Appendix C - Stormwater Management Plan

                                Table 3.2 Existing and proposed mitigated site peak discharge rates

                                                                   Wyandra Street
                                                                                                    Qchange
                                            A.E.P           Qexisting   Qproposed      Qchange       (%)
                                                            (m³/s)      (m³/s)         (m³/s)
                                             1EY             0.044       0.044          0.000         0%
                                             50%            0.051          0.050       -0.001         -2%
                                           0.2 EY           0.080          0.076       -0.004         -5%
                                             10%            0.095          0.091       -0.004         -4%
                                              5%            0.112          0.104       -0.008         -7%
                                              2%            0.129          0.123       -0.006         -5%
                                              1%            0.150          0.140       -0.010         -7%



Under the proposed conditions, the existing 250mm stormwater pipe was found to be capable of
conveying the peak flows generated from the existing and proposed development without exceeding the
required freeboard of the existing pit as shown below in Figure 3.6 – Peak 1% Developed Flow in Existing
250mm PVC pipe. The existing point of discharge therefore has adequate capacity to carry the peak
attenuated flows resulting from the development.




                                 Figure 3.6 – Peak 1% Developed Flow in Existing 250mm PVC pipe




Project number 20220213
File 20220213 Reserve St SWMP.docx, 2022-09-19 Revision 1                                                       Page 10 of 16

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