Att 4 - SWMP · MCU21/0117

                                    C4                      0.017   100

                                    C5                      0.017   100

                                    C6                      0.035   37.5

                                    C7                      0.003   0

                                    C8                      0.010   0

                                    C9                      0.019   0

                                    C10                     0.017   90.4

                                    C11                     0.037   54.7

                                    C12                     0.008   0

                                    E1                      0.044   20.4

                                    E2                      0.067   29.3

                                    E3                      0.037   76.9

                                    E4                      0.020   100

                                    E5                      0.033   23.1

                                    E6                      0.018   33.2

                                    E7                      0.082   51.5

                                    E8                      0.001   100



            The modelling demonstrates that there is sufficient capacity in the proposed stormwater
            network and the existing downstream network to accommodate the 1% AEP storm event
            without relying on overland flows. The modelling also demonstrates that the storage areas,
            comprised of the 4 5,000L rainwater tanks (2.5KL/tank attenuation portion only – reuse
            portion considered full at time of storms) and the bioretention areas provide sufficient
            capacity so that the internal drainage network is not exceeded for the 1% AEP storm event.
            The output of the hydraulic modelling showing the maximum Hydraulic Grade Lines (HGL)
            for the development is provided in the Drainage Longsections within Appendix A Proposed
            Development Plans.


            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.


                                                                                                           Page 9 of 26
P +61 7 5211 1003       A 37 Mary St, Noosaville Qld 4566           E [email protected]   recorconsulting.com