Attachment 1 - Stormwater Management Plan

            5. CONCLUSION
            This Stormwater Management Report has outlined how the stormwater run-off from the site
            is to be managed to comply with the relevant requirements and minimise any adverse
            impacts to the downstream catchments.

                    •   The existing site and upstream catchments’ drainage patterns currently discharge
                        from the site as overland flows into towards Lake Doonella to the south of the site.

                    •   The proposed legal point of discharge for the site will continue to be Lake Doonella.

                    •   The existing and proposed development site have been modelled for the critical
                        design storm events for the site, which found attenuation would be required. Further
                        modelling for the mitigated developed site was able to demonstrate that there will
                        be no increase to total existing discharge conditions from the site for any of the storm
                        events.

                    •   During construction, erosion and sediment control measures shall be implemented
                        to minimise potential contaminants impacting the downstream receiving
                        environment. An erosion and sediment control plan shall be developed as part of a
                        submission for Operational Works approvals.

                    •   In the operational phase of the development, a stormwater treatment train will
                        provide quality will be implemented in a manner consistent with the nature of the
                        proposed development. Roof run-off is to be directed towards 4 x 3,000L rainwater
                        reuse and attenuation tanks that will be fitted with first-flush divertors to will divert
                        initial roof run-off to on site irrigation of vegetated areas. The tanks are to be
                        plumbed for reuse for internal (laundry and toilets) purposes that will serve to
                        provide both treatment and reduce the volume of run-off leaving the site. Ocean
                        Protect Ocean Guard litter baskets will be provided to the pits within the driveway
                        areas to provide at source primary treatment. The piped drainage will be discharged
                        through a turfed buffer zone to provide treatment and flow rate reductions.

                    •   By implementing the proposed stormwater solution, it is considered that stormwater
                        layout proposed will minimise any adverse impacts to the downstream environment
                        arising from the stormwater run-off while also achieving the performance outcomes
                        required for the development.




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