RFI - Attachment 3 - Stormwater Management Plan

                                            Figure 4.1 - 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 4.2 - Urban
Residential Split Node Pollutant Generation Parameters. The area and impervious fractions for each catchment are
actual values based on the design plans.


Table 4.2 - 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 4.2 - MUSIC Stormwater Treatment Train. The
details of the treatments are described in the following sections.




Project number 21020                                                                                            Page 18 of 36
File RECOR Concept Stormwater Management Report - 21020.docx, 2022-09-05
Revision 0


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