Gnangara Sustainability Strategy Appendix 1 Gnangara Groundwater System Zone Plans Draft for Public Comment
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An across-government initiative groundwater – biodiversity – land use July 2009 Gnangara sustainability strategy appendix 1 Gnangara groundwater system zone plans Draft for public comment An across-government initiative Department of Water Department of Agriculture and Food WA Department for Planning and Infrastructure Department of Environment and Conservation Gnangara sustainability strategy task force Department of Water 168 St Georges Terrace Perth Western Australia 6000 Telephone +61 8 6364 7600 Facsimile +61 8 6364 7601 www.gnangara.water.wa.gov.au © Government of Western Australia 2009 July 2009 This work is copyright. You may download, display, print and reproduce this material in unaltered form only (retaining this notice) for your personal, non-commercial use or use within your organisation. Apart from any use as permitted under the Copyright Act 1968, all other rights are reserved. Requests and inquiries concerning reproduction and rights should be addressed to the Department of Water. All maps in this publication were produced by the Department of Water (for the GSS Taskforce), with the intent that they be used for the Gnangara sustainability strategy (draft for public comment). While the Department of Water has made all reasonable efforts to ensure the accuracy of this data, the Department accepts no responsibility for any inaccuracies and persons relying on this data do so at their own risk. Gnangara sustainability strategy appendix 1: Gnangara groundwater system zone plans Draft for public comment GSS 3 ISBN 978-1-921637-43-8 (print) 978-1-921637-44-5 (online) ISSN 1836-1528 (print) 1836-1536 (online) Cover image Housing meets horticulture. Image supplied by the Department of Water. Gnangara Sustainability Strategy Appendix 1 Draft for public comment July 2009 Contents Gnangara groundwater system zone plans 1 Introduction 1 1 Zone 1 plan – West Gnangara, East Gnangara, Gnangara and Whiteman subareas 1 1.1 Overview 1 1.2 Allocation status of Zone 1 4 1.3 Issues 5 1.4 Objectives 5 1.5 Recommendations for the whole of Zone 1 with associated benefi ts and risks 6 1.6 Recommendations to address the water and land management issues in Zone 1 8 1.6.1 Public water supply management 8 1.6.2 Urbanisation and commercial use 8 1.6.3 Land use management 11 1.6.4 Biodiversity 14 2 Zone 2 plan – Carabooda, West Pinjar, Nowergup, Lake Pinjar, Neerabup, Carramar, Mariginiup and Lake Gnangara subareas 18 2.1 Overview 18 2.2 Allocation status of Zone 2 19 2.3 Issues 20 2.4 Objectives 20 2.5 Recommendations for the whole of Zone 2 with associated benefi ts and risks 21 2.6 Recommendations to address water and land management issues in Zone 2 23 2.6.1 Public water supply management 23 2.6.2 Urbanisation and commercial use 23 iii Gnangara Sustainability Strategy Appendix 1 Contents Gnangara groundwater system zone plans July 2009 2.6.3 Land use management 27 2.6.4 Biodiversity 30 3 Zone 3 plan – Bullsbrook, Ellenbrook Town and West Swan subareas 34 3.1 Overview 34 3.2 Allocation status of Zone 3 34 3.3 Issues 36 3.4 Objectives 36 3.5 Recommendations for the whole of Zone 3 with associated benefi ts and risks 37 3.6 Recommendations to address water and land management issues in Zone 3 39 3.6.1 Public water supply management 39 3.6.2 Urbanisation and commercial use 40 3.6.3 Land use management 41 3.6.4 Biodiversity 43 4 Zone 4 plan – Quinns Rock, Eglinton and Yanchep–Two Rocks subareas 45 4.1 Overview 45 4.2 Allocation status of Zone 4 45 4.3 Issues 46 4.4 Objectives 47 4.5 Recommendations for the whole of Zone 4 with associated benefi ts and risks 48 4.6 Recommendations to address water and land management issues in Zone 4 49 4.6.1 Public water supply management 49 4.6.2 Urbanisation and commercial use 50 4.6.3 Land use management 52 4.6.4 Biodiversity 53 5 Zone 5 plan – Gingin Brook 1,2,3 and 4 and Lake Mungala subareas 56 5.1 Overview 56 5.2 Allocation status of Zone 5 56 5.3 Issues 58 iv Gnangara Sustainability Strategy Appendix 1 Contents Gnangara groundwater system zone plans July 2009 5.4 Objectives 58 5.5 Recommendations for the whole of Zone 5 with associated benefi ts and risks 59 5.6 Recommendations to address water and land management issues in Zone 5 60 5.6.1 Public water supply management 60 5.6.2 Urbanisation and commercial use 60 5.6.3 Land use management 61 5.6.4 Biodiversity 63 6 Zone 6 plan – West Yanchep, East Yanchep and Banksia subareas 65 6.1 Overview 65 6.2 Allocation status of Zone 6 66 6.3 Issues 67 6.4 Objectives 67 6.5 Recommendations for the whole of Zone 6 with associated benefi ts and risks 68 6.6 Recommendations to address water and land management issues in Zone 6 70 6.6.1 Public water supply management 70 6.6.2 Urbanisation and commercial use 70 6.6.3 Land use management 72 6.6.4 Biodiversity 75 7 Zone 7 plan – Whitfords, Gwelup, Perth North and Cottesloe Peninsula subareas 79 7.1 Over view 79 7.2 Allocation status of Zone 7 80 7.3 Issues 81 7.4 Objectives 81 7.5 Recommendations for the whole of Zone 7 with associated benefi ts and risks 82 7.6 Recommendations to address the water and land management issues in Zone 7 83 7.6.1 Public water supply management 83 7.6.2 Land use management 85 7.6.3 B i o d i ve r s i t y 86 v Gnangara Sustainability Strategy Appendix 1 Contents Gnangara groundwater system zone plans July 2009 List of fi gures Figure 1 GSS subareas grouped into seven zones according to land use similarities 2 Figure 2 Zone 1 2008 licensed groundwater allocation – 39.9 gigalitres 3 Figure 3 Zone 1 public water supply borefi elds 17 Figure 4 Zone 2 2008 licensed groundwater allocation – 27.6 gigalitres 19 Figure 5 Zone 2 public water supply borefi elds 33 Figure 6 Zone 3 2008 licensed groundwater allocation – 16.6 gigalitres 35 Figure 7 Zone 3 public water supply borefi elds 44 Figure 8 Zone 4 2008 licensed groundwater allocation – 27.7 gigalitres 46 Figure 9 Zone 4 public water supply borefi elds 55 Figure 10 Zone 5 2008 licensed groundwater allocation – 23.6 gigalitres 57 Figure 11 Zone 6 2008 licensed groundwater allocation – 11.2 gigalitres 66 Figure 12 Zone 6 public water supply borefi elds 78 Figure 13 Zone 7 2008 licensed groundwater allocation — 84.6 gigalitres 80 Figure 14 Zone 7 public water supply borefi elds 89 Figure 15 Department of Water gazetted groundwater subareas 90 vi Gnangara groundwater system zone plans Introduction Gnangara Sustainability Strategy Appendix 1 Draft for public comment July 2009 The Gnangara sustainability strategy’s appendix 1: Gnangara groundwater system zone plans provide details of land use and water management at the subarea scale. For the purposes of developing the Gnangara sustainability strategy (GSS), the area covering the Gnangara groundwater system was subdivided into 30 subareas. These subareas were grouped into seven zones according to hydrological and land use similarities (Figure 1). Sections 1 to 7 provide an overview, highlight the major issues and list the GSS recommended options for each zone. This document should be read in conjunction with the Gnangara sustainability strategy situation statement, which provides the context for the GSS itself. The Situation statement provides detailed background description and highlights issues surrounding land and water use of the Gnangara groundwater system taken from current literature, government planning documents and government reports. It also presents an overview of governance mechanisms associated with land and water use of the system. 1 Gnangara Sustainability Strategy Appendix 1 Introduction Gnangara groundwater system zone plans July 2009 Figure 1 GSS subareas grouped into seven zones according to land use similarities 2 Zone 1 plan – West Gnangara, East Gnangara, Gnangara and Whiteman subareas Zone 1 Gnangara Sustainability Strategy Appendix 1 Draft for public comment July 2009 1.1 Overview Land Percentage of Subarea area ha total GSS area A main feature of Zone 1 is that it is predominantly crown land. Commercial pine plantation forestry is Gnangara 7666 3.6 the main land use within the Gnangara and West Gnangara subareas. Native Banksia woodland East Gnangara 6361 3.0 occurs on the East Gnangara subarea whilst Whiteman Park, as a regional recreation and West Gnangara 4096 1.9 conservation reserve, dominates the Whiteman subarea. Whiteman Park, managed by the Whiteman 4306 2.0 Department for Planning and Infrastructure, links to Gnangara Park over state forest managed by Local governments the Department of Environment and Conservation. These parks have regional ecological and social City of Wanneroo, Shire of Chittering, City of Swan values and offer diverse recreational and tourism Population in 2006 opportunities. Bush Forever sites are located across the zone, protecting regionally important bushland Gnangara – 26, East and West Gnangara – 0, and associated wetlands. Extensive sandmining Whiteman – 55 tenements are also present in this zone. Land form (surface geology) Zone 1 is bounded by urban land on the southern boundary of Whiteman Park, private property in Bassendean Dunes, lacustrine (peat, peaty sands) East Wanneroo to the west, rural holdings and Ellenbrook townsite to the east, and Banksia Wetlands woodland on state forest or RAAF managed lands to the north. The majority of the zone exists within Wetlands in Lexia and Melaleuca groups (21 the Priority 1 Water source protection area and is ministerial criteria sites), Horse Swamp, Hawkins predominantly publicly owned.