RFI - Attachment E - SWMP Callaghan and Toth

                                                                                 Callaghan & Toth

TABLE 4.1          MUSIC CATCHMENT AREAS (DEVELOPED)

                      Catchment                         Land Use           Music            Area (ha)
                                                                         Impervious

                    Adjacent Industrial Catchment – former Lot Reconfiguration Model
Catchment 1a – Lots Future, 1, 2, 3 East & 4             Industrial           65%                0.68
Catchment 1b – Lots Future, 1, 2, 3 East & 4 Roof          Roof              100%                0.25
Areas
Catchment 1c – Road Reserve North                       Commercial            35%                0.28
Catchment 2a – Road Reserve South West                  Commercial            35%                0.08
Catchment 2b – Road Reserve South East                  Commercial            35%                0.10
Catchment 5a – Lot 3 West                                Industrial           65%                0.44
Catchment 5b – Lot 3 West Roof Area                        Roof              100%                0.05
TOTAL                                                                                            1.88
                           EXISTING & PROPOSED AREAS ON LOT 5 AND LOT 7

Catchment 6 – Camphor Shed and carpark                   Industrial          90%                 0.06

Catchment 7 - Existing carpark + driveways –                                 100%                0.21
                                                         Industrial
formalising area

Catchment 8 – new pathway                                Industrial          90%                 0.014

Catchment 9 – existing grass/gravel area                 Industrial          20%                 0.08

Catchment 10 – new carpark area – part of grass                              25%                 0.05
area
                                                          Industrial

Ctachment 11 - new carpark area – existing grass                             25%                 0.25
                                                         Industrial
area

TOTAL                                                                                           0.664ha


4.3.2 Treatment Nodes

The “MUSIC Modelling Guidelines for South East Queensland” Version 1.0 prepared by Water
by Design and dated December 2010 has been used to set the rainfall runoff parameters and
pollutant export parameters for the site.

The land use type used for this model was “Industrial” and the values in the guideline shown in
Table 3.7 and Table 3.8 of the guidelines have been used in this model. Figure 4.1 shows the
MUSIC Model layout for the site. Refer to IPWEAQ standard drawings WSUD 001 & WSUD
003 ( See Appendix C)

Bioretention Basins the existing biobasin in Lot 7 constructed in 2005 will continue to treat flows
from the existing carpark and hardstand areas and from the new proposed carpark, landscaped
areas, and pathways. The existing biobasin (BB1) in Lot 7 is 12m x 12m with a total filter area
of 144m2. The existing biobasin (BB2) adjacent Mary River Road is 3m x 8.65m with a total
filter area of 26m2. This treatment node has been updated to Version 6.2.1 MUSIC model node
and has been amended to reflect the proposed design changes to the biobasin detailed in
Section 6.0.


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2001 Lower Mill Carpark Extension SWMP                                              July 2020