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Improving Water Quality in the Gulf and Port River

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Improving Water Quality in the Gulf and Port River Lefevre Peninsula Stormwater Management Plan Improving Water Quality in the Gulf and Port River How can stormwater runoff Importance of existing impact receiving waters? stormwater outflows to Stormwater runoff can impact receiving waters through the coast physical pollutants (e.g. plastic bags) as well as Stormwater drainage outfalls on the western side of through sediments, nutrients and pollutants carried by the Peninsula typically discharge to shallow stormwater. Sediments are particularly problematic in depressions at the rear of the coastal dune system. the shallow waters surrounding the Lefevre Peninsula In many cases, stormwater flows pass through trash because they cause turbidity, which restricts sunlight collection devices before entering these depressions, reaching the sea bed and contributes to seagrass loss. which are effective at infiltrating stormwater into the The nutrients found in stormwater can also have natural soil profile. These systems are highly effective negative impacts on reef and seagrass habitats by in reducing the volume of stormwater (and associated promoting the growth of invasive and toxic algae. pollutants) that enters the Gulf. Other contaminants such as trace metals and The SMP recommends that these collection devices hydrocarbons can accumulate in sediments and and infiltration basins be established and maintained organic matter, leading to a toxic effect in the food at all coastal outfall locations between Semaphore chain of marine ecosystems. South and Osborne. At some locations it will be necessary to establish infiltration basins as part of Improving water quality and broader coast protection initiatives that are designed reducing runoff volume to protect the dune system from storm surges and wave action. Important ongoing maintenance Improving water quality and reducing runoff volumes activities include the removal of accumulated are important goals of the draft SMP, and consistent pollutants (litter and sediments), weed management, with the Port Waterways Water Quality Improvement remediation of localised erosion, and care for dune Plan and Adelaide Coastal Waters Study. The SMP vegetation. recommends a range of measures that will help to improve the quality and reduce the volume of urban stormwater that is discharged to Port River, Barker Inlet and Gulf St Vincent, through: • Gross Pollutant Traps that physically prevent pollutants entering waterways • Infiltration systems, bioretention swales, constructed wetlands and raingardens which use vegetation and filtration to treat stormwater • Rainwater tanks and Aquifer Storage and Recovery (ASR) schemes that help to reduce the volume of stormwater runoff that is discharged to receiving waterways, and make stormwater available for beneficial uses Lefevre Peninsula Improving Water Quality Stormwater Management Plan in the Gulf and Port River Improving our open spaces How can I have my say? and streetscapes Council is interested in your feedback on the draft SMP, including the measures proposed to provide better The implementation of some of the works proposed in flood protection, manage stormwater and improve the the SMP provide opportunities to enhance existing open quality of water entering the Port River and Gulf St spaces on the Peninsula. Stormwater management Vincent. treatments such as swales and wetlands improve the 15 August appearance of open spaces, provide ‘nature play’ The consultation period commences on 2016 and concludes on 12 September 2016. opportunities and introduce water and new species that are suited to our climate. Proposed works have been developed in accordance with Council’s open space During this period, you can: plans to ensure they do not significantly impact upon • Talk to Council staff and members of the space available to the community for recreation. consultant team at drop in sessions scheduled for; In addition, other vegetated treatment systems such as o Saturday, 3 September, 2016 raingardens are proposed to be integrated with the 10am - 12 noon streetscapes, across the peninsula, improving at the Lefevre Community Stadium appearance and water management while also reducing o Wednesday, 7 September, 2016 the heat island effects that are associated with radiant 5.30 - 7.30PM heat from built surfaces. at the Port Districts Football Club (Largs Reserve) • Complete the online feedback form available at www.portenf.sa.gov.au • Complete a feedback from available at Council’s Port Adelaide Offices and the Semaphore Library • Provide a written submission to Council, addressed to; Lefevre Peninsula SMP Consultation, BIRKENHEAD NAVAL RESERVE City of Port Adelaide Enfield, How can residents and the PO Box 110 Port Adelaide SA 5015 community help to manage or via email to [email protected] stormwater runoff? Local residents can help to manage of stormwater How can I find out more? runoff in a number of ways. Installing and maintaining household rainwater tanks is an important way to For more information about the SMP, you can reduce the amount of stormwater runoff that enters • View the other information sheets available at receiving waters. www.portenf.sa.gov.au Residents can also improve water quality by preventing • View the draft SMP online at www.portenf.sa.gov.au leaf litter and pollutants entering the stormwater system, and by helping to maintain the vegetation and • View the draft SMP at Council’s Offices, removing rubbish from outflow areas, and stormwater 163 St Vincent Street, Port Adelaide. infiltration points. .
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