Appendix C - Stormwater Management Plan

BOM IFDs Frequent and Infrequent Storm Events
Project number:                           20220213
Street Address:                           14-16 Reserve Street
Locality:                                 Pomona, NSC                                                                                                            Date:   19/09/2022

Source :                                  http://www.bom.gov.au/water/designRainfalls/revised-ifd/

Location:                                 Latitude                             -26.35652646
                                          Nearest Latitude            26.3625 (S)
                                          Longitude                             152.8590619
                                          Nearest Longitude           152.8625 (E)

Date obtained:                                        5/09/2022


                                            Annual Exceedance
                                             Probability (AEP)
Duration                                          63.20%                      50%#             20%*           10%           5%          2%          1%
1 min                                                          155                      175            237           277          315         364         401
2 min                                                          130                      147            199           235          271         319         357
3 min                                                          123                      138            187           221          254         298         332
4 min                                                          117                      132            179           210          241         281         312
5 min                                                          112                      127            171           201          230         267         295
10 min                                                        92.3                      104            140           164          186         214         235
15 min                                                        78.3                     88.4            119           139          157         181         199
20 min                                                        68.3                        77           104           121          137         158         174
25 min                                                        60.7                     68.5           92.3           108          123         142         156
30 min                                                        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        69.5        77.7
2 hour                                                        23.2                     26.3           36.1             43        49.8          59        66.1
3 hour                                                        17.9                     20.4           28.3          33.9         39.4          47        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            23        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         15.8         18.7        22.7        25.9
18 hour                                                       6.03                     7.05           10.4          12.7         15.1        18.5        21.1
24 hour                                                       5.05                     5.93             8.8         10.9           13        15.9        18.2
30 hour                                                       4.38                     5.16           7.71          9.55         11.4        14.1        16.2
36 hour                                                       3.89                     4.59           6.89          8.56         10.3        12.7        14.7
48 hour                                                         3.2                    3.78           5.72          7.14         8.61        10.7        12.4
72 hour                                                       2.39                     2.83             4.3           5.4        6.55        8.22          9.6
96 hour                                                       1.92                     2.27           3.45          4.34         5.29        6.66          7.8
120 hour                                                      1.62                       1.9          2.88          3.63         4.42        5.57        6.53
144 hour                                                        1.4                    1.64           2.47          3.11         3.79        4.76        5.57
168 hour                                                      1.23                     1.44           2.16          2.72         3.31        4.14        4.83


[OCR of page images]
 

 

BOM IFDs Frequent and Infrequent Storm Events

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Project number: 20220213,
street Address: 14-16 Reserve Street
Locality Pomona, NSC Date 19/09/2022
Source : http://www bom. gov.au/water/designRainfalls/revised-td/
Location: Latitude -26.35652646 tensity, “*AEP - Annual Exceedance Probability
Nearest Latitude 26.3625 (5) 5000 PET FRceerbOee Bes EOC
Longitude 152.8590619 t noon
Nearest Longitude 152.8625 (E) POON ones 4 + fee . 4 a a
as00 | senatibe amet ae [4
Date obtained: 5/09/2022 3000 F- : 3 eons —— mm
750
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Annual Exceedance "any (SES y eee : —— ox [J

Probability (AEP)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

  

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Duration 63.20% 50% 20%* 10% 5% 2%. 1%
155; 175; 237] 277 35; 364 401
130 147, 199 235] 27 319 357
123 138 187, 224 254 298] 332
117) 132 179) 210 241) 281 312
112 127] a7 203) 230 267 295]
92.3 104 140 164) 186 214 235;
78.3 88.4 119 139 157 181 199
68.3 77 104 121 137] 158] 174
60.7 68.5 92.3 108] 123 142] 156
54.9 61.9 83.5 97.7 uy 129 142]
[45 min 43.2 48.7 65.9 77.4 88.6 103; 14)
‘hour 36.1 40.7 55.3 65.2 74.9 87.7 97.5
1.5 hour 27.9 31.5 43.1 51d 59] 69.5 777
2 hour 23.2 26.3 36.1 43 49.8 59] 66.1
[3 hour 179 20.4 28.3 33.9 39.4 47 52.9
4.5 hour 13.9 15.9 22.4 26.9 315 37.7 42.6
[6 hour 17 13.4 19 23 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 B 15.8 18.7 2.7 25.9 aspera sess 2 4
18 hour 6.03 7.05 10.4 127 15.1 18.5 2d
[24 hour, 5.05 5.93 a 10.9 B 15.9 18.2 :
[30 hour, 4.38 5.16 771 9.55 ia 14.1 16.2 oz i oa +
[36 hour, 3.89 4.59 6.89 8.56 10.3 127 147
[48 hour 32 3.78 5.72 744 861 10.7 aa minutes hours I days
[72 hour, 2.39 2.83 43 sal 655 8.22 3.6]
[96 hour, 1.92 2.27 3.45 434 5.29 6.66 738 Duration
120 hour 1.62 19 2.88 3.63 442 557 653
144 hour 14 1.64 247 3 379 476 35u ‘©Copyright Commonwealth of Australia 2016, Bureau of Meteorology (ABN 92 637 533532)
168 hour 1.23 1.44 2.16 272 3.31 4.14 4.83