Attachment 1 - Stormwater Management Plan

            A site-specific erosion and sediment control plan shall be prepared as part of a future
            submission for Operational Works approval. Suitable erosion and sediment controls for the
            site may include:

                    1. Sediment fencing along all downstream boundaries of the site to capture sediment
                       from leaving the site.

                    2. A shakedown area is to be installed at the construction entry/exit to the site to
                       minimise sediment being transported to and from the site.

                    3. Ensuring stockpiles and construction materials are contained using sediment
                       fencing downstream of these areas.

                    4. Turfed diversion swales may be provided at upstream boundaries to divert surface
                       run-off around exposed earthwork areas.



                    4. 2. O P E R A T I O N A L P H A S E

            Each site is approximately 650m², significantly below the development area threshold of
            2,500m² as described in the SPP2017 Appendix 2: Stormwater Management Design
            Objectives. In line with best practice stormwater management however, the development
            will provide the following treatment measures to minimise any impacts arising from the
            development.

                    •   First-flush divertors will be installed for roof-water drainage to divert initial run-off
                        capture to irrigation of the vegetated areas on site.
                    •   A 3,000L Slimline Rainwater tank per unit will be used to capture roof run-off, with
                        50% of the tank volume allocated to reuse, and 50% to attenuation storage.
                    •   Ocean Protect Ocean Guard Litter baskets (or similar) are to be provided to the
                        driveway inlet pits minimise sediment and gross pollutants from entering the
                        drainage line. Refer to Appendix B Ocean Protect Ocean Guard Litter Basket for
                        details.
                    •   A turfed buffer zone will be provided at the drainage outlet of each site to provide
                        additional filtering of pollutants, nutrient uptake and reduced flow rates from the
                        site.


            As each proposed development is a residential duplex replacing an existing dwelling upon
            the site, the proposed measures are considered to provide a practical stormwater
            management solution that takes into account the site constraints and nature of the
            development. It is considered that providing the proposed treatment train will achieve the
            performance outcomes of the Noosa Shire Council PSP Water Quality and Drainage Code
            PO6.




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