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Lower Brown Hill Creek and Keswick Creek Upgrades

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Lower Brown Hill Creek and Keswick Creek Upgrades Lower Brown Hill Creek and Keswick Creek Upgrades Concept Report Brown Hill Keswick Creek Stormwater Project March 2016 Ref No. 20120679-R5B Document History and Status Rev Description Author Reviewed Approved Date A Draft for Client Comment CLB MdeH December 2015 B Issued for final review CLB MdeH MdeH March 2016 © Tonkin Consulting 2015 This document is, and shall remain, the property of Tonkin Consulting. The document may only be used for the purposes for which it was commissioned and in accordance with the Terms of Engagement for the commission. Unauthorised use of this document in any form whatsoever is prohibited. Ref No. 20120679-R5B Lower Brown Hill Creek and Keswick Creek Upgrades Concept Report Contents 1 Introduction 2 1.1 Background Information 4 1.1.1 Brown Hill and Keswick Creek Survey and Hydraulic Assessment, 2012, AWE 4 1.1.2 Stormwater Management Plan, 2012, WorleyParsons 4 1.1.3 Part B Report, BHKCSP WorleyParsons 4 1.2 Existing Channel Characteristics 5 2 Previous Investigations 6 2.1 LBHC Main Channel Upgrade (Anzac Highway to Watson Avenue) 6 2.1.1 Stage 1 Engineering Feasibility Report, Draft 2013/Interim 6 2.1.2 Stage 1 Limited Environmental Site History – LBHC, 2013 7 2.1.3 Lower Brown Hill Creek Channel Upgrade – Channel Assessment - Revised Hydrology, 2013, Tonkin Consulting 8 2.1.4 Revised Hydraulic Modelling (2015), WorleyParsons 8 2.2 Keswick Creek Diversions 10 2.2.1 Keswick Creek to Brown Hill Creek Diversions, Tonkin Consulting 10 2.2.2 Stormwater Management Plan, 2012, WorleyParsons 12 2.2.3 Keswick Creek Diversion – Options Report, 2013, Tonkin Consulting 12 2.2.4 Keswick Creek Bypass (City of West Torrens) Options Report, 2013, Tonkin Consulting 12 2.2.5 Lower Brown Hill Creek Channel Upgrade – Channel Assessment - Revised Hydrology, 2013, Tonkin Consulting 13 2.2.6 WorleyParsons Revised Hydraulic Modelling (2015) 13 2.2.7 Anzac Highway Culvert Review, 2015, Tonkin Consulting 14 3 Concept Plan 15 3.1 Engineering Survey and Project Chainages 15 3.1.1 Lower Brown Hill Creek Chainages 15 3.1.2 Keswick Creek Chainages 17 3.1.3 Chainage Discrepancies 17 3.2 Water and Sewer Services 17 3.3 Showgrounds Development 17 3.4 Workshop and Site Inspection 17 3.5 Concept Design 18 4 Cost Estimate 20 4.1 Scope 20 5 Recommendation 23 5.1 Preferred Concept 23 5.2 Recommendation 23 6 References 24 Ref No. 20120679-R5B Lower Brown Hill Creek and Keswick Creek Upgrades Concept Report Tables Table 4.1 Cost Estimate – March 2016 22 Figures Figure 1.1 Locality Plan 3 Figure 2.1 Extent Lower Brown Hill Creek Upgrades 9 Figure 2.2 Keswick Creek Diversion Options 11 Figure 3.1 Chainage Comparison 16 Appendices Appendix A Existing Creek Characteristics Appendix B Photos – Creek walkthrough December 2015 Appendix C Recommended design flow rates (Scenario #31, December 2015) Appendix D Concept Design Drawings Appendix E Cost Estimate (Costplan) Ref No. 20120679-R5B Lower Brown Hill Creek and Keswick Creek Upgrades Concept Report 1 Introduction Tonkin Consulting was engaged by the City of Unley on behalf of the Brown Hill Keswick Creek Stormwater Project (BHKCSP) for the catchment councils of Adelaide, Burnside, Mitcham, Unley and West Torrens, to undertake an options and feasibility study for the upgrade of lower Brown Hill Creek (LBHC) downstream of Anzac Highway. The project is required to contain a 100 year ARI stormwater flow within the main channel and the diversion of a portion of the Keswick Creek flow into lower Brown Hill Creek at Anzac Highway. Lower Brown Hill Creek extends for a length of 3300 metres from Anzac Highway to its confluence with Keswick Creek on the south eastern side of Adelaide Airport at Netley. Keswick Creek starts from the confluence of Parklands Creek and Glen Osmond Creek at Wayville and extends through the western suburbs until it joins Brown Hill Creek at Netley on the south eastern side of the Airport. The diversion of portion of the flow from Keswick Creek into lower Brown Hill Creek at Anzac Highway is an integral part of the overall flood mitigation solution proposed in the 2012 stormwater management plan (refer Section 1.1.1) and is included in this report. A number of reports have been prepared regarding the technical and broader impacts of the lower Brown Hill Creek upgrade including the Keswick Creek diversion. The intention of this report is to concisely summarise the historical reports produced to date and outline the current preferred solution (at concept planning level) for the Lower Brown Hill Creek and Keswick Creek upgrades to accommodate the 100 year peak flow from the combined catchments. The locality plan is presented in Figure 1.1. Ref No. 20120679-R5B Lower Brown Hill Creek and Keswick Creek Upgrades Concept Report 2 Figure 1.1 Locality Plan Ref No. 20120679-R5B Lower Brown Hill Creek and Keswick Creek Upgrades Concept Report 3 1.1 Background Information The Brown Hill and Keswick Creek catchment has been reported on for a number of years. A significant flood mitigation study was presented in the Brown Hill and Keswick Creeks Flood Mitigation Study Flood Management Master Plan (Hydro Tasmania, 2006) for the Patawalonga Catchment Water Management Board (now part of the Adelaide and Mount Lofty Ranges Natural Resources Management Board). Two further studies have been carried out on the catchment for the BHKCSP, as described below. In 2010, the BHKCSP engaged WorleyParsons to revise the 2006 Master Plan. The resulting report (dated August 2012) was approved by the Stomwater Management Authority (SMA) as the Stormwater Management Plan (SMP) for the catchment in 2013 (the ‘2012 SMP’). In developing the 2012 SMP WorleyParsons, in accordance with its brief, subcontracted the floodplain modelling to Hydro Tasmania Consulting (HTC). The two dimensional floodplain model used for the catchment investigations of the 2006 Master Plan and the 2012 SMP was developed and run by HTC using the Mike-FLOOD proprietary software. In mid-2013, the BHKC project had the model transferred to WorleyParsons with the role to upgrade and run the model for all investigations involving Brown Hill and Keswick Creeks. 1.1.1 Brown Hill and Keswick Creek Survey and Hydraulic Assessment, 2012, AWE A Channel Capacity Assessment report of lower Brown Hill Creek and Keswick Creek (including Parklands Creek and Glen Osmond Creeks as tributaries to Keswick Creek) was completed in 2012 by Australian Water Environments (AWE) for the Adelaide and Mount Lofty Ranges Natural Resources Management Board (AMLRNRMB). A comprehensive survey of the four creeks and channel capacity estimates were last undertaken in 1983 (by WBCM). A one dimensional hydraulic model was used to estimate the flows that could be contained within the banks of the creeks. The model used surveyed cross sections collected by Hennig and Co along with observations made through a series of field inspections to assign model parameters. 1.1.2 Stormwater Management Plan, 2012, WorleyParsons The 2012 SMP covers the whole of Brown Hill Creek. That report defines the design flow for Lower Brown Hill Creek main channel as 60m3/s, which includes stormwater flow diverted from the Keswick Creek. The proposed channel upgrade (for the purposes of capacity assessment and costing) was a vertical-sided concrete lined channel 8m wide by 2m high but it was noted that there are alternatives which may be more acceptable to the community. It also identified that property acquisition and bridge upgrades would be required. 1.1.3 Part B Report, BHKCSP WorleyParsons The 2014 Part B report describes the works essentially upstream of Anzac Highway (‘upper Brown Hill Creek’). A critical element of this report is that it describes the 2013 updated hydrology prepared by the Department of Planning Transport and Infrastructure (DPTI). The updated hydrology is an outcome of updates to the 1987 Australian Rainfall and Runoff IFD data (as used in the 2012 SMP) together with an allowance for storage in the catchment and has resulted in lower peak flows generally throughout the catchment, including peak flows in Brown Hill and Keswick Creeks arriving at Anzac Highway. Ref No. 20120679-R5B Lower Brown Hill Creek and Keswick Creek Upgrades Concept Report 4 1.2 Existing Channel Characteristics The characteristics of the existing LBHC downstream of Anzac Highway and Keswick Creek channel segments have previously been summarised and documented. This summary (updated to match the consistent project-wide chainages) is provided in Appendix A. A detailed creek walkthrough from Anzac Highway downstream to the Keswick Creek confluence was undertaken in December 2015 in which the concepts developed were reviewed against the channel characteristics. Appendix B includes a series of photos from the walkthrough. Ref No. 20120679-R5B Lower Brown Hill Creek and Keswick Creek Upgrades Concept Report 5 2 Previous Investigations 2.1 LBHC Main Channel Upgrade (Anzac Highway to Watson Avenue) As part of the feasibility study for the LBHC upgrade the following reports have been prepared: Draft Channel Upgrade Stage 1 Engineering Feasibility (Tonkin Consulting 2013) Stage 1 Limited Environmental Site History (Tonkin Consulting 2013) Revised Hydrology Channel Options (Tonkin Consulting 2014) Channel Upgrade Stage 1 Engineering Feasibility (Tonkin Consulting 2014) Revised Hydraulic Modelling (Worley Parsons 2015)1 Lower Brown Hill Creek Channel Upgrade – Stage 1 Engineering Feasibility Report, Draft 2013/Interim 2014, Tonkin Consulting. The scope of the above reporting has included both technical and non-technical aspects of the upgrade of lower Brown Hill Creek. 2.1.1 Stage 1 Engineering Feasibility Report, Draft 2013/Interim The 2014 Interim report included a description of the existing creek including zoning, current land use, vegetation, services, transportation connectivity, amenity and channel treatment (natural earth, concrete, etc.), constructability, land ownership and easements.
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