PART Response to Information Request · OPW11/0335

           1.    As per stage 1, without the swale for the capture of sheet-flow from the northern
                 catchment areas

6.3         Modelling of the Stormwater Treatment Train

           Version 4 of the Model for Urban Stormwater Improvement Conceptualisation (MUSIC
           v4) has been utilised to predict the performance of the proposed stormwater treatment
           train. The use of Version 4 of the MUSIC model has been maintained due to the timing
           of the submission of the original application (prior to the release of Music V5). Modelling
           for both Stage 1 only and the complete development has been conducted to ensure that
           the proposed treatment system will be effective at all stages.

           Music model parameters have been developed and agreed to by the stormwater experts
           (David Bristow and Neil Collins) as part of the Planning and Environment court appeal
           (Appeal No: 2587 of 2008) concerning the development.

           In addition to load reduction predictions a 'no worsening' case has been applied,
           comparing the predicted discharge from the undeveloped site with the development
           stages.

            6.3.1      Existing Development

           The site is presently developed as a caravan park (the Peregian Beach Caravan Park),
           with approximately two thirds of the existing site being cleared for caravans and
           camping, consisting of mown grass under a light canopy of Broad-leaved Paperbark
           (Melaletica quinquenerva).

           Land uses in the Peregian Beach Village area surrounding the proposed development
           site includes retail and businesses, sporting facilities, a kindergarten, and the Noosa
           National Park.

           There is currently no stormwater quality improvement or treatment devices installed at
           the existing caravan park. Modelling has been conducted to provide a baseline to allow
           the comparison of the performance of the developed stormwater system to the existing
           case. The stormwater system must achieve both the quality objectives in Table 3-1 and
           a no worsening' of pollutant loads on the national park.

           Table 6-2: MUSIC Model Results - Undeveloped Site
                            Water Quality Indicator                                                     Result
            Estimated long-term load (kg/year)                                        % reduction               Load (kg/year)
            Suspended Solids                                                                 0                        2170
            Total Phosphorus                                                                 0                          5.1
            Total Nitrogen                                                                   0                          30

           6.3.2      Stage I Modelling

          Results of MUSIC modelling showed that there will be no net increase in stormwater
          runoff from the site. Loads of sediment, total nitrogen and total phosphorus will be
          substantially removed from stormwater before entering the Noosa National Park
          (Appendix B).

          Modelling for the Stage 1 development predicted a 15% reduction in stormwater entering
          Noosa National Park, from 13.1 ML/year to 11.1 ML/year. The annual load of total
          suspended solids from the existing site (the caravan park) was predicted to be

©2012 Simmonds & Bristow Pty Ltd                         Contrast Constructions                           J-1005-310 - 13 January 2012
I \CLIENTFILES\Contrast Cons1rudions11 108-155c - Essence of Peregian SCEP Stage 1 Update109_Output Documents\1 108.155C_SWMP
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