RFI - Attachment 7 - Updated SWMP

3.2.3.     Catchment Areas
The development has one developed catchment that will be routed to the basin. The layout has been split
into sources nodes with fraction impervious values applies as per MUSIC Modelling Guidelines (2018). See
Table 3-4 for catchment areas and fraction impervious values (FI).

Table 3-4: Catchment Areas and corresponding Impervious values

      Catchment                      Area (ha)       Roof (ha) – FI      Ground (ha) - FI   Road (ha) - FI

      Total                             0.706

      A                                 0.259           0.122 (1)           0.137 (0.80)

      B                                0.0945                -              0.095 (0.80)          -

      C (Carpark)                       0.353                -                   -            0.353 (1)


3.2.4.     MUSIC Model Layout
As the management of urban stormwater needs to take a holistic approach, specific management
measures need to be implemented in series to form a treatment train. The correct utilisation of various
devices within the treatment train is imperative to target the desired pollutants, from the gross solids to the
fine colloidal partials. Figure 3-2 shows the MUSIC model layout for the development.




                                                Figure 3-2: MUSIC Model Layout




21-0211SMP01V1 | Stormwater Management Plan | Good Shepherd Lutheran College Arts Centre                     Page 11