Callaghan and Toth IWMP Report revised

                                                                                       Callaghan & Toth


4.2.3 Rainfall Data

The meteorological data used for the MUSIC Model was the data for Cooroy from 01/01/73 –
31/12/82.

The mean Annual Rainfall for Cooroy                             1973 – 1982 = 1600mm


The MUSIC Modelling Guidelines for South East Queensland – Version 1 December 2010
details that Cooroy data for 1973 to 1983 should be used.

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 6.2.1 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 B.

                The treatment train effectiveness for the system.
                The MUSIC Version 6.2.1 Summary Report.

The information above indicates that the new Villas, entry building 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                                        28%
              Total Suspended Solids                      80%               80%
              Total Phosphorous                           61%               60%
              Total Nitrogen                              64%               45%
              Gross Pollutants >5mm                       99%               90%




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1714-Cartwrigth Village Extension_IWMP_Revision 3.doc                                  April 2019