Response to Information Request 20220004 -Tunba Court

                    PO9
                    On sloping sites development follows the natural landform wherever practical and
                    excavation or filling is minimal.

            The development has sought to create a level pad surface area on steeply sloping hillside,
            where following the natural landform would be impractical for this purpose. The
            earthworks which have been initially constructed are proposed to be modified in
            accordance with the Geotechnical Investigation Global Stability Assessment dated
            November 21 by Morrison Geotechnic reducing fill batter slopes and providing benched
            terraces between the cut slopes to ensure stability of the resulting earthworks.

                    PO11
                    Earthworks minimise any adverse impact upon groundwater, watercourses,
                    drainage lines, wetlands, and native vegetation.


            The earthworks have been carried out clear of watercourses, drainage lines, wetlands and
            native vegetation and are not expected to impact upon the vegetated area in proximity to
            the lower fill batter.

            The stormwater drainage system proposed for the earthworks has been designed in order
            to maintain the pre-development characteristics in so far as is practicable. Stormwater run-
            off that would have previously flowed overland into the vegetated area and gully to the
            north of the earthworks continues to discharge towards the gully. An energy dissipator
            provided at the outlet of the drainage system will minimise impacts of scour or erosion
            and encourage dispersion of concentrated flows at the outlet so that impacts of the run-
            off are reduced.


                           2.2. The Water Quality and Drainage Code – Performance Outcomes
                           PO1, PO2, PO5, PO6, PO10 and PO13.


                    PO1
                    The development and its stormwater management system is planned and designed
                    having regard to:

                       1. the natural features of the site;
                       2. the need to avoid impacts and potential risks to ecologically important
                          areas;
                       3. the likely effectiveness of erosion and sediment control and stormwater
                          drainage measures during rainfall events during and post construction; and
                       4. the need to protect environmental values and water quality of receiving
                          waters both during and post construction.

            The stormwater drainage for the development has been designed to minimise the
            impacts of the development upon the downstream receiving waters and maintain the flow
            characteristics of the downstream receiving environment as much as possible.




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