Reference Documents - MCU24 0141 & OPW24 0184 [As Published]

              Table 4 - Bioretention Basin Characteristics

                Characteristic                                                              Bio Basin

                Extended Detention (m)                                                       0.300
                Filter Media Depth (m)                                                       0.700
                Transition Layer Depth (m)                                                   0.100
                Drainage Layer Depth (m)                                                     0.200
                Surface area (m2)                                                             48.0
                Filter Area (m2)                                                              28.0
              Table 5 - Swale Characteristics

                Characteristic                                                               Swale 2
                Length (m)                                                                      50
                Bed Slope                                                                     0.5%
                Base Width (m)                                                                  0
                Top Width (m)                                                                  0.6
                Depth (m)                                                                      0.15


                         4.2.4. MUSICX Model Results

              MUSIC modelling of the proposed catchments was performed to ensure the nominated treatment strategy
              achieves the required pollutant reduction objectives. The target reductions in stormwater pollutants are based
              on a comparison of an unmitigated scenario, having no treatment on site, and the mitigated scenario, which
              has stormwater treatment measures incorporated onto the site.
              Table 6 provides the modelling results for the development in its entirety. The MUSIC modelling demonstrates
              that compliance has been met or exceeded for the objectives required by NSC and the SPP (2017) for Total
              Suspended Solids (TSS), Total Phosphorus (TP), Total Nitrogen (TN) and Gross Pollutants (GP).
              Table 6 - MUSICX Model Results

                Pollutant        Unmitigated        Mitigated     Reduction Achieved      Target Reduction     Compliance
                                   (kg/yr)           (kg/yr)              (%)                    (%)
                   TSS                584.2               99.9            82.9                      80              Y
                    TP                1.26                0.370           70.64                     60              Y
                    TN                9.244               4.762           48.48                     45              Y
                    GP                88.72                0               100                      90              Y




240127 – Stormwater Management Plan             8 of 10