Appendix D- Stormwater Management Plan · MCU23/0078

                             Table 3: XP Storm Existing Peak Flow Results – Site B (South) (m3/sec)
                                                                     ARI & AEP
                 Storm Duration
                                    1 Years   2 Years    5 Years   10 Years     20 Years    50 Years       100 Years
                     (min)
                                      63%       39%       18%        10%           5%         2%               1%
                        20              0.000      0.001      0.011       0.023       0.034      0.043        0.058
                        25              0.000      0.003      0.017       0.027       0.039      0.055        0.069
                        30              0.002      0.005      0.022       0.033       0.045      0.061        0.073
                        45              0.007      0.012      0.030       0.043       0.055      0.071        0.085
                        60              0.010      0.015      0.036       0.049       0.064      0.083        0.098
                        90              0.013      0.018      0.039       0.053       0.070      0.083        0.098
                        120             0.013      0.018      0.037       0.053       0.069      0.081        0.096
                        180             0.013      0.018      0.038       0.054       0.070      0.079        0.093
                      Critical          0.013      0.018      0.039       0.054       0.070      0.083        0.098
                Critical Even (Min)      90         90         90          180             90     60           60


                             Table 4: XP Storm Existing Peak Flow Results – Site B (South) (m3/sec)
                                                                     ARI & AEP
                 Storm Duration
                                    1 Years   2 Years    5 Years   10 Years     20 Years    50 Years       100 Years
                     (min)
                                      63%       39%       18%        10%           5%         2%               1%
                        20              0.000      0.001      0.016       0.034       0.051      0.064        0.088
                        25              0.001      0.004      0.025       0.040       0.059      0.084        0.106
                        30              0.003      0.008      0.034       0.051       0.071      0.098        0.120
                        45              0.010      0.018      0.048       0.070       0.090      0.117        0.141
                        60              0.016      0.024      0.059       0.079       0.103      0.134        0.160
                        90              0.021      0.029      0.064       0.087       0.114      0.136        0.161
                        120             0.022      0.031      0.061       0.086       0.113      0.131        0.157
                        180             0.022      0.030      0.062       0.087       0.114      0.132        0.157
                      Critical          0.022      0.031      0.064       0.087       0.114      0.136        0.161
                Critical Even (Min)      120        120        90          90              90     90           90


        Discharge hydrographs for the existing model have been included in Appendix E.


4.1.3   XP Storm and Rational Method Comparison

        Before utilising data from XP storm, a comparison of results from XP Storm and the Rational Method was undertaken to
        ensure that the XP Storm model was functioning correctly. Peak discharge rates from the site in the existing case were
        compared (“site” catchments defined in Table 1). The comparison was undertaken for the Site A catchment only outlined
        in Table 4. Detailed Rational Method calculations can be reviewed in Appendix D.




                                                   www.bornhorstward.com.au                                            Page 7