Attachment G - Stormwater Quality Management plan

                                                                                 Callaghan & Toth


1.0 SUMMARY
The key points of this investigation are as follows:

    1. Runoff from new playground including hardstand areas of pathways, roofs, and
       landscaped areas is to be cleaned of nutrients and gross pollutants via biopods, tree
       pits, swales and rainwater tanks. Treated runoff is then released to existing outlets into
       the adjacent Cooroy Creek.
    2. Pollutant loads from development are to be attenuated.
    3. Recent contaminated land investigations show that the site is suitable for the proposed
       use.
    4. The flood study detailed that earthworks, when adjusted as listed in report, associated
       with the new playground will not affect flood levels in the Cooroy Flood Study.
    5. The upstream catchment stormwater flows which will flow through the site, should be
       treated or bypassed due to stormwater quality and litter conveyance into the proposed
       playground.


2.0 INTRODUCTION
This Stormwater Quality Management Plan (SWQMP) has been prepared as part of a Material
Change of Use application to Noosa Council. This SWQMP is in accordance with:
   1. Water Sensitive Design Code in the Noosa Plan, and
   2. The latest Water Sensitive Urban Design Technical Design Guidelines for South East
       Queensland, published by Health Waterways.

The proposed hinterland playground will be located on part of Lot 3 SP230055 and Lot 1 and 2
RP153299 and as shown in Site Location Plan, Fig 1.1 and is located at 1, 3 and 9 Maple
Street, Cooroy. Lot 3 SP230055 is divided by the Marara Street road reserve which contains
the existing carpark to the east of the proposed hinterland playground site and the portion to the
east of the carpark contains the existing library building. The playground site is bounded by
Cooroy Creek to the north and Maple Street to the south.

This SWQMP considers the new hardstand areas, including new concrete pathways, shelter
roof areas, gravel areas, rock areas and softfall areas, for the hinterland playground site.

In order to receive planning approval from Noosa Council, this site must demonstrate that it
complies with Council’s Water Sensitive Design Code and that the storm water runoff will not
change the surrounding hydrology. Proposed treatment systems include tree pits, biopods, a
swale, a bioswale and rainwater tanks which can accept the flows from the new hardstand
areas for treatment. These devices will enable the water quality objectives to be achieved.

The Model for Urban Stormwater Improvement Conceptualization (MUSIC) has been used to
assess the suitability of various treatment devices and to model existing and predicted pollution
export loads and concentrations.




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2001 Hinterland Playground SWMP                                               February 2020