RFI - stormwater report

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

      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

        Variable         Value             Units            6.00      Standard inlet time
          Area:          1.256              ha
           C10           0.59            fraction


      Rational Method Summary

         Adopted Time of Concentration (tc)                 6.00      Minutes (or 0.10 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)               105.00          118.00  159.00 186.00  212.00   246.00                     271.00
                       3
          Discharge (m /s)                0.173           0.207   0.311  0.383    0.459   0.583                      0.670




H:\19\19-0155 Aquaintel Project Work\2020023_30PotteryStreetSWMP\Hydrology\Rational_Method_Pottery.xlsm                       23/07/2020


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

Project Pottery Street, Pomona
Project # 2016 IFD Existing

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

 

 

 

 

Variable Value Units 6.00 Standard inlet time
Area: 1.256 ha
Cio 0.59 fraction

 

 

 

 

 

Rational Method Summary

Adopted Time of Concentration (tc) 6.00 Minutes (or 0.10 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) 105.00 118.00 159.00 186.00 212.00 246.00 271.00
Discharge (m*/s) 0.173 0.207 0.311 0.383 0.459 0.583 0.670

 

 

 

 

 

 

 

 

 

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

23/07/2020