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Canning River Catchment Area Drinking Water Source Protection Plan Perth Integrated Water Supply Scheme

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Canning River Catchment Area Drinking Water Source Protection Plan Perth Integrated Water Supply Scheme Department of Water Government of Western Australia Canning River Catchment Area Drinking Water Source Protection Plan Integrated Water Supply System REPORT NO. 77 June 2007 �������������������������������� Canning River Catchment Area Drinking Water Source Protection Plan Perth Integrated Water Supply Scheme Department of Water Water Resource Protection Series Report 77 June 2007 Water Resource Protection Report 77 Canning River Catchment Area Drinking Water Source Protection Plan Department of Water Level 4, 168 St Georges Terrace Perth Western Australia 6000 <www.water.wa.gov.au > Telephone +61-8-6364 7600 Facsimile +61-8-6364 7601 For more information about this report, contact Program Manager Protection Planning, Water Source Protection Branch. June 2007 ISSN 1326-7442 Subject of cover photograph Canning Dam by Des Birt ii Department of Water Water Resource Protection Report 77 Canning River Catchment Area Drinking Water Source Protection Plan Contents Contents......................................................................................................................iii Tables ..........................................................................................................................................iv Preface........................................................................................................................ v Summary.....................................................................................................................vi 1 Drinking water supply system ................................................................................. 1 1.1 Existing water supply system ............................................................................................ 1 1.2 Water treatment ................................................................................................................. 1 1.3 Catchment details .............................................................................................................. 2 1.3.1 Physiography and Vegetation.................................................................................................2 1.3.2 Climate ...................................................................................................................................3 1.3.3 Hydrology ...............................................................................................................................3 1.4 Future water supply requirements..................................................................................... 4 1.5 Protection and allocation ................................................................................................... 4 1.5.1 Existing water source protection.............................................................................................4 1.5.2 Current allocation licence .......................................................................................................4 2 Water quality........................................................................................................... 7 2.1 Microbiological contaminants ............................................................................................ 7 2.2 Health related chemicals ................................................................................................... 8 2.3 Aesthetic characteristics.................................................................................................... 8 3 Land use and contamination risk ............................................................................ 9 3.1 Existing land uses.............................................................................................................. 9 3.1.1 Private land.............................................................................................................................9 3.1.2 Crown land .............................................................................................................................9 3.2 Proposed land uses......................................................................................................... 12 4 Catchment protection strategy .............................................................................. 14 4.1 Protection objectives........................................................................................................ 14 4.2 Proclaimed area............................................................................................................... 14 4.3 Priority classifications ...................................................................................................... 14 4.4 Protection zones .............................................................................................................. 15 4.5 Land use planning ........................................................................................................... 15 4.6 Best management practices ............................................................................................ 17 4.7 Surveillance and By-law enforcement ............................................................................. 18 4.8 Emergency response....................................................................................................... 18 4.9 Recommended protection strategies............................................................................... 19 5 Recommendations................................................................................................ 43 Appendices ............................................................................................................... 45 Glossary.................................................................................................................... 52 References................................................................................................................ 55 Contributors............................................................................................................... 57 Department of Water iii Water Resource Protection Report 77 Canning River Catchment Area Drinking Water Source Protection Plan Appendices Appendix A - Water Quality....................................................................................... 45 Appendix B - Photographs ........................................................................................ 48 Figures Figure 1. Canning River Catchment Area locality map.................................................5 Figure 2. Canning River Catchment Area, including Kangaroo Gully and Araluen sub- catchments...............................................................................................................6 Figure 3. Existing tenure in the Canning River Catchment Area ................................13 Figure 4. Proposed catchment boundary amendments, priority classifications and protection zones for the Canning River Catchment Area .......................................16 Tables Table 1 Land use, potential water quality risks and recommended strategies ...........20 Table 2 Aesthetic related detections for Canning Dam ..............................................46 Table 3 Health related detections for Canning Dam...................................................46 iv Department of Water Water Resource Protection Report 77 Canning River Catchment Area Drinking Water Source Protection Plan Preface The Department of Water has prepared this Drinking Water Source Protection Plan to report on activities and risks to water quality within the Canning catchment area and to recommend management strategies to minimise the identified risks. A safe drinking water supply is critical to the well-being of the community and catchment protection is necessary to help avoid, minimise or manage risks to water quality. The Department is committed to protecting drinking water sources to ensure the continued supply of ‘safe, good quality drinking water’ to consumers. The Australian Drinking Water Guidelines recommend a multiple barrier ‘catchment to consumer’ approach to protect public drinking water. The protection and management of drinking water catchments is the ‘first barrier’, with subsequent barriers implemented at the water storage, treatment and distribution stages of a water supply system. Catchment protection includes understanding the catchment, the hazards and hazardous events that can compromise drinking water quality, and developing and implementing preventive strategies and operational controls to ensure the safest possible raw water supply. This plan details the location and boundary of the Canning Reservoir catchment, which is used as a drinking water source for the Perth metropolitan drinking water supply. It discusses existing and future usage of the water source, describes the water supply system, identifies risks and recommends management approaches to maximise protection of the catchment. This plan should be used to guide State and local government land use planning decisions. It should be recognised in the relevant Town and Local Planning Schemes, consistent with the Western Australian Planning Commission’s Statement of Planning Policy No. 2.7 - Public Drinking Water Source Policy . Other stakeholders should use this document as a guide for protecting the quality of water in the Public Drinking Water Source Area. The stages involved in preparing a Drinking Water Source Protection Plan are: Stages in development of a Plan Comment 1 Prepare Drinking Water Source Assessment document prepared following Protection
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