RFI - stormwater report

      RATIONAL METHOD SUMMARY & RAINFALL DATA
      Project   Pottery Street, Pomona
      Project # 2016 IFD Existing REGIONAL

      Rainfall IFD Input Data (Australian Rainfall and Runoff)

           2              2                2               50           50            50
            I1             I12              I72              I1            I12          I72          F2            F50     G




      Rainfall Intensity (mm/hr)

            DURATION                                       AVERAGE RECURRENCE INTERVAL (years)
        (hours) (minutes)                 1 yr            2 yr    5 yr   10 yr   20 yr    50 yr                          100 yr
         0.083     5                      109             123     166    194     222      258                             285
          0.1      6                      105             118     159    186     212      246                             271
         0.167     10                      90             102     137    160     181      209                             229
         0.25      15                      77              86     116    135     154      177                             194
         0.333     20                      67              75     101    118     134      155                             170
         0.417     25                      59              67     90     105     119      138                             152
          0.5      30                      53              60     81      95     108      125                             138
         0.75      45                     41.9            47.2    64      75      86      100                             110
           1       60                     34.9            39.3    53      63      72       84                              94
          1.5      90                     26.8            30.3   41.3    48.9     56       66                              74
           2      120                     22.3            25.2   34.5    41.0    47.4      56                              63
           3      180                     17.2            19.5   27.0    32.2    37.5     44.6                             50
          4.5     270                     13.3            15.2   21.3    25.6    29.9     35.8                            40.4
           6      360                     11.2            12.8   18.1    21.9    25.7     30.8                            34.9
           9      540                     8.79            10.2   14.6    17.7    20.8     25.2                            28.6
          12      720                     7.43            8.63   12.5    15.3    18.0     21.9                            24.9
          18      1080                    5.86            6.86   10.1    12.4    14.7     18.0                            20.5




      Catchment Data

      Details:      2016 IFD Exsiting REGIONAL

       Variable         Value             Units           29.0      Bransby Williams
         Area:         33.658              ha
          C10           0.59            fraction


      Rational Method Summary

        Adopted Time of Concentration (tc)                29.0      Minutes (or 0.48 hours)

                                                          AVERAGE RECURRENCE INTERVAL (years)
              Variable                    1 yr            2 yr   5 yr   10 yr   20 yr    50 yr                           100 yr
             Freq Factor                 0.80            0.85   0.95    1.00    1.05     1.15                             1.20
          Intensity (mm/hr)              54.43           61.36  82.65  96.62   109.97   127.32                           140.50
                       3
          Discharge (m /s)               2.404           2.879  4.335  5.334    6.374   8.083                            9.308




H:\19\19-0155 Aquaintel Project Work\2020023_30PotteryStreetSWMP\Hydrology\Rational_Method_Pottery_REGIONAL.xlsm                  28/07/2020


[OCR of page images]
RATIONAL METHOD SUMMARY & RAINFALL DATA

Project Pottery Street, Pomona
Project # 2016 IFD Existing REGIONAL

Rainfall IFD Input Data (Australian Rainfall and Runoff)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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Rainfall Intensity (mm/hr
DURATION AVERAGE RECURRENCE INTERVAL (years)
(hours) | (minutes) 1 yr 2 yr 5 yr 10 yr 20 yr 50 yr 100 yr
0.083 5 109 123 166 194 222 258 285
0.1 6 105 118 159 186 212 246 271
0.167 10 90 102 137 160 181 209 229
0.25 15 77 86 116 135 154 177 194
0.333 20 67 75 101 118 134 155 170
0.417 25 59 67 90 105 119 138 152
0.5 30 53 60 81 95 108 125 138
0.75 45 41.9 47.2 64 75 86 100 110
1 60 34.9 39.3 53 63 72 84 94
1.5 90 26.8 30.3 41.3 48.9 56 66 74
2 120 22.3 25.2 34.5 41.0 47.4 56 63
3 180 17.2 19.5 27.0 32.2 37.5 44.6 50
4.5 270 13.3 15.2 21.3 25.6 29.9 35.8 40.4
6 360 11.2 12.8 18.1 21.9 25.7 30.8 34.9
9 540 8.79 10.2 14.6 17.7 20.8 25.2 28.6
12 720 7.43 8.63 12.5 15.3 18.0 21.9 24.9
18 1080 5.86 6.86 10.1 12.4 14.7 18.0 20.5

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Catchment Data

Details: 2016 IFD Exsiting REGIONAL

 

 

 

 

Variable Value Units 29.0  Bransby Williams
Area: 33.658 ha
Cio 0.59 fraction

 

 

 

 

 

Rational Method Summary

Adopted Time of Concentration (tc) 29.0 _ Minutes (or 0.48 hours)

 

 

 

 

 

 

AVERAGE RECURRENCE INTERVAL (years)
Variable Tyr 2 yr 5 yr 10 yr 20 yr 30 yr T00 yr
Freq Factor 0.80 0.85 0.95 1.00 1.05 1.15 1.20
Intensity (mm/hr) 54.43 61.36 82.65 96.62 109.97 127.32 140.50
Discharge (m*/s) 2.404 2.879 4.335 5.334 6.374 8.083 9.308

 

 

 

 

 

 

 

 

 

H:\19\19-0155 Aquaintel Project Work\2020023_30PotteryStreetSWMP\Hydrology\Rational_Method_Pottery REGIONAL.xism

28/07/2020