Amended Site-Based Stormwate Management Plan · RAL18/0023

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 (Commercial)

                                    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        0.39         -0.6         0.50           0.32    0.30
                   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        0.38        -0.30         0.34           0.37    0.34
                   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 3.0 (May 2019)