Appendix B - IWMP_2PearsonsRd_REV0

                                                                                   Callaghan & Toth



4.3      MUSIC Modelling Results

The MUSIC modelling program has been used to investigate the performance of various
treatment options in the treatment train. MUSIC version 6.3 is the current version and capable
of incorporating rainwater re-use in the model. These features have been used in making
comparisons between different stormwater management systems for this report.


4.3.1 Water Quality Objectives

This model meets the pollution load reduction target as detailed in the State Planning Policy
2017 (Appendix 2: Table B). The following have been included in Appendix A.

               The treatment train effectiveness for the system.
               The MUSIC Version 6.3 Summary Report.

The information above indicates that the new carpark, sealing, footpaths, and associated
landscaping with the proposed stormwater treatment train will achieve reductions in pollutant
loads as detailed in Table 4.2 below.

         TABLE 4.2:         COMPARISON OF LOAD REDUCTIONS

             Parameter                      MUSIC            POLLUTANT LOAD
                                          REDUCTION             REDUCTION
                                           RESULT                TARGETS
                                                             (Source: SPP 2017)
             Flow                             2.1%
             Total Suspended Solids           85%                     80%
             Total Phosphorous                59%                     60%
             Total Nitrogen                   56%                     45%
             Gross Pollutants >5mm            100%                    90%



4.3.2 Assessment of Results

The developed site has been modelled as a series of Urban Residential sub-catchments, which
incorporate Water Sensitive Urban Design (WSUD) treatment trains. Plan No 2035-01 shows
the proposed location of the treatment system - Biobasin 1.

The reductions listed in Table 4.2 above comply with Council’s requirements, Water by Design
Deemed to Comply Solutions and the State Planning Policy December 2013 – Appendix 2,
Table B. Therefore, it is considered that the proposed stormwater treatment system is currently
sufficient to reduce the pollutants prior to exiting the site and entering the tributaries of the Six
Mile Creek.




                                                                                                   15
2035 2 Pearsons Road IWMP                                                      September 2020