Natural Resources Management Act 2004 (NRM Act)
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Water Allocation Plan EASTERN MOUnt LOFTY RANGES For more information about this publication please contact: South Australian Murray-Darling Basin Natural Resources Management Board PO Box 2343 Murray Bridge SA 5253 Phone: (08) 8532 9100 Email: [email protected] Website: naturalresources.sa.gov.au/samurraydarlingbasin © State of South Australia through the Department of Environment, Water and Natural Resources. Apart from fair dealings and other uses permitted by the Copyright Act 1968 (Cth), no part of this publication may be reproduced, published, communicated, transmitted, modified or commercialised without the prior written approval of the Department of Environment, Water and Natural Resources. DISCLAIMER: While reasonable efforts have been made to ensure the contents of this publication are factually correct, the Department of Environment, Water and Natural Resources makes no representations and accepts no responsibility for the accuracy, completeness or fitness for any particular purpose of the contents, and shall not be liable for any loss or damage that may be occasioned directly or indirectly through the use of or reliance on the contents of this publication. Reference to any company, product or service in this publication should not be taken as a Department endorsement of the company, product or service. ISBN 978-1-921800-55-9 FIS 92544 Water Allocation Plan for the Eastern Mount Lofty Ranges South Australian Murray-Darling Basin Natural Resources Management Board Dedication This plan is dedicated to Cameron Welsh, Water Resources Manager at Natural Resources, SA Murray-Darling Basin for 2006-2013 who was tragically killed on Tuesday 26 November 2013. Cameron offered his energy, passion and commitment to the development of this plan. Water resources in the SA Murray-Darling Basin has lost a dedicated ambassador. TABLE OF CONTENTS 1 THE PRESCRIBED WATER RESOURCES ....................................................................................................................... 1 1.1 Introduction ................................................................................................................................................................. 1 1.1.1 Approach and objectives................................................................................................................................. 1 1.1.2 Role of a water allocation plan .................................................................................................................... 3 1.1.3 Structure of the Plan ........................................................................................................................................ 4 1.2 History of water management in the Eastern Mount Lofty Ranges ...................................................... 5 1.3 Overview of the Eastern Mount Lofty Ranges ................................................................................................ 7 1.4 Description of the prescribed water resources ............................................................................................ 13 1.4.1 Surface water and watercourse resources in the Eastern Mount Lofty Ranges PWRA ........... 13 1.4.2 Geology ............................................................................................................................................................... 14 1.4.3 Hydrogeology ................................................................................................................................................... 16 1.4.4 Description of surface water and underground water resources for each catchment within the Eastern Mount Lofty Ranges .................................................................................................. 20 1.5 Capacity of the water resources ........................................................................................................................ 25 1.5.1 Surface water and watercourse water resource capacity.................................................................. 26 1.5.2 Underground water resource capacity .................................................................................................... 28 1.5.3 Effects of climate variability and climate change on water resource capacity ......................... 31 1.6 Water demand .......................................................................................................................................................... 31 1.6.1 Indigenous business and cultural needs ................................................................................................. 32 1.6.2 Non-licensed water needs – stock and domestic water requirements ......................................... 33 1.6.3 Plantation forestry .......................................................................................................................................... 37 1.6.4 Other non-licensed water needs ................................................................................................................ 39 1.6.5 Licensed water demand estimates ............................................................................................................ 39 1.6.6 Future demands for water ............................................................................................................................ 40 2 ASSESSMENT OF THE NEEDS OF WATER-DEPENDENT ECOSYSTEMS ....................................................... 44 2.1 Introduction ............................................................................................................................................................... 44 2.1.1 Environmental water requirements .......................................................................................................... 44 2.1.2 Environmental water provisions ................................................................................................................ 45 2.2 Environmental water requirements of the Eastern Mount Lofty Ranges PWRA ............................ 45 2.2.1 Environmental water requirements provided by water on the surface........................................ 45 2.2.2 Environmental water requirements for underground water ............................................................ 59 2.2.3 Environmental water quality requirements ........................................................................................... 60 2.3 capacity of the water resource to meet environmental water ............................................................... 60 2.3.1 Evaluating environmental water requirements success using metrics......................................... 60 2.3.2 Relationship between metric results and environmental condition .............................................. 63 2.3.3 Ecological consequences of changes to the water regime ................................................................ 64 2.4 Environmental water provisions......................................................................................................................... 65 2.4.1 Environmental water provisions for underground water .................................................................. 66 2.4.2 Environmental water provisions for surface water and watercourse water ............................... 66 3 ASSESSMENT OF EFFECT ON OTHER WATER RESOURCES.............................................................................. 76 3.1 Murray-Darling Basin ............................................................................................................................................. 76 3.2 Western Mount Lofty Ranges Prescribed Water Resources Area ........................................................ 77 3.2.1 Interconnection with the Eastern Mount Lofty Ranges PWRA ........................................................ 77 3.3 Marne Saunders Prescribed Water Resources Area................................................................................... 77 3.3.1 Interconnection with the Eastern Mount Lofty Ranges PWRA ........................................................ 78 3.4 River Murray Prescribed Watercourse ............................................................................................................. 78 3.4.1 Interconnection with the Eastern Mount Lofty Ranges PWRA ........................................................ 78 vii 3.5 Unprescribed neighbouring catchments ........................................................................................................ 80 3.5.1 Interconnection with the Eastern Mount Lofty Ranges PWRA ........................................................ 80 4 THE WATER MANAGEMENT FRAMEWORK FOR THE PLAN ............................................................................ 81 4.1 Overall approach in setting the management framework ...................................................................... 81 4.1.1 Risk assessment................................................................................................................................................ 81 4.1.2 General approach for setting consumptive use limits ........................................................................ 82 4.1.3 Ecosystem allocations .................................................................................................................................... 84 4.2 Surface water and watercourse water management framework .......................................................... 84 4.2.1 Impacts