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Asset Environmental Management Plan for 2005/2006

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Asset Environmental Management Plan for 2005/2006 Asset Environmental Management Plan for 2005/2006 Published by Murray-Darling Basin Commission Postal Address GPO Box 409, Canberra ACT 2601 Office location Level 5, 15 Moore Street, Canberra City Australian Capital Territory Telephone (02) 6279 0100 international + 61 2 6279 0100 Facsimile (02) 6248 8053 international + 61 2 6248 8053 E-Mail [email protected] Internet http://www.mdbc.gov.au For further information contact the Murray-Darling Basin Commission office on (02) 6279 0100 This report may be cited as: The Lower Lakes, Coorong and Murray Mouth Asset Environmental Management Plan 2005/2006 MDBC Publication No. 29/05 ISBN 1 921038 60 8 © Copyright Murray-Darling Basin Commission 2005 This work is copyright. Graphical and textual information in the work (with the exception of photographs and the MDBC logo) may be stored, retrieved and reproduced in whole or in part, provided the information is not sold or used for commercial benefit and its source The Lower Lakes, Coorong and Murray Mouth Asset Environmental Management Plan 2005/2006 is acknowledged. Such reproduction includes fair dealing for the purpose of private study, research, criticism or review as permitted under the Copyright Act 1968. Reproduction for other purposes is prohibited without prior permission of the Murray-Darling Basin Commission or the individual photographers and artists with whom copyright applies. To the extent permitted by law, the copyright holders (including its employees and consultants) exclude all liability to any person for any consequences, including but not limited to all losses, damages, costs, expenses and any other compensation, arising directly or indirectly from using this report (in part or in whole) and any information or material contained in it. C o n t e n t s SUMMARY ..............................................................................................................5 1. INTRODUCTION ...................................................................................................9 1.1 The Living Murray: An impetus for change ..........................................9 1.2 About this document ...........................................................................12 2. BACKGROUND ..................................................................................................15 2.1 Location and description .....................................................................15 2.2 Values of the Asset ...............................................................................17 Environmental .................................................................................17 Ngarrindjeri Ruwe ...........................................................................19 Social and recreational ....................................................................22 Economic ..........................................................................................22 2.3 Current water management within the Asset ...................................24 3. ENVIRONMENTAL CONDITION .......................................................................26 3.1 Processes driving Asset ecology ...........................................................26 Conceptual model for the Lower Lakes .........................................27 Conceptual model for the Coorong ...............................................28 3.2 Ecological status ...................................................................................32 Waders/water birds .........................................................................32 Fish ....................................................................................................33 Macroinvertebrates .........................................................................34 Aquatic plant communities .............................................................35 Water levels in the South Lagoon ..................................................36 3.3 Key threats ............................................................................................36 Change in hydrological regime ......................................................36 Murray Mouth congestion ..............................................................39 Water quality ...................................................................................39 Other ................................................................................................40 4. ECOLOGICAL OBJECTIVES AND TARGETS ...................................................43 4.1 Living Murray objectives ......................................................................43 4.2 Interim targets ......................................................................................44 4.3 Conceptual models for managing species ..........................................44 4.4 Flow requirements for the Asset .........................................................54 5. MANAGEMENT OPTIONS .................................................................................57 5.1 Delivering water to the Asset ...............................................................57 Releases from Lake Victoria and Menindee Lakes ........................58 Operation and modification of locks and weirs ...........................60 Eastern Mount Lofty Ranges ..........................................................61 Upper South East inflows ...............................................................62 Existing environmental water allocations .....................................64 S I G NI F I CA N T E COL OG I CA L A S S E T 1 C o n t e n t s 5.2 Managing water within the Asset ......................................................64 Barrage releases ..............................................................................65 Lake level manipulation ..................................................................68 Lock 1 releases .................................................................................71 Keeping the Murray Mouth open: Dredging ................................71 Information-based tools: Decision support ...................................72 5.3 Complementary management actions ................................................73 Water quality improvements ..........................................................73 Lakes and Coorong Fishery Management .....................................74 Other natural resources ..................................................................74 5.4 Prioritising competing management actions .....................................77 Decision Support System .................................................................77 Reference table ...............................................................................77 Risk management ............................................................................78 6. IMMEDIATE ACTIONS (2005-2006) ................................................................81 6.1 Delivering water to South Australia ...................................................81 Releases from Lake Victoria ............................................................81 Weir pool manipulation ..................................................................81 6.2 Management options for given flows ................................................81 6.3 Lock 1 releases ......................................................................................84 6.4 Barrage releases ....................................................................................84 6.5 Manipulating lake levels ......................................................................86 7. NEXT STEPS ........................................................................................................87 7.1 Consultation ..........................................................................................87 Development of the Plan ................................................................87 Implementation of the Plan ...........................................................89 7.2 Improving knowledge: Further investigations and modelling ..........90 Murray Mouth Morphological Model ............................................ 90 BigMod .............................................................................................90 Further investigations .....................................................................91 7.3 Monitoring ............................................................................................92 Monitoring framework for the Asset ............................................92 Monitoring and evaluation framework for the Murray-Darling Basin ......................................................................93 7.4 Adaptive management ........................................................................98 The concept .....................................................................................98 Applying adaptive management to the Asset ..............................99 REFERENCES ..........................................................................................................100 ABBREVIATIONS ........................................................................................................105 GLOSSARY ..........................................................................................................106 2 S I G NI F I CA NT E COL OG I CA L A S S E T C o n t e n t s APPENDICES ..........................................................................................................109 Appendix A: Living Murray
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