Attachment C - Stormwater report

4.3.3.          Rainfall Runoff Parameters
The rainfall runoff export parameters have been adopted from Table 3.7 of the MUSIC Modelling Guidelines
Version 1.0, as summarised in Table 5.
Table 4 - Rainfall-runoff Parameters for MUSIC Source Nodes.

Parameter                              Forest            Urban             Transportation        Industrial         Agriculture

Rainfall threshold (mm)                   1                   1                  1                   1                  1

Soil storage capacity (mm)              120               500                   500                 18                  98

Initial storage (% capacity              10                10                   10                  10                  10

Field capacity (mm)                      80               200                   200                 80                  80

Infiltration          capacity          200               211                   211                 243                 84
coefficient a

Infiltration          capacity           1.0               5.0                  5.0                 0.6                3.3
exponent b

Initial depth (mm)                       50                50                   50                  50                  50

Daily recharge rate (%)                  25                28                   28                  0.0                100

Daily baseflow rate (%)                   3                27                   27                  31                  22

Daily deep seepage rate (%)              0.0               0.0                  0.0                 0.0                 0


4.3.4.          Pollutant Export Parameters
The pollutant export parameters have been adopted from Table 3.9 of the MUSIC Modelling Guidelines
Version 1.0, as summarised in Table 5.

Table 5 - Pollutant Export Parameters for Urban, Industrial, Mining and Waste, Forest and Agriculture Source Nodes (extracted
from Table 3.9, Water by Design, 2010).

                                                10                              10                             10
                                        TSS log values                     TP log values                  TN log values
 Land Use         Flow Type
                                     Mean            St. dev.          Mean           St. dev.       Mean             St. dev.
                   Baseflow           1.00             0.34            -0.97           0.31           0.20              0.20
   Urban
 residential
                  Stormflow           2.18             0.39            -0.47           0.32           0.26              0.23

                   Baseflow           0.78             0.45            -1.11           0.48           0.14              0.20
 Industrial
                  Stormflow           1.92             0.44            -0.59           0.36           0.25              0.32

                   Baseflow           1.03             0.55            -1.07           0.46           0.38              0.27
Mining and
  Waste
                  Stormflow           3.72             0.34            -0.03           0.27           0.73              0.22


Stormwater Management Plan – Lot 1 on SP108094, 305 Lake Macdonald Drive                                                    Page 14

D’VINERIPE
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