Stormwater Management Plan · MCU22/0058

                                            Figure 3.2 – DRAINS Pre-development catchment




                                           Figure 3.3 – DRAINS Post-development catchments




                                       Figure 3.4 – DRAINS Split Post-development catchments


The results of the modelling against the range of design storms for the development under the existing and
proposed development conditions are shown in Table 3.1 Existing and proposed unmitigated site peak discharge
rates.
                              Table 3.1 Existing and proposed unmitigated site peak discharge rates

                                                                        Wyandra Street
                                                                                                         Qchange
                                           A.E.P                Qexisting      Qproposed    Qchange       (%)
                                                                (m³/s)         (m³/s)       (m³/s)
                                             1EY                 0.016          0.018        0.002        13%
                                            50%                  0.019          0.021       0.002         11%
                                           0.2 EY                0.028          0.031       0.003         11%
                                            10%                  0.036          0.036          0           0%
                                             5%                  0.041          0.041          0           0%
                                             2%                  0.047          0.047          0           0%
                                             1%                  0.051          0.052       0.001          2%



As expected, the site has increased the total peak flows from the site for a number of storm events. Attenuation will
be required to mitigate the outflows to ensure that the development does not exceed the predevelopment levels to
Project number 20220078
File RECOR Preliminary Stormwater Management Report - 20220078.docx, 2022-03-29                                      Page 8 of 15
Revision 0


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