Stormwater Management Plan -OPW (A) · OPW25/0042

Quality Modelling has been undertaken using the ‘split catchment’ method.
The Rainfall Runoff Parameters for the source catchments have been taken
from table 3.7 of Water By Design’s – MUSIC Modelling Guidelines, Version 1.0
2010 and are shown in Table 8.1 below.



          Pervious Area Properties

           Soil Storage Capacity (mm)                             18

           Initial Storage (% of Capacity)                        10

           Field Capacity (mm)                                    80

           Infiltration Capacity Coefficient ‘a’                  243

           Infiltration Capacity Exponent ‘b’                     0.6

          Groundwater Properties

           Initial Depth (mm)                                     50

           Daily Recharge Rate (%)                                0

           Daily Baseflow Rate (%)                                31

           Daily Deep Seepage Rate (%)                            0

           Rainfall Threshold (mm)                                1


Table 8.1: Rainfall Runoff Parameters & Pervious Area Properties

The pollutant load concentrations for each source catchment have been taken
from Table 3.8 of the Water by Design MUSIC Modelling Guidelines Version 1.0,
2010 using the concentrations recommended for Urban Residential areas.

The model was run for an average rainfall recorded at Cooroy Rainfall Station
using a 6 minute time step.

Please refer to the electronic MUSIC model attached at Appendix J.




__________________________________________________________________________

A6769/25/SWMP/Rev OpW(A) – Feb 2025
                                                                             Page 17 of 9
SH/PL
                         Brah101 Pty Ltd t/as ALTA PROJECTS