Appendix B - SWMP, Flood Cert & Form 15

                         Table 3.2 Existing and proposed mitigated site peak discharge rates

                                        53 Doonella Street                    55 Doonella Street               Total
                      A.E.P      Qexisting     Qproposed        Qchange   Qexisting   Qproposed     Qchange   Qchange
                                 (m³/s)        (m³/s)           (m³/s)    (m³/s)      (m³/s)        (m³/s)    (m³/s)

                    63.20% 0.009               0.010           0.001      0.012       0.011        -0.001     0.000
                    50%         0.010          0.011           0.001      0.013       0.012        -0.001     0.000
                    20%         0.014          0.013           -0.001     0.019       0.015        -0.004     -0.005
                    10%         0.017          0.015           -0.002     0.022       0.017        -0.005     -0.007
                    5%          0.020          0.016           -0.004     0.026       0.018        -0.008     -0.012
                    2%          0.024          0.018           -0.006     0.030       0.020        -0.010     -0.016
                    1%          0.026          0.023           -0.003     0.034       0.027        -0.007     -0.010


            As the total peak flows are equal to or below the existing site conditions, the development
            suitably controls the peak flow storm events from the development.

            4. STORMWATER QUALITY
            The following sections discuss the stormwater quality considerations for the construction
            and operational phase of the development. Refer to Appendix A Proposed Development
            Plans for the proposed stormwater drainage layout plan.


            4. 1. C O N S T R U C T I O N P H A S E

            4.1.1 Erosion and Sediment Control Measures

            During construction, it will be necessary to manage stormwater run-off to avoid potential
            contamination of downstream waterways from sediments and other pollutants from the site.
            Best practice erosion and sediment controls shall be installed to minimise the discharge of
            potential contaminants from the site, in accordance with the objectives of Appendix 2 of the
            SPP (DERM, July 2017) shown below in Figure 4.1.




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