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Appendix D- Stormwater Management Plan · MCU23/0078
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5.2.4 Source Nodes
The second step taken in creating the MUSIC models was to define ‘Source Nodes’ or Sub-Catchments. Source nodes for
modelling these catchments were based on the Water by Design reference material: Music Modelling Guidelines. The
MUSIC model uses the split catchment approach and consists of commercial source nodes. Catchment areas are outlined
in Table 17, 18 and 19 below with catchment extents illustrated in Appendix F for both proposed sites.
Table 17: Source Node Information – Site A Catchment
Node type Area (ha) Fraction Impervious
Commercial Road 1.59 100%
(Car Park & Un-Treated Private Access
Roadway)
Commercial Roof 2.13 100%
Table 18: Source Node Information – Site B Northern Catchment
Node type Area (ha) Fraction Impervious
Commercial Road (Car Park) 0.191 100%
Commercial Roof 0.057 100%
Table 19: Source Node Information – Site B Southern Catchment
Node type Area (ha) Fraction Impervious
Commercial Road (Car Park) 0.259 100%
Commercial Roof 0.130 100%
The input parameters used are listed in Appendix F.
5.2.5 Treatment Methodology
Runoff from the development site will be conveyed through litter baskets and treated via a proprietary treatment device
owned by the development owners. SPEL Stormwater and Ocean Protect provide proprietary treatment devices and litter
baskets for stormwater treatment purposes and the MUSIC modelling has been performed on both suppliers to enable a
comparison of products and to allow for supply and installation of either product.
5.2.6 Treatment Nodes
The MUSIC model consisted of 2 treatment nodes as detailed in Table 20. Treatment node input parameters were based
on the MUSIC Modelling Guidelines and sourced from the two product suppliers. Refer to Appendix B for indicative
locations of these treatment devices.
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