080624 2383-01 FINAL Engineering Report for DA.pdf [As Published] · 132008.1128

BLUE CARE SUNRISE BEACH
ENGINEERING REPORT FOR DEVELOPMENT APPLICATION


    Table 2.5, Pollutant Removal Rates for GPT

             Pollutant                 Removal Efficiency      Pollutant Removal Ordinates
                                             (%)
                                                                Input                 Output

                 TSS                            0                 75                      75
                                               40.0              175                     105
                  TN                           10                 10                      9
                  TP                           10                 10                      9
       Gross pollutants                        100               100                      0


    Rainwater Tank

    The total volume of the rainwater tanks was based on the 129 dwelling units
    (Independent Living Units, Apartments, Serviced Apartments), plus a factor for external
    use. The total storage volume has been determined to be 442m3.

    Bioretention / Detention Basin

    The filter medium was modelled as 0.4m thick, with 0.4m extended detention depth.
    The basin bottom surface area was input as 700m2 which produced a high-flow bypass
    rate of 0.078m3/s.


    2.5.4          MUSIC Model Results – Predicted Water Quality

    The MUSIC model was run for various combinations of treatment options to achieve the
    required stormwater quality objectives. The results presented in Table 2.6 are for the
    adopted pollutant removal devices, outlined in Section 2.5.3.          These results
    demonstrate that the required pollutant load reduction targets will be met by the
    proposed stormwater treatment infrastructure.

    Table 2.6, Developed Pollutant Load Reductions

                                                                                 Pollutants
                                                              Total             Total            Total
                                                            Suspended        Phosphorous       Nitrogen
                                                              Solids
      Load Based Reduction, post-                             80.1                 64.7          58.0
      developed case

      Pollutant Removal Objective (%)                          80                   60           45




Blue Care Property Development Unit                        Version 1.1                                    24 June 2008
2008 06 24 2383-01 Engineering Report for DA          Commercial in Confidence                                  Page 9