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Avon River Catchment Water Quality and Nutrient Monitoring Program for 2007 Looking After All Our Water Needs

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Avon River Catchment Water Quality and Nutrient Monitoring Program for 2007 Looking After All Our Water Needs Government of Western Australia Department of Water Avon River catchment Water Quality and Nutrient Monitoring Program for 2007 Looking after all our water needs March 2009 *RYHUQPHQWRI* :HVWHUQ$XVWUDOLD 'HSDUWPHQWRI' :DWHU Avon River catchment Water Quality and Nutrient Monitoring Program for 2007 Jointly funded by the Avon Catchment Council and the Western Australian and Australian governments through the National Action Plan for Salinity and Water Quality. AVON RIVERCARE PROJECT Department of Water March 2009 Department of Water 168 St Georges Terrace Perth Western Australia 6000 Telephone +61 8 6364 7600 Facsimile +61 8 6364 7601 www.water.wa.gov.au © Government of Western Australia 2009 March 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. ISBN 978-1-921508-91-2 (Print) ISBN 978-1-921508-92-9 (Online) Acknowledgements Charissa Marwick, Department of Water Northam, would like to acknowledge the Noongar people, traditional custodians of the Avon River catchment I would also like to thank the following people for their contributions to this publication: • Claire Hamersley and Rebekah Esszig, Department of Water Northam, for helping in the field and aiding in the day to day running of the water quality program. • Bern Kelly, Michael Allen and Martin Revell and Liz Western, Department of Water Swan Avon Region, for editorial comments and project support • Hydrological Technical Centre Staff, Department of Water Welshpool, for servicing, support and maintenance of all of the water quality monitoring equipment. • Staff of the Northam office of the Department of Water, for the fieldwork during the water quality snapshot. • Measurement and Water Information Branch, Department of Water Welshpool, for hydrographical information and fieldwork during the water quality snapshot. • Melanie Webb, Simon Hunter and Lin Ye Department of Water Perth, for the production of maps with water quality data. All photographs have been taken by Charissa Marwick unless otherwise stated. For more information about this report, contact Charissa Marwick, Natural Resource Management Officer – Avon Avon River catchment Water Quality Monitoring Avon River Monitoring Program report 2007 Contents Contents ...................................................................................................................... iii Abbreviations ...............................................................................................................ix Summary .....................................................................................................................xi 1 Introduction ............................................................................................................1 1.1 The Avon River catchment ...............................................................................1 1.2 Water quality ....................................................................................................4 1.3 Objectives ........................................................................................................5 2 Methodology ...........................................................................................................6 2.1 Sampling sites ...............................................................................................6 2.2 Sampling program and snapshot ...................................................................6 2.3 Data analysis and classification ...................................................................10 3 Results .................................................................................................................13 3.1 Comparison of Avon River monitoring sites .................................................13 3.2 Water quality site analysis for 2007 .............................................................20 3.3 Avon River Basin snapshot results ..............................................................99 4 Discussion ..........................................................................................................101 4.1 Fortnightly sampling ..................................................................................101 4.2 Avon River Basin water quality snapshot ..................................................115 5 Recommendations .............................................................................................117 Glossary ...................................................................................................................119 References ...............................................................................................................123 Maps 1 Avon River catchment ............................................................................................2 2 Monitoring sites for the 2007 water quality monitoring program ............................8 3 TN and TP for Avon River section of the 2006 Avon River snapshot. ................100 4 TN and TP for Avon River section of the 2007 Avon River snapshot. ................101 5 TN and TP for Yilgarn River section of the 2006 Avon River snapshot. .............102 6 TN and TP for Yilgarn River section of the 2007 Avon River snapshot. .............103 7 TN and TP for Lockhart River section of the 2006 Avon River snapshot ...........104 Department of Water iii Avon River Monitoring Program report 2007 Avon River catchment Water Quality Monitoring 8 TN and TP for Lockhart River section of the 2007 Avon River snapshot. ..........105 9 TDS results for the 2006 Avon River snapshot. .................................................107 10 TDS results for 2007 Avon River catchment water quality snapshot. ................108 11 The pH results for the 2006 Avon River catchment water quality snapshot. .......... 109 12 The pH results for the 2007 Avon River catchment water quality snapshot. .......... 110 Figures 1 Rainfall anomalies in Western Australia from 1 January to 31 December 2007 ....3 2 Total nitrogen concentrations for the 2007 monitoring program ...........................14 3 Total phosphorus concentrations for the 2007 monitoring program .....................15 4 Total dissolved salt concentrations for the 2007 monitoring program ..................16 5 Total suspended solids concentrations for the 2007 monitoring program ............17 6 pH readings for the 2007 monitoring program .....................................................18 7 Dissolved oxygen concentrations for the 2007 monitoring program ....................19 8 Swan River at Great Northern Highway during 2007 ...........................................21 9 Swan River at Walyunga during 2007 ..................................................................23 10 Wooroloo Brook at Karl’s Ranch during 2007 ......................................................25 11 Wooroloo Brook at Linley Valley Road during 2007 .............................................27 12 Werribee Creek at Hawke Avenue during 2007 ...................................................29 13 Werribee Creek at Coates Road during 2007 ......................................................31 14 Brockman River at Yalliawirra during 2007 ..........................................................33 15 Avon River at Stirling Terrace during 2007 ...........................................................35 16 Toodyay Brook at Toodyay West Road during 2007 ............................................37 17 Avon River at Katrine Bridge during 2007 ............................................................39 18 Avon River at the Downstream of Inflow sampling site during 2007 ....................41 19 Avon River at Clark Street during 2007 ................................................................43 20 Mortlock River at Taylor Street during 2007 .........................................................45 21 Mortlock River North at Frenches during 2007 ....................................................47 22 O’Driscoll’s Farm – Mortlock River – 615020 .......................................................49 23 Quellington Road – Mortlock River South – 6151028 ..........................................51 24 Mortlock River East at Great Eastern Highway during 2007 ................................53 25 Median water quality readings for Northam Weir – Avon River ............................55 26 Spencers Brook at Spencers Brook during 2007 .................................................57 27 Avon River at York Town Pool during 2007 ..........................................................59 iv Department of Water Avon River catchment Water Quality Monitoring Avon River Monitoring Program report 2007 28 Avon River at Balladong Street during 2007 ........................................................61 29 Mackie River at Top Beverley–York Road during 2007 ........................................63 30 Avon River at Gwambygine Pool during 2007 .....................................................65 31 Dale River at Waterhatch Bridge during 2007 ......................................................67 32 Avon River at Beverley Bridge during 2007 .........................................................69 33 Avon River South at the Downstream Brookton WWTP sampling site during
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