Appendix D- SWMP

 29 September 2023



 Parameter                                                                                    Value


 Rainfall Threshold (mm)                                                                         1

 Soil Storage Capacity (mm)                                                                      18

 Initial Storage (% of capacity)                                                                 10

 Field Capacity (mm)                                                                             80

 Infiltration Capacity Co-efficient a                                                            243

 Infiltration Capacity Co-efficient b                                                            0.6

 Initial Depth (mm)                                                                              50

 Daily Recharge Rate (%)                                                                         0

 Daily Base Flow Rate (%)                                                                        31

 Deep Seepage (%)                                                                                0


                           Table 1 – MUSIC Rainfall Runoff Parameters (Commercial)

5.3.3.4 Pollutant Export Parameters
Specific Pollutant Export Parameters must be applied to each node type as cited in the Water By
Design MUSIC Modelling Guidelines. The values shown in Table 2 are for split catchment
commercial areas.

Runoff pollutant concentrations are generated stochastically from the defined mean and standard
deviation.
 Land Use – Commercial                   Log10 TSS (mg/L)               Log10 TP (mg/L)                Log10 TN (mg/L)


                                         Base            Storm         Base           Storm            Base      Storm
                                         Flow             Flow         Flow            Flow            Flow       Flow

 Roof                Mean                   0              1.30           0           -0.89             0        0.37

                     Std. Dev.              0              0.38           0            0.34             0        0.34

 Roads               Mean                0.78              2.43         -0.6          -0.30            0.32      0.37

                     Std. Dev.           0.39              0.38         0.5            0.34            0.30      0.34

 Ground              Mean                0.78              2.16         -0.6          -0.39            0.32      0.37
 Level/Open
 Space               Std. Dev.           0.39              0.38         0.5            0.34            0.30      0.34
                                Table 2 – Pollutant Export Parameters (Commercial)


 Excellence with Economy in Engineering                                                                                  11
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