Eyre Peninsula Long Term Plan Exec Summary
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MEETING FUTURE DEMAND SA WATER’S LONG TERM PLAN FOR EYRE REGION November 2008 Front cover image: Port Neill, Eyre Peninsula SAW12863 Long Term Plan Report Cover A4 ƒ.indd 2 26/11/08 11:02:10 AM Forward Meeting Future Demand – SA Water’s Long Term Plan for Eyre Region is an initiative of the South Australian Government, through SA Water, to establish a framework to ensure Eyre Peninsula has a secure water supply to meet increases in demand for the next 25 years. The Long Term Plan presents a number of recommendations to better manage water systems and develop new sources of water for this important region of our State. Investigations into demand projections undertaken in developing this plan indicate a new source of water will be required for the region in 2014/15. However, these projections will be reviewed annually and the timing for a new resource assessed accordingly. Through careful planning we will know if we have to act sooner and what the best options will be. Desalination and an expansion of the Iron Knob – Kimba pipeline are two of the recommendations we will more fully investigate. Reviewing this information every year is a critical part of the planning process. It means our delivery of water security for Eyre Peninsula is based on the most up‐to‐date, sound data we have available. We will need to continue our monitoring and planning ahead, taking into account changes brought about by climate change, population growth and other development needs of Eyre Peninsula. Community engagement has been integral to the development of the Long Term Plan with a number of information sessions, forums and opportunities for comment included in the process. This has resulted in the Eyre Peninsula community having significant input into, and providing their endorsement of, the Long Term Plan. The Eyre Peninsula, along with the rest of the State, is experiencing the worst drought conditions in recorded history. While this severe drought has reminded us our climate can have devastating impacts, we also have to ensure we are prepared for the longer term impacts of climate change, including likely reduced rainfall and reduced inflows into farm dams and waterways. This Long Term Plan is an adaptive management tool that can respond to changing environments to ensure security of water supply to the Eyre Region for the next 25 years and beyond. Hon Karlene Maywald Minister for Water Security November 2008 The Plan in Action SA Water’s Long Term Plan for Eyre Region (Long Term Plan) is a new initiative intended to establish a framework for water security that is responsive to changing circumstances currently being experienced through drought conditions and climate change. The Long Term Plan provides for an annual review process in order to eensur such future changes are addressed and appropriate adjustments made to the Long Term Plan if required. In this context, the Long Term Plan has been structured as an adaptive management tool able to respond to changes in climate conditions, resource allocations and increases in demand. Since the writing of theg Lon Term Plan, changes to the condition of the groundwater resource at Polda Basin have been identified. The long term decline in recharge has had an impact on the Polda Basin that was unknown at the time of writing the Long Term Plan. Subsequent to the completion of the draft Long Term Plan the Department for Water, Land and Biodiversity Conservation (DWLBC) advised SA Water on 7 July 2008 that the annual water allocation from Polda Basin had been reduced from 326.4 ML/a to 283 ML/a, in response to reduced recharge. Given this, and in accordance with the fundamental principle of the Long Term Plan that assumptions will be reviewed as necessary, investigations have commenced into the status of the other groundwater basins in the southern Eyre Peninsula region, including the Lincoln and Uley South Basins. Salinity profiles taken from the production bores in the Lincoln Basin revealed a significantly reduced extent of fresh water in the lens. Results for Uley South showed no significant change in the available resource. As a consequence of the completion of these investigations, a number of initiatives are already in place and will contribute to a review of the Long Term Plan in 2009 in linee with th recommended annual review process. These initiatives include the following: • SA Water has temporarily ceased pumping from Polda Basin (other than for emergency situations) until a full assessment of the condition of the Basin can be undertaken. • SA Water is planning to reduce the amount of water it pumps from the Lincoln Basin. DWLBC, the Eyre Peninsula Natural Resources Management Board (EPNRMB) and SA Water have commenced a comprehensive monitoring program over the Uley South Basin to cover knowledge gaps in relation to the salt water/ freshwater interface at the coast in order to inform the 2009 review process. SA Water has commenced work on the recommendations contained in the Long Term Plan to investigate desalination and system enhancement as they relate to security of the potable supply. This Long Term Plan estimates that a new water source will be required in approximately 2014/15 based on a medium demand projection and 2011/12 based on a high demand projection. This timing was based on a range of assumptions, including SA Water’s existing allocations from the groundwater basins and assumptions regarding future demands. The work currently underway in response to the ongoing drought conditions will inform the 2009 review process and necessary adjustments will be made to the Long Term Plan if required. This may include changes to the timing for a new resource dependent upon the outcomes of the monitoring and research work under the combined management of DWLBC, EPNRMB and SA Water. Contents Executive Summary i 1 Background0B 1 1.1 References12B 1 1.2 Eyre13B Peninsula Water Summit March 2007 1 1.3 Long14B Term Plan Overview 2 1.4 Water15B Security Plan 4 1.5 Project16B Reporting Structure 4 1.5.1 Water54B Security Reference Group (WSRG) 5 1.5.2 Water55B Security Technical Group 6 1.5.3 SA56B Water Project Team 7 1.6 Previous17B Investigations (2003 Eyre Peninsula Water Supply Master Plan) 7 1.7 Whyalla18B Water Supply 8 1.8 Delivery19B Options 8 1.9 Areas20B Not Currently Supplied by SA Water 9 2 Community1B Engagement 10 2.1 Overview21B of Engagement Process 10 2.1.1 Overview57B 10 2.2 Community22B Response Report 11 3 2CommunityB Issues Addressed in the Long Term Planning Process 12 4 Demands3B 13 4.1 Overall23B Demands 13 4.2 Township24B Demands 16 4.2.1 Existing58B Demands 16 4.2.1.1 SA111B Water Information 16 4.2.1.2 Tourism112B Demand 19 4.2.1.3 Population113B Information (Census) 20 4.2.1.4 Dwelling114B Information 21 4.2.2 Future59B Demands 22 4.2.2.1 Low115B Projection 22 4.2.2.2 Medium116B Projection 25 4.2.2.3 High117B Projection 27 4.2.2.4 Townshi118B p Demand Scenarios 29 4.3 Rural25B Demands 30 4.3.1 Existing60B Demands 30 4.3.1.1 SA119B Water Information 30 4.3.1.2 Stock120B Numbers 30 4.3.2 Future61B Demands 31 4.4 Overall26B Demands 32 i 5 South4B Australia’s Strategic Plan 34 5.1 Relevant27B Objectives of South Australia’s Strategic Plan 34 6 Existing5B Sources 37 6.1 References28B 38 6.2 Groundwater29B 38 6.2.1 Background62B and Description 38 6.2.2 Southern63B Basins 39 6.2.3 Musgrave64B Area 40 6.2.4 Robinson65B Lens 40 6.2.5 Groundwater66B Trends 40 6.2.6 Resource67B Management 41 6.2.7 Rece68B nt Investigations into Uley South 43 6.2.8 Future69B Investigations 44 6.3 River30B Murray 44 6.4 Surface31B Water 45 6.4.1 Introduction70B 45 6.4.2 The71B Tod River 45 6.5 Non32B ‐potable schemes 46 6.5.1 Stormwater72B Harvesting 46 6.5.2 Wastewater73B Reuse 47 6.5.2.1 Port121B Lincoln 47 6.5.2.2 Community122B Wastewater Management Schemes 47 6.5.3 Rainwater74B Tanks 48 6.6 Overview33B of Current Supply Situation 48 7 Alternative6B Sources 50 7.1 References34B 50 7.2 Introduction35B 50 7.3 Desalination36B 52 7.3.1 North75B West Desalination (possibly located at Ceduna or near Penong) 54 7.3.1.1 Supply/Demand123B Balance 55 7.3.1.2 Benefits124B and Risks 56 7.3.2 Lower76B Site (Possibly located at Cathedral Rocks) 56 7.3.2.1 Benefits125B and Risks 57 7.3.2.2 Supply/Demand126B Balance 59 7.4 Water37B Quality Improvement of Tod Reservoir 60 7.4.1 Option77B Overview 60 7.4.2 Potential78B Additional Supply Volumes 61 7.4.3 Benefits79B and Risks 61 7.4.4 Supply/Demand80B Balance 62 7.5 Further38B Expansion of the Iron Knob‐Kimba Transfer Pipeline 62 7.5.1 Option81B Overview 62 7.5.1.1 Stage127B 2 Works 63 ii 7.5.2 Benefits82B and Risks 64 7.5.3 Supply/Demand83B Balance 64 7.6 Transfer39B Pipeline from Whyalla to supply East Coast of Eyre Peninsula 65 7.6.1 Option84B Overview 65 7.6.2 Benefits85B and Risks 66 7.6.3 Supply/Demand86B Balance 67 7.7 Increased40B Use of the Peninsula’s Groundwater 67 7.7.1 Option87B Overview 67 7.7.2 Potential88B Additional Supply Volumes 68 7.7.3 Option89B 68 7.7.4 Benefits90B and Risks 69 7.7.5 Supply/Demand91B Balance 70 7.8 Estimated41B cost range of options 71 7.9 Other42B Considerations 72 7.9.1 Water92B Quality (large‐scale water softening plant) 72 7.9.1.1 Water128B Softening 73 7.9.1.2 Calgon129B 73 7.9.2 Contingency93B Planning and Future Use of Tod Reservoir 74 7.9.3 Upgrade94B of Dam Wall 74 7.9.4 Recreational95B Use of Tod Reservoir 74 7.9.5 Summary96B of Issues 75 7.9.6 SA97B Water’s Asset Management Plan for Eyre Region 76 7.10 Potable43B Substitution and Reduction 76 7.10.1 Artificial98B Catchments 76 7.10.2 Wastewater99B Reuse 77