Mannum to Mypolonga Volume 1A
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River Murray and Lower Lakes Catchment Risk Assessment Project for Water Quality—Mannum to Mypolonga Trial For further information please contact: Environment Protection Authority Murraylands Office State Flora Centre Bremer Road, Murray Bridge (Post: GPO Box 1508 Murray Bridge 5253) Telephone: (08) 8539 2122 EPA web site: www.epa.sa.gov.au RMCWMB: www.rivermurray.sa.gov.au/major/risk_assessment.htm ISBN 1 876562 79 X June 2005 The River Murray and Lower Lakes Catchment Risk Assessment Project for Water Quality— Mannum to Mypolonga Trial Mellissa Bradley and Karla Billington June 2005 Environment Protection Authority South Australia Acknowledgements The River Murray and Lower Lakes Catchment Risk Assessment Project for Water Quality—Mannum to Mypolonga Trial was a collaborative project between the Environment Protection Authority, the River Murray Catchment Water Management Board and SA Water. The project team would like to thank those who attended the workshops, provided advice to the team or reviewed the final reports. The project team also recognises the late Max Schmidt, who took the photograph on the front cover of this report. Ashwood Caesar District Council of Loxton Waikerie Dr. Daniel Deere Mid Murray Council Dr Barry Hart Rural City of Murray Bridge Dr. Annette Davison District Council of Renmark Paringa Bruce Whitehill Coorong District Council Peter Goonan, EPA Berri Barmera Council Cathryn Hamilton, SA Water Alexandrina Council Natalie Caon, SA Water Glyn Ashman, SA Water Monique Aucote, Lower Murray Irrigation Michael Manou, EPA Kerri Muller, River Murray Catchment Water Management Board Gillian Smith, EPA Tony Sluzius, EPA Eddie Verhoef, EPA Caroline Michalski, DWLBC Sarah Wilson, Lower Murray Irrigation ii Table of Contents Summary ......................................................................................v 1 Purpose of project..................................................................1 1.1 Objectives of trial project ................................................................. 2 1.2 Regional NRM planning...................................................................... 2 1.3 Development planning ...................................................................... 3 2 Context ................................................................................4 2.1 Assets, services and threats................................................................ 4 2.2 Legislative framework....................................................................... 4 2.3 Role of key project partners in water quality protection and management ....... 4 2.4 Other stakeholders .......................................................................... 5 2.5 Linkages to other projects ................................................................. 5 3 Risk assessment method ...........................................................7 4 Trial—Mannum to Mypolonga......................................................9 4.1 Overview ...................................................................................... 9 4.2 Purpose of trial............................................................................... 9 4.3 Data collation ................................................................................ 9 4.4 Trial area selection.........................................................................10 4.5 Environmental values and associated zones ............................................10 4.6 Hazard identification.......................................................................11 4.7 Risk analysis.................................................................................12 4.8 Outcomes of preliminary risk assessment...............................................12 4.9 Strategies and actions to address priority risks ........................................27 4.10 Human resources............................................................................32 4.11 Project sponsor..............................................................................32 4.12 Project manager ............................................................................32 4.13 Principal catchment risk assessment adviser...........................................32 4.14 Catchment risk advisers ...................................................................33 4.15 GIS contractor ...............................................................................33 5 Expansion of trial to entire River Murray .................................... 34 5.1 Sub-regions ..................................................................................34 5.2 Outputs .......................................................................................34 5.3 Method........................................................................................34 5.4 Human resources............................................................................35 5.5 Budgets .......................................................................................37 6 Conclusion .......................................................................... 38 Appendix A. Asset services and threats and legislative framework ........ 39 Appendix B. Trial area ............................................................... 42 Appendix C. Environmental value zones ......................................... 43 Appendix D. Hazard and risk assessment tables................................ 46 Appendix E. Sample maps for water quality risk analysis .................... 68 iii Appendix F. Glossary .................................................................87 Appendix G. Reference...............................................................87 Appendix H. Addendum to Mannum to Mypolonga Trial through Stage 2 Risk Assessment. ............................................88 List of Figures Figure 1. Framework for catchment risk management. ................................................7 Box 1. Overview of risk as a product of likelihood and consequence ........................... 12 Figure 2. Risk distribution and associated styles of management .................................. 19 Figure 3. Risk distributions for raw water quality..................................................... 21 Figure 4. Risk distributions for recreation.............................................................. 23 Figure 5. Risk distributions for aquatic ecosystems................................................... 26 Box 2. Pollution study case study: Impact of dairy effluent on raw water quality at Pompoota............................................................................ 32 List of Tables Table 1. Assets, services and threats and corresponding environmental values. .................4 Table 2. Information for likelihood and consequence interpretation. ..............................9 Table 3. Associated impact of pollutant for each environmental value. ......................... 11 Table 4. Overview of significant risks to raw water quality ........................................ 15 Table 5. Overview of significant risks to recreational use .......................................... 16 Table 6. Overview of significant risks to aquatic ecosystems ...................................... 18 Table 7. Action plan....................................................................................... 29 Table 8. Key tasks for risk assessment for each LAP area........................................... 35 Table 9. River Murray risk assessment project implementation schedule. ....................... 36 Table 10. Income............................................................................................ 37 Table 11. Expenditure, May 2004–Jun 2005 (1.2 years) ............................................... 37 iv Summary The River Murray Catchment Risk Assessment for Water Quality has been established to help stakeholders who have an interest in catchment management to prioritise actions to best mitigate risks to water quality. The project is being driven by the business needs of the Environment Protection Authority (EPA), the River Murray Catchment Water Management Board (RMCWMB) and SA Water. It will be a practical tool to guide strategic planning and investment opportunities for the Murray Darling Basin South Australia Integrated Natural Resources Management Group. The project will consider risks to water quality in South Australia along the River Murray as well as the Lower Lakes. The Mannum to Mypolonga trial was undertaken to test the risk assessment techniques developed for the project and to establish the human, information and financial resources needed for the full implementation of the project. Hazards were identified and risks determined for the environmental values of raw water quality, recreation and aquatic ecosystems in line with the Environment Protection (Water Quality) Policy 2003 (SA). Hazards that may affect the environmental values selected for this project present direct risks or may contribute to risk. They include: pathogens (direct health implications for raw and recreational uses), nutrients (a cause of algal growth which can be toxic to humans and reduce oxygen availability to aquatic ecosystems) and turbidity (affects water treatment for raw supplies and changes optical properties for recreational use and aquatic ecosystems). A qualitative risk assessment approach was used to prioritise risks at a general level. The level of certainty in the assessment was described and, where required, additional quantitative