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Stormwater Management Plan 2012 THE CITIES OF ADELAIDE, BURNSIDE, MITCHAM, U NLEY AND WEST TORREN S BROWN HILL KESWICK CREEK STORMWATER PROJECT STORMWATER MANAGEMENT PLAN 2012 301015-02356wjh120801-REP-0006 - BHKC SMP 2012 - Final.doc 10th August 2012 Water Resources 145 South Terrace Adelaide 5000 Australia Tel: +61 8 8125 0000 www.worleyparsons.com WorleyParsons Services Pty Ltd ABN 61 001 279 812 © Copyright 2012 Services Pty Ltd THE CITIES OF ADELAIDE, BURNSIDE, MITCHAM, UNLEY AND WEST TORRENS BROWN HILL KESWICK CREEK STORMWATER MANAGEMENT PLAN Do not delete this line Disclaimer This report has been prepared on behalf of and for the exclusive use of the Cities of Adelaide, Burnside, Mitcham, Unley and West Torrens, and is subject to and issued in accordance with the agreement between the Cities of Adelaide, Burnside, Mitcham, Unley and West Torrens and WorleyParsons Services Pty Ltd. WorleyParsons Services Pty Ltd accepts no liability or responsibility whatsoever for it in respect of any use of or reliance upon this report by any third party. Copying this report without the permission of the Cities of Adelaide, Burnside, Mitcham, Unley and West Torrens or WorleyParsons Services Pty Ltd is not permitted. MIKE Flood computer modelling results generated by Australian Water Environments and Hydro Tasmania have been relied upon in the preparation of this report. WorleyParsons has reviewed the processed results that have been provided by AWE, but otherwise has no direct access to the model and therefore, accepts no responsibility for the accuracy of results from the model. Acknowledgements In addition to components of the work completed by AWE, Hydro Tasmania and Evans & Peck, WorleyParsons wishes to acknowledge the contributions to this Stormwater Management Plan made by the Cities of Burnside, Adelaide, Mitcham, Unley and West Torrens, the Adelaide and Mount Lofty Ranges Natural Resources Management Board, the Department of Planning, Transport and Infrastructure and the BHKC Project Director. Cover Photo: Flooding in Culvert Street, Unley (Glen Osmond Creek) in April 2010 Project: 301015–02356 BROWN HILL KESWICK CREEK STORMWATER MANAGEMENT PLAN 2012 REV DESCRIPTION AUTHOR REVIEWER WORLEY- DATE CLIENT DATE PARSONS APPROVAL APPROVAL A Issued for Internal Review WJH CRT 19/07/12 N/A W Honour C Thomas 0 Issued for Review WJH CRT 10/08/12 N/A W Honour C Thomas 1 Final Report WJH CRT N/A W Honour C Thomas C Thomas 301015-02356wjh120801-REP-0006 - BHKC SMP 2012 - Final.doc page ii Final Report: Rev 1 THE CITIES OF ADELAIDE, BURNSIDE, MITCHAM, UNLEY AND WEST TORRENS BROWN HILL KESWICK CREEK STORMWATER MANAGEMENT PLAN EXECUTIVE SUMMARY Introduction This Stormwater Management Plan (SMP) covers the catchments of Brown Hill and Keswick Creeks, including Glen Osmond and Parklands Creeks, which are important drainage watercourses in metropolitan Adelaide. The creeks have a relatively high flood risk, a low standard of flood protection and a long history of flooding issues. The combined Brown Hill and Keswick Creeks catchment is mainly contained within the local government areas of Adelaide, West Torrens, Mitcham, Burnside and Unley. In 2008 the Stormwater Management Authority conditionally approved the 2006 Flood Management Master Plan as a stormwater management plan. However, due to subsequent community concerns, particularly in respect of proposed flood control dams in the upper reaches of Brown Hill Creek, the catchment councils and the Stormwater Management Authority agreed to prepare a revised stormwater management plan. WorleyParsons was engaged by the Brown Hill Keswick Creek Stormwater Project in 2010 to prepare this SMP as an update to the 2006 Flood Management Master Plan (2006 Master Plan). This SMP has been prepared in accordance with the Stormwater Management Planning Guidelines of the Stormwater Management Authority and with a range of objectives under the following headings: 1. Protection from flooding 2. Quality of runoff and effect on receiving waters 3. Beneficial reuse of stormwater runoff 4. Protection of watercourses and riparian ecosystems 5. Effective planning outcomes 6. Management of stormwater infrastructure A key objective is to provide a standard of flood protection equivalent to the 100 year Average Recurrence Interval (ARI) event or better (subject to economic justification). Presently, the system is generally considered to have about a 10 year ARI level of protection. Background Development of the 2006 Master Plan was carried out in three stages. The first stage was documented in the Flood Mitigation Study for Brown Hill and Keswick Creeks Stage 1 Technical Report (2005). Over 300 potential opportunities for mitigation works to reduce 301015-02356wjh120801-REP-0006 - BHKC SMP 2012 - Final.doc page iii Final Report: Rev 1 THE CITIES OF ADELAIDE, BURNSIDE, MITCHAM, UNLEY AND WEST TORRENS BROWN HILL KESWICK CREEK STORMWATER MANAGEMENT PLAN flooding were identified, including flood detention works, flow diversions and increasing channel and bridge capacities. Non-structural options were also considered and opportunities to include multi- purpose benefits also were identified. The second stage involved community consultation, which informed development of flood management measures, including a set of priority mitigation works. Final investigations involved hydraulic modelling to determine flood damages reduction provided by the works and development of the recommended flood management strategy. Floodplain modelling for the catchment was initially developed in 2003 and subsequently updated in 2006. Based on that modelling it is determined in the current investigation that damages for a 100 year ARI flood will cost about $187 Million and affect nearly 7,000 properties if no flood mitigation action is taken. Development of this revised stormwater management plan will be a two stage process involving this SMP (the 2012 SMP) followed by a Final SMP. Development of 2012 Stormwater Management Plan A key requirement of the current investigation, was to re-assess the proposed flood mitigation works in upper Brown Hill Creek of the 2006 Master Plan and investigate alternative options. WorleyParsons produced a report in August 2011 (the 2011 Draft SMP) in which the recommended infrastructure works for upper Brown Hill Creek included a flood control dam in Brown Hill Creek Recreation Park. The report was subject to community consultation in late 2011 from which there were significant community concerns about the proposed dam. Subsequently, other investigations into alternative options for a ‘no dam’ solution were investigated and found to be technically feasible. However, all options identified for upper Brown Hill Creek are subject to re-assessment as a result of updated information regarding the hydraulic capacity of the creek. In May 2012 the catchment councils endorsed a strategy for the commencement of designated Part A Works and a commitment to undertake further investigations over a 12 month period from the date of gazettal of the 2012 SMP in order to resolve the works for upper Brown Hill Creek under a Part B Works process. Central to the strategy is a preference to pursue a feasible and community acceptable ‘no dam’ solution of acceptable cost. The Part B Works, when determined in accordance with the process, will be incorporated into a Final SMP. Upper Brown Hill Creek Works Under the 2011 Draft SMP investigation the two flood control dams proposed as part of the 2006 Master Plan were re-assessed to determine the flood reduction benefit they provide in isolation to other works from the 2006 Master Plan. Conclusions from the analysis are that flood detention in the rural part of the catchment has a significant effect in mitigating flood impacts in the Brown Hill Creek catchment. It was also 301015-02356wjh120801-REP-0006 - BHKC SMP 2012 - Final.doc page iv Final Report: Rev 1 THE CITIES OF ADELAIDE, BURNSIDE, MITCHAM, UNLEY AND WEST TORRENS BROWN HILL KESWICK CREEK STORMWATER MANAGEMENT PLAN determined that a single flood control dam suitably located could provide nearly as much detention benefit as the two originally proposed dams. The analysis also showed that other measures are needed to mitigate flooding caused by overtopping of the Brown Hill Creek channel at locations between Cross Road and Anzac Highway, which leads to flow across the highway and consequent flooding through areas of West Torrens. Alternative Options for Upper Brown Hill Creek For the 2011 Draft SMP, alternative flood mitigation works were investigated for Brown Hill Creek upstream from Anzac Highway, including alternative configurations for upper catchment detention. A multi-criteria analysis was undertaken to identify a number of viable options for further more detailed consideration. They were considered by themselves or in combination to develop nine alternative scenarios: . Flood control dam in the Brown Hill Creek Recreation Reserve (Site 1); . Flood control dam at Site 2 (rural part of the upper BHC catchment); . Flood control dam at Site 2 + weir system along Brown Hill Creek; . Flood control dam at Site 2 + overland flow interceptor at the Glenelg Tramway (including downstream channel upgrade); . Flood control dam at Site 2 + supplementary works to prevent channel overtopping; . Overland flow interceptor at the Glenelg Tramway (including downstream channel upgrade); . Overland flow interceptor at the Keswick Creek diversion (at Leader Street, proposed as part of the 2006 Master Plan); . Small flood control dam at Site 1 + supplementary works to prevent channel
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