Appendix F - SBSMP

6.2.1.6 Proposed Treatment Devices
Bio-Retention System
The following table summarises the individual parameters used in the MUSIC model for the proposed
conventional bio-retention system.
Table 9 - Bio-Retention Details

                              Properties                              Basin 1

                              Extended Detention Depth (m)              0.30

                              Minimum Surface Area (m²)                  35

                              Minimum Filter Area (m²)                   35

                              Saturated Hydraulic                       200
                              Conductivity (mm/hr)

                              Minimum Filter Depth (m)                   0.4

                              Maximum TN Content (mg/kg)                400

                              Maximum Orthophosphate                     30
                              Content (mg/kg)




6.2.1.7 Treatment Train Effectiveness
The table summarises the effectiveness of the proposed treatment trains modelled in MUSIC.
Table 10 - Treatment Train Effectiveness Result

                                                                          Achieved
                                              Inflows    Outflows                          Targeted
                Source Pollutants                                      Treatment Train
                                               (kg/yr)    (kg/yr)                          Reduction
                                                                          Reduction

         Total Suspended Solids (kg/yr)         1250        239                80.9%             80%

         Total Phosphorus (kg/yr)               2.34       0.619               73.6%             60%

         Total Nitrogen (kg/yr)                 13.1        6.53               50.1%             45%

         Gross Pollutants (kg/yr)               128           0                100%              90%



Results show that the proposed treatment train achieves the required water quality objectives.




 BR210522_SBSMP_Rev3.docx                                                                              Page 16 of 25