MCU21.0117 OPW21.0199-Att 5 Stormwater · MCU21/0117

                    •   First-flush divertors will be installed for roof-water drainage to divert initial run-off
                        capture to irrigation of the vegetated areas on site.
                    •   4 x 5,000L Slimline Rainwater tanks will be used to capture roof run-off, with 75% of
                        the tank volume allocated to reuse, and 25% to detention storage.
                    •   2 x Bioretention areas will be used to treat and detain stormwater run-off from
                        driveway areas.
                    •   Ecosol Litter baskets (or similar) with 200µm mesh are to be provided within all
                        field inlet pits minimise sediment and gross pollutants from entering the drainage
                        line. Refer to Appendix D Ecosol Litter Basket Technical Specification for details.

                        4.2.1 MUSIC Modelling

            The proposed development and the above treatment train have been modelled in MUSIC
            (Model for Urban Stormwater Improvement Conceptualisation) software in accordance
            with the Water by Design MUSIC Guidelines 2018.

            The climatic data has been modelled using the rainfall and PET data at station 40059
            (Cooroy Composite) in 6-minute timesteps. The rainfall run-off parameters have been set
            as defined for the Southeast Queensland region, shown below in Figure 4.2 - Rainfall run-
            off parameters for SEQ.




                                           Figure 4.2 - Rainfall run-off parameters for SEQ

            The source nodes have been created using a split catchment approach, with the roof,
            driveway and other ground areas separated with stochastic pollutant generation for each
            of the surface types as per Table 4.1 - Urban Residential Split Node Pollutant Generation
            Parameters. The area and impervious fractions for each catchment are actual values based
            on the design plans.




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