Appendix B - SWMP, Flood Cert & Form 15

                                        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.


                    Table 4.1 - Urban Residential Split Node Pollutant Generation Parameters

             Flow Type      Surface          TSS LOG¹º                TP LOG¹º VALUES               TN LOG¹º VALUES
                            Type             Mean      St. Dev        Mean       St. Dev            Mean      St. Dev
             Baseflow  Roof                     N/A            N/A      N/A            N/A            N/A        N/A
                       Driveway                 1.00           0.34    -0.97           0.31           0.20       0.20
                       Ground                   1.00           0.34    -0.97           0.31           0.20       0.20
             Stormflow Roof                     1.30           0.39    -0.89           0.31           0.26       0.23
                       Driveway                 2.43           0.39    -0.30           0.31           0.26       0.23
                       Ground                   2.18           0.39    -0.47           0.31           0.26       0.23

            The proposed treatment train has been modelled as shown in Figure 4.3 - MUSIC
            Stormwater Treatment Train. The details of the treatments are described in the following
            sections




                                        Figure 4.3 - MUSIC Stormwater Treatment Train



                         4.2.1.1.       Rainwater Tanks

            The rainwater tanks connected to the source nodes representing their drained catchments.
            Each of the tanks to be provided is modelled as a 3kL storage volume, with 1.5kL allocated
            for re-use (assumed to be full at beginning of the modelling) and the remaining portion
            being for attenuation capacity.



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