Attachment G - Stormwater Quality Management plan

                                                                                Callaghan & Toth

TABLE 4.1          MUSIC CATCHMENT AREAS (DEVELOPED)

                      Catchment                       Land Use            Music          Area (ha)
                                                                        Impervious

Catchment 1 – Event Precinct                       Urban Residential        10%               0.127

Catchment 2 – Water Play + area adjacent creek                              20%               0.110
(NOTE: water feature surface area is not part of   Urban Residential
stormwater catchment in MUSIC)

Catchment 3 – playground area                      Urban Residential        30%               0.156

Catchment 4 – Climbing precinct                    Urban residential        30%               0.180

Catchment 5 – northern picnic shelter area         Urban residential        30%               0.084

Catchment 6 – Frog Pond area                       Urban residential        30%               0.068

Catchment 7 – entry area                           Urban residential        10%               0.048



TOTAL                                                                                        0.773ha


4.2.2 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.

Tree Pits were placed in catchments 2, 3, 4 and 5 to treat runoff from the adjacent playground
areas and to connect into the subsurface drainage system. These tree pits have been designed
in accordance with IPWEAQ DS-077 and DS-078 (see Appendix C) and are generally 2.6m2
with 0.1m detention depth and 03m filter depth.

Biopods were placed in catchment 2, 3, 4, 5 and 7 to treat flows from the proposed pathways,
landscaped areas and softfall areas. These are all 5m2 in size, with a filter layer depth of 0.4m,
transition layer depth of 0.1m and drainage layer depth of 0.2m and an extended detention
depth of 0.2m. The size and depth of these systems has been designed in accordance with
Water by Design guidelines. A typical section of a bioretention system is shown in Appendix C
in IPWEAQ standard drawing WSUD-001and WSUD – 003.

BioSwale – this bioswale will treat flows from the event precinct open field – Catchment 1. It
has been modelled as being 60m long, with a bed slope of 1%, a top width of 2.0m.

Vegetated Swale – the existing swale will form part of the treatment train, with this existing
vegetated swale accepting flows from Catchment 4, 6 and 7. The swale has been modelled at


                                                                                                      11
2001 Hinterland Playground SWMP                                              February 2020