A6880 - Eng - June 2024

         Queensland Water Quality Objectives (2009) have been adopted which
         recommend the following minimum reductions in mean annual pollutant loads
         leaving a development site compared to the developed unmitigated case:

           •       80% reduction in Total Suspended Solid Load;
           •       65% reduction in Total Phosphorous Load;
           •       45% reduction in Total Nitrogen Load;
           •       90% reduction in Gross Pollutant Load.


       MUSIC modelling of the proposed treatment train has been undertaken generally in
       accordance with Water by Design’s - MUSIC Modelling Guidelines, Version 1.0-2010.
       Modelling has been undertaken using the ‘split catchment’ method.

       The Rainfall Runoff Parameters for the source catchments have been taken from
       table 3.7 of Water By Design’s – MUSIC Modelling Guidelines, Version 1.0 2010 and are
       shown in Table 5.4.1.c below.


                               Table 2.1: Rainfall Runoff Parameters

               Pervious Area Properties

                 Soil Storage Capacity (mm)                              18

                 Initial Storage (% of Capacity)                         10

                 Field Capacity (mm)                                     80

                 Infiltration Capacity Coefficient ‘a’                   243

                 Infiltration Capacity Exponent ‘b’                      0.6

               Groundwater Properties

                 Initial Depth (mm)                                      50

                 Daily Recharge Rate (%)                                 0

                 Daily Baseflow Rate (%)                                 31

                 Daily Deep Seepage Rate (%)                             0

                 Rainfall Threshold (mm)                                 1



         The pollutant load concentrations for each source catchment have been taken
         from Table 3.8 of the Water by Design MUSIC Modelling Guidelines Version 1.0, 2010
         using the concentrations recommended for Industrial areas.

         The model was run for an average rainfall recorded at Cooroy rainfall station
         using a 6 minute time step.
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A6880/24/ENG/Noosaville                                                6
June     SH/pl
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