H Swqmp · 132007.2398

                                                                                                CALIBRE CONSULTING




4.4.3 DRAINAGE LINKS

No routing was adopted for drainage links within MUSIC model in accordance with Section 4.17 of the MUSIC Modelling
Guidelines (2010). This assumes flows and associated pollutants from all parts of the catchment arrive at the treatment
nodes at the same time. This is conservative as it means that MUSIC may overestimate the overflow volumes.

4.4.4 TREATMENT NODES

4.4.4.1 BIORETENTION TREATMENT NODE

Bioretention treatment nodes were used to model the proposed bioretention filter in the northern and southern basin and
bio-pod. Default K and C* values were adopted for these treatment nodes. These treatment nodes were set up generally
in accordance with the MUSIC Modelling Guidelines (2010) and Interim MUSIC Bioretention Treatment Node (2013).
Refer to Table 4-2 below, Bioretention Treatment Node Configuration. All other parameters have been adopted from
MUSIC Modelling Guidelines (2010).
                                  Table 4-2: Bioretention Basin Modelled Parameters


                     Parameter                                   Northern Basin     Southern Basin
                     Surface Area (m2)                                450                350
                     Filter Area (m2)                                 450                350
                     Extended Detention Depth (m)                      0.3                0.3
                     Filter Depth (m)                                  0.6                0.4
                     Filter Media Type                            Sandy Loam         Sandy Loam
                     Saturated Hydraulic Conductivity of              200                200
                     Filter Media (mm/hr)
                     TN Content of Filter Media (mg/kg)               400                400
                     Orthophosphate Content of Filter Media            50                 50
                     (mg/kg)
                     Overflow Weir (m)*                                45                 35
                       * Overflow weir has been conservatively modelled as 10% of the filter area.

4.4.4.2 POND NODE

A pond node was used to model the WQCP for southern basin. The MUSIC configuration are provided in Table 4-3
below. Details are shown on the Drawing No. B14158.W-SK08 in Appendix C.

                                           Table 4-3: Pond Node Configuration


                                         Pond Parameter             Southern Basin
                                 Surface Area (m²)                           759
                                 Extended Detention Depth (m)                0.50
                                 Permanent Pool Volume (m³)                  800
                                 Notional Detention Time (hrs)               23.7
                                 Equivalent Pipe Diameter (mm)               52




B14158.W-01A | COOROY RETIREMENT COMMUNITY| PALM LAKE RESORTS                                                        |8