Stormwater Management Plan · MCU15/0122

                                                                                          15099 - SBSMP/2
                                                                                                     Page 19




Option 2
The proposed treatment train has been modelled using the following methodology:
    1. Roofwater runoff is captured and directed to the proposed underground on-site
       detention system. Outflow from the detention system is directed to a proposed Bio-
       retention Basin 1 to be located at the basement level within the south-western portion
       of the site.
    2. Surface runoff within the upper level car parking and access area will be captured by
       various pits containing litter baskets and then directed to an end-of-line proprietary
       stormwater quality treatment device to be located within the upper level landscaping
       area.
    3. Surface runoff from the exposed ramp and basement level areas along the western site
       boundary will be collected by various pits containing litter baskets. Additionally, a small
       swale along the southern site boundary is proposed to capture minor quantities of runoff
       from the southern portion of the site and convey the flows to Bio-retention Basin 1.

Refer to Table 6.5 for details of the treatment train assets.

                                      Table 6.5 - Proposed Treatment Assets

            Treatment         Treatment
                                                                    Description
              Level             Asset

             Primary/                               3m wide grassed swale along southern site
                            Grassed Swale
            Secondary                               boundary.
                                                    5 x Enviropod 200 Series Litter Baskets within
                                                    the gully pits on the basement level and 4 x
             Primary        Litter Baskets
                                                    Enviropod 200 Series Litter Baskets within the
                                                    upper level car park

           Secondary/                               Humes - Jellyfish JF-1200-2-1 underground
                           Humes - Jellyfish
            Tertiary                                stormwater quality treatment device


                                                -    70m2 Filter Media Area.
           Secondary/        Bioretention
                                                -    400mm depth of filter media;
            Tertiary            Basin 1
                                                -    200mm extended detention depth



6.2.3 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).




Site Based Stormwater Management Plan
Proposed Medical Development at Cnr Val Crescent & Goodchap Street, Noosaville