1209 SWQMP Report_3 2013

                                                                           Callaghan & Toth

Sediment Basins wet coarse Sediment Basins will be required to pre-treat runoff from the
Bunded Poultry litter Composting areas:

    •    The sediment basin area required for the 70m long bunded composting area is 19m2
    •    The sediment basin area required for the 120m+87m long bunded composting area
         is 51.1m2

3.2.3 Rainfall Data

The meteorological data used for the MUSIC Model was the data for Cooroy from 01/01/92 –
31/12/01. The mean Annual Rainfall for Cooroy          92 – 02 = 1585mm

The MUSIC Modelling Guidelines for South East Queensland – Version 1 December 2010
details that Cooroy data for 1973 to 1983 should be used. This data has an annual average
Rainfall of 1600mm. It is considered that the 10 year period from 1992 – 2002 has a
relatively close mean annual Rainfall to the recommended 10 year period and as such is
acceptable to use in this case.

3.3      MUSIC Modelling Results

The MUSIC modelling program has been used to investigate the performance of various
treatment options in the treatment train. MUSIC version 5 is 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.


3.3.1 Water Quality Objectives

This model meets the pollution load reduction target as detailed in Water by Design Deemed
to Comply Solutions – Stormwater Quality Management (South East Queensland) version
1.0 – Table A-2. The following have been included in Appendix 3.
            • The treatment train effectiveness for the system.
            • The MUSIC Version 5 Summary Report.
The MUSIC modelling results indicate that the proposed additions to the farm can be treated
effectively by the proposed stormwater treatment train and this system will achieve
reductions in pollutant loads as detailed in Tables 3.2 and 3.3 below.

         TABLE 3.2:        COMPARISON OF LOAD REDUCTIONS FOR SHEDS & ROADS

             Parameter                             MUSIC       POLLUTANT
                                                 REDUCTION       LOAD
                                                  RESULT       REDUCTION
                                                                TARGETS
             Flow 34%
             Total Suspended Solids                  78% 80%
             Total Phosphorous                       59% 60%
             Total Nitrogen                          53%          45%
             Gross Pollutants                        54%




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1209 Animal Husbandry – Top Forestry Rd, Ridgewood                      SWQMP_REV_3
September 2013