1909-13367 SRA referral response approved docs

The proposed site will have four major sub-catchments. The proposed treatment train will consist of
four bioretention basins, one for each sub-catchment.

Table 7 outlines the developed catchment details and the relevant treatment device.
The model layout is presented in Figure 3 below.

Table 8 – Catchment Summary / Treatment Details

                                                         Catchment
Sub-Catchment
                       BioBasin               BioBasin              BioBasin               BioBasin
                      Catchment 1            Catchment 4           Catchment 2            Catchment 3

      Area              56,980m2               2,750m2               18,140m2               29,450m2


 % impervious         87% approx.            100% approx.          87% approx.            87% approx.


                   Bioretention Basin 1                         Bioretention Basin 2   Bioretention Basin 3
                   Filter Area = 550m2    Bioretention Basin    Filter Area = 500m2    Filter Area = 500m2
                        minimum                   4                  minimum                 minimum
                   Extended Detention     Filter Area = 40m2    Extended Detention     Extended Detention
  Treatment                                    minimum
                      Depth = 0.3m                                 Depth = 0.3m           Depth = 0.3m
 device details
                    Area at the top of    Extended Detention     Area at the top of     Area at the top of
                   Extended Detention        Depth = 0.3m       Extended Detention     Extended Detention
                     Depth = 650m2        Filter Depth = 0.5m     Depth = 600m2          Depth = 600m2
                   Filter Depth = 0.5m                          Filter Depth = 0.5m    Filter Depth = 0.5m

  Flow Route                        LPOD 1                            LPOD 2                 LPOD 3



Figure 3 outlines the treatment train’s effectiveness and the pollutant load reductions achieved from
MUSIC stormwater modelling program. A larger image is provided in Appendix AB.




                         Figure 3 – MUSIC Model & Pollutant load reductions

Table 8 outlines the treatment trains effectiveness.



                                      Stormwater Management Report                                       14
S19-007                                 122 & 144 Myall St, Cooroy