RFI (rec. 5.06.26) 2567 - Appendix B - Site-Based Stormwater Management Plan (SBSMP) (Ver. 2)

3.3.2 MUSIC Meteorological Data

Meteorological data from Nambour Station (040282) was used for the MUSIC analysis. In
accordance with Section 3.2 of the MUSIC Modelling Guidelines, a 10-year climate period and
a 6-minute time step were selected. The model used rainfall and evapotranspiration data from
01/01/1989 to 31/12/1998, as specified in Table A1.1, Appendix A.1 of the guidelines.


Input parameters for the rainfall-runoff, source nodes and treatment devices were also
obtained from the guidelines. The following parameters were selected based on a
commercial/industrial development.

3.3.3 Rainfall-Runoff Parameters

The rainfall-runoff parameters listed in Table 3-3 below were used in the model. These
parameters are as recommended by the MUSIC Modelling Guidelines.


                       Parameter                             Commercial / Industrial
                       Rainfall Threshold (mm/day)                    1
                       Soil Storage Capacity (mm)                    18
                       Initial Storage (% of Capacity)               10
                       Field Capacity (mm)                           80
                       Infiltration Capacity Coefficient – a        243
                       Infiltration Capacity Exponent – b            0.6
                       Initial Depth (mm)                            50
                       Daily Recharge Rate (%)                        0
                       Daily Baseflow Rate (%)                       31
                       Daily Deep Seepage Rate (%)                    0
                                  Table 3-3 Recommended rainfall-runoff parameters




3.3.4 MUSIC Pollutant Export Parameters for Split Catchment Land Use

                                          TSS log10 (mg/L)           TP log10 (mg/L)      TN log10 (mg/L)
     Flow Type       Surface Type
                                          Mean      St. dev.         Mean      St. dev.   Mean     St. dev.
                    Roof                   N/A        N/A             N/A        N/A       N/A       N/A
   Base Flow        Road                   0.78      0.45            -1.11      0.48      0.14       0.20
                    Ground                 0.78      0.45            -1.11      0.48      0.14       0.20
                    Roof                   1.30      0.44            -0.89      0.36      0.25       0.32
   Storm Flow       Road                   2.43      0.44            -0.30      0.36      0.25       0.32
                    Ground                 1.92      0.44            -0.59      0.36      0.25       0.32
                                         Table 3-4 Pollutant export parameters




2576-SBSMP-01_Version 2.0 (April 2026)                                                             Page 9 of 23
SX/TB