RFI - Appendix G SWMP by MPN Consulting

 16 December 2021



 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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