Stormwater Management Plan · MCU15/0122

                                                                                          15099 - SBSMP/3
                                                                                                     Page 18




6.2.2 Proposed Treatment Train
Given the current review being undertaken within Noosa Council regarding the acceptance of
various stormwater quality treatment technologies, two separate options have been provided
for stormwater quality treatment for the proposed development. The provision of two separate
options at this conceptual stage ensures that the development can be provided with a
stormwater quality treatment system that meets Council’s future requirements whilst
optimising broader development outcomes.
Option 1
The proposed treatment train has been modelled using the following methodology:
    1. Roofwater runoff is captured and directed to a combined rainwater re-use and on-site
       detention system which will incorporate 10kL of storage dedicated to external rainwater
       re-use. Overflow from the tank will be directed to a proposed bio-retention basin (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 sheet flow into
       two proposed bio-retention basins to be located along the eastern boundary of the site.
    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 into Bio-retention Basin 1


Refer to Table 6.4 for details of the treatment train assets.
                                      Table 6.4 - Proposed Treatment Assets

            Treatment         Treatment
                                                                    Description
              Level             Asset

                                                    5 x Enviropod 200 Series Litter Baskets within
             Primary        Litter Baskets
                                                       the gully pits on the basement level.

             Primary/                               3m wide grassed swale along southern site
                            Grassed Swale
            Secondary                               boundary.
                                                    10kL of dedicated rainwater storage will be
             Primary/                               provided as part of the detention system.
                          Rainwater Re-use
            Secondary                               The stored water will be used for external
                                                    irrigation.
                                                Bio-retention Basin 1
                                                    - 70m2 Filter Media Area.
                                                    - 400mm depth of filter media;
                                                    - 200mm extended detention depth
           Secondary/       Bio-Retention
            Tertiary            Basins          Bio-retention Basin 2
                                                    - 20m2 Filter Media Area
                                                    - 400mm depth of filter media;
                                                    - 200mm extended detention depth




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