RFI - ATTACHMENT A - SBSMP - Rev 2

                                                                                    20169 - SBSMP/2
                                                                                              Page 15




6.3.2 Proposed Treatment Train
The proposed treatment train has been modelled using the following methodology:

    1. Roofwater from Building 1 will be collected by a 15kL rainwater reuse tank with overflow to
       the Eumundi Noosa Road kerb and channel.

    2. Roofwater from the rest of the proposed development will be collected by the internal
       drainage network which will subsequently direct flow to the end-of-line bio-retention basin
       for treatment.

    3. Surface runoff from the hardstand areas and landscaping areas will be collected by various
       pits. The internal drainage networks will subsequently direct flow to the end-of-line bio-
       retention basin for treatment.

All runoff described above will then discharge to the lawful point of discharge. A Concept Site
Levels and Drainage Plan of the proposed internal drainage network detailing the treatment train
assets is included in Appendix F. Refer to Table 6.5 for details of the proposed treatment train
assets.

                                Table 6.5- Proposed Treatment Assets

          Treatment          Treatment
                                                                    Description
            Level              Asset

                          Rainwater Reuse
           Primary/                                15kL tank installed at the north western
                          Tank (Landscape
          Secondary                                corner of the site.
                           Irrigation Only)


          Primary/                               1. 70m2 Total Filter Area
                            Bio-retention
         Secondary/                              2. 0.4m Filter Media Depth
                                Basin
          Tertiary                               3. 0.2m Extended Detention Depth


Refer to Appendix K for the Stormwater Quality Operation Management and Maintenance
Guidelines.

6.3.3 Pollutant Export Modelling
Following the definition of water quality objectives for the site and an assessment of the treatment
options suitable for the development, the most appropriate treatment scheme for the site was
identified. The impact of the stormwater management strategy on the quality of stormwater runoff
discharged from the site has been assessed using the pollutant export model, Model for Urban
Stormwater Improvement Conceptualisation (MUSIC).

6.3.4 MUSIC Modelling Parameters
The MUSIC model was set up in accordance with the Water-By-Design MUSIC Modelling Guidelines
for South East Queensland to the parameters listed in Table 6.5 and Table 6.6. Refer to Figure 6.1
for source node areas.




Site Based Stormwater Management Plan
Proposed Townhouse Development at 101-105 Eumundi Noosa Road, Noosaville