Amended Site-Based Stormwate Management Plan · RAL18/0023

4.3.6 MUSIC Model Results

Figure 4.10 shows the MUSIC model treatment train layout and results from the proposed
stormwater quality improvement devices (SQIDs), which is also shown on drawings
1856/SW01-SW05 in Appendix A. The results as shown below were generated using the
stochastic option as per the guidelines.




                                        Figure 4.10 MUSIC Model Results


All load-based pollutant reduction efficiencies are met in accordance with the Table A in
Appendix 2: Stormwater Management Design Objectives, Part G, SPP (2017) included in
Appendix B.


The treatment nodes for West Hofmann Drive Catchments C2 and C3 were updated to
reflect the increased surface area due to the use of batters around the filter media surface
that weren’t previously modelled. The bases will likely have some exfiltration although this
is restricted to the exfiltration rate for heavy clays as opposed to the sand soils encountered
on site.




Site Based Stormwater Management Plan                                              Page 16 of 20
1856-SBSMP-01_Version 3.0 (May 2019)