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Brown Hill Keswick Creek Stormwater Management Plan Part B Report

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Brown Hill Keswick Creek Stormwater Management Plan Part B Report Brown Hill Keswick Creek Stormwater Management Plan Part B Report September 2014 Table of Contents Acknowledgements ..................................................................................................................... 5 Executive Summary .................................................................................................................... 6 1 Introduction ..................................................................................................................... 11 2 Background ..................................................................................................................... 12 2.1 Introduction ............................................................................................................. 12 2.2 Part A Works ........................................................................................................... 13 2.3 Part B Works ........................................................................................................... 13 2.4 Other stormwater management measures ............................................................. 14 3 Part B Process ................................................................................................................. 17 3.1 Strategy for determining Part B Works ................................................................... 17 3.2 Stormwater Management Authority ........................................................................ 18 3.3 Upper Brown Hill Creek .......................................................................................... 18 3.4 Options investigated ............................................................................................... 20 3.5 Investigations .......................................................................................................... 21 4 Flood Modelling ............................................................................................................... 23 4.1 Overview ................................................................................................................. 23 4.2 Revised hydrology .................................................................................................. 24 4.3 Urban in-fill .............................................................................................................. 25 4.4 Climate change ....................................................................................................... 27 4.5 Modelling systems .................................................................................................. 27 4.6 Floodplain model upgrade ...................................................................................... 28 4.7 Creek roughness ..................................................................................................... 29 4.8 Creek capacity ........................................................................................................ 30 4.9 Floodplain modelling results ................................................................................... 32 5 Technical Investigations ................................................................................................ 42 5.1 Overview ................................................................................................................. 42 5.2 Overview of Brown Hill Creek ................................................................................. 46 5.3 Options A1, A2, B1 and B2 ..................................................................................... 50 5.4 Options C1, C2 and C3 ........................................................................................... 55 5.5 Option D .................................................................................................................. 56 5.6 Public road bridge upgrades ................................................................................... 63 6 Non-Technical Considerations ...................................................................................... 64 6.1 Maintaining the creek in good condition ................................................................. 64 6.2 Requirements for an easement or agreement ........................................................ 68 6.3 Environmental impacts ........................................................................................... 71 6.4 Community feedback .............................................................................................. 73 September 2014 Brown Hill Keswick Creek Stormwater Management Plan | Part B Report Page 1 7 Financial Considerations ............................................................................................... 81 7.1 Total cost estimates ................................................................................................ 81 7.2 Component cost estimates ..................................................................................... 81 7.3 Economic assessment ............................................................................................ 85 8 Selection of Preferred Option ........................................................................................ 89 8.1 Preliminary Assessment ......................................................................................... 89 8.2 Comparison of Options B1, B2 and D ..................................................................... 91 9 Project Implementation ................................................................................................ 102 9.1 Consultation and decision making ........................................................................ 102 9.2 Delivery strategy ................................................................................................... 103 9.3 Governance .......................................................................................................... 104 9.4 Funding ................................................................................................................. 105 9.5 Program ................................................................................................................ 105 References ............................................................................................................................... 106 Appendices 1 Maps of high flow bypass culvert options 2 Letter of advice concerning hydrology 3 Floodplain maps 4 Peak flow interaction between creeks 5 Potential creek capacity upgrade treatments 6 Concept sketches of dams 7 Areas of creek capacity upgrades 8 Cross-sectional impressions of culverts in streets 9 Typical channel dimensions 10 Orphanage Park options 11 Property Owners Guide to Managing Healthy Urban Creeks 12 Powers and responsibilities in relation to creeks 13 Potentially impacted trees along culvert routes 14 Consolidation of estimated costs 15 Estimated costs of dams 16 Extent of land potentially affected by the Site 2 dam and watershed 17 Estimated costs of high flow bypass culverts 18 Estimated costs of creek capacity upgrades, public bridge upgrades and creek rehabilitation 19 Estimated costs of easements September 2014 Brown Hill Keswick Creek Stormwater Management Plan | Part B Report Page 2 List of Abbreviations AMLRNRMB Adelaide and Mount Lofty Ranges Natural Resources Management Board ANCOLD Australian National Committee on Large Dams AR&R Australian Rainfall and Runoff ARI Average Recurrence Interval AWE Australian Water Environments BCR Benefit-Cost Ratio BHKC project Brown Hill Keswick Creek Stormwater Project BOM Bureau of Meteorology DEWNR Department of Environment, Water and Natural Resources DPA Development Plan Amendment DPTI Department of Planning, Transport and Infrastructure DTM Digital terrain model IFD Intensity-frequency-duration NRM Natural Resources Management OSD On-site detention RRR Rainfall Runoff Routing RCC Roller compacted concrete SOSCAG Save our Streets Community Action Group SOCKET Save Our Creek Environs Trees SMA Stormwater Management Authority SMP Stormwater Management Plan USA University of South Australia WSUD Water sensitive urban design WBCM Wood Bromley Carruthers & Mitchell September 2014 Brown Hill Keswick Creek Stormwater Management Plan | Part B Report Page 3 Reference to streets and roads Angas Road Hawthorn Anzac Highway Ashford Arundel Avenue Millswood Avenue Street Millswood Ayr Avenue Torrens Park Belair Road Hawthorn Charles Street Forestville Chelmsford Avenue Millswood Clifton Street Millswood Cranbrook Avenue Millswood Cross Road Unley Park / Hawthorn Devon Street Goodwood Devonshire Street Hawthorn Douglas Street Millswood Ethel Street Forestville Fife Avenue Torrens Park Fisher Street Fullarton Foster Street Forestville George Street Hawthorn Goodwood Road Goodwood Grove Street Unley Park Hampton Street Unley Park Heywood Avenue Unley Park Hilda Terrace Hawthorn Jervois Street Hawthorn Kent Street Hawthorn King William Road Unley Leah Street Forestville Malcolm Street Millswood Mitchell Street Millswood Muggs Hill Road Torrens Park Northgate Street Unley Park Oakley Avenue Millswood Regent Street Millswood Unley Road Unley Vardon Terrace Millswood Victoria Street Goodwood Windsor Street Unley Wood Street Millswood Wurilba Avenue Hawthorn September 2014 Brown Hill Keswick Creek Stormwater Management Plan | Part B Report Page 4 Acknowledgements The Brown Hill Keswick Creek Stormwater Project acknowledges the work of the following organisations in contributing to
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