RFI - SWMP.pdf

11/23/21, 12:12 PM                              Rainfall IFD Data System: Water Information: Bureau of Meteorology




    Location
    Label:           Not provided
    Latitude: -26.406 [Nearest grid cell: 26.4125 (S)]
    Longitude:153.05 [Nearest grid cell: 153.0625 (E)]

    IFD Design Rainfall Intensity (mm/h)                                                      Issued: 23 November 2021

    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%

     1 min                              171         194          263          308          350           405          446

     2 min                              145         165          228          272          314           372          417

     3 min                              137         155          214          253          292           344          384

     4 min                              130         148          202          239          274           320          356

     5 min                              124         141          192          226          259           301          332

     10 min                             102         115          155          181          205           236          259

     15 min                            86.3        97.5          131          153          173           199          218

     20 min                            75.3        85.1          115          134          152           175          192

     25 min                            67.1        75.9          103          120          136           157          173

     30 min                            60.8        68.8         93.2          109          124           144          159

     45 min                            48.1        54.5         74.5         87.8          101           117          130

     1 hour                            40.4        45.9         63.1         74.8          86.1          101          113

     1.5 hour                          31.3        35.8         49.8         59.4          68.9         81.6          91.4

     2 hour                            26.1        29.9         42.1         50.4          58.8         70.0          78.7

     3 hour                            20.3        23.3         33.2         40.1          47.0         56.3          63.7

     4.5 hour                          15.8        18.2         26.3         31.9          37.6         45.3          51.4

     6 hour                            13.2        15.4         22.3         27.2          32.1         38.9          44.2

     9 hour                            10.3        12.1         17.7         21.7          25.7         31.2          35.6

     12 hour                           8.69        10.2         15.0         18.4          21.9         26.7          30.5

     18 hour                           6.78        7.95         11.8         14.6          17.4         21.3          24.4


    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.



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