Attachment 7- Site Based Stormwater Management Plan

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.



4.3.3 Rainfall-Runoff Parameters

The rainfall-runoff parameters listed in Table 3.7 of MUSIC guidelines were used in the
model. The parameters recommended by the guideline are as shown in Table 4.4 below.


         PARAMETER                                                    Commercial/Industrial
         Rainfall threshold (mm)                                               1
         Soil storage capacity (mm)                                          18
         Initial storage (% capacity)                                         10
         Field capacity (mm)                                                 80
         Infiltration capacity                                               243
         Coefficient a
         Infiltration capacity                                                     0.6
         Exponent b
         Initial depth (mm)                                                        50
         Daily recharge rate (%)                                                    0
         Daily baseflow rate (%)                                                   31
         Daily deep seepage rate (%)                                                0
                               Table 4.4 Recommended rainfall-runoff parameters




4.3.4 MUSIC Pollutant Export Parameters Split Catchment Land Use (Industrial)

                                     TSS log10
                                                            TP log10 values         TN log10 values
                   Surface             values
 Flow Type
                    Type                      St.                          St.                    St.
                                   Mean                     Mean                      Mean
                                            dev.                          dev.                   dev.
 Baseflow             Roof          N/A      N/A             N/A          N/A            N/A     N/A
 parameters
                    Roads           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
                     Level
 Stormflow           Roof           1.30        0.44        -0.89         0.36           0.25    0.32
 Parameters
                    Roads           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
                     Level
                    Table 4.5 MUSIC Export Parameters Split Catchment Land Use (Industrial)




Site Based Stormwater Management Plan                                                           Page 11 of 20
1856-SBSMP-01_Version 2.0 (April 2019)