 1%
155 175 237 277 315 364 401
130 147 199 235 271 319 357
123 138 187 221 254 298 332
117 132 179 210 241 281 312
112 127 171 201 230 267 295
99.5 112 151 177 201 232 255
95.8 108 146 170 193 223 245
92.3 104 140 164 186 214 235
83.3 94.1 127 148 168 193 211
78.3 88.4 119 139 157 181 199
70.0 79.0 106 124 141 162 178
68.3 77.0 104 121 137 158 174
60.7 68.5 92.3 108 123 142 156
54.9 61.9 83.5 97.7 111 129 142
45 min 43.2 48.7 65.9 77.4 88.6 103 114
1 hour 36.1 40.7 55.3 65.2 74.9 87.7 97.5
1.5 hour 27.9 31.5 43.1 51.1 59.0 69.5 77.7
2 hour 23.2 26.3 36.1 43.0 49.8 59.0 66.1
3 hour 17.9 20.4 28.3 33.9 39.4 47.0 52.9
4.5 hour 13.9 15.9 22.4 26.9 31.5 37.7 42.6
6 hour 11.7 13.4 19.0 23.0 26.9 32.4 36.7
9 hour 9.13 10.6 15.2 18.5 21.8 26.3 29.8
12 hour 7.69 8.94 13.0 15.8 18.7 22.7 25.9
18 hour 6.03 7.05 10.4 12.7 15.1 18.5 21.1

 

 

 

 

 

 

 

 

 

 

Note:

# The 50% AEP IFD does not correspond to the 2 year Average Recurrence Interval (ARI) IFD.
Rather it corresponds to the 1.44 ARI.

* The 20% AEP IFD does not correspond to the 5 year Average Recurrence Interval (ARI) IFD.
Rather it corresponds to the 4.48 ARI.