06-09-22 Stormwater Management Plan_Issue F · MCU21/0175

 6 September 2022


These are listed in Table 1.

 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)

5.4.3.4 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                                                                                   10
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