Att 1 - Engineering - RFI Reponse · MCU21/0117.01

                                                                                         23098 - SBSMP/4
                                                                                               Page 19




                                           Table 6-6 – MUSIC Parameters

                       Parameter                               Data Used

                      Rainfall Data             40059 Cooroy Composite 1973 to 1983

                   Modelling Timestep                          6 minutes

                         Routing                   No routing drain links were adopted


                              Table 6-7 – Catchment Runoff Generation Parameters

                                   Parameter                       Residential Catchment


                              Rainfall Threshold                              1

                         Soil Storage Capacity (mm)                          18

                     Initial Storage Capacity (% capacity)                   10

                             Field Capacity (mm)                             80

                      Infiltration Capacity Coefficient a                   243

                      Infiltration Capacity Coefficient b                    0.6

                              Initial Depth (mm)                             50

                           Daily Recharge Rate (%)                            0

                           Daily Baseflow Rate (%)                           31

                         Daily Deep Seepage Rate (%)                          0


6.3.5 MUSIC Modelling Results
Refer to Figure 6.1 for a print screen schematic of the MUSIC model for the proposed development
and Figure 6.2 for the annual pollutant loads that will be discharged from the site for the proposed
development.




Site Based Stormwater Management Plan
Proposed Townhouse Development at 5 Pearl Street, Cooroy