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Foreshore Condition Survey and Management Recommendations for Collier River and Butler's Creek

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Foreshore Condition Survey and Management Recommendations for Collier River and Butler's Creek Foreshore condition survey and management recommendations for Collier River and Butler’s Creek Department of Water February 2009 Looking after all our water needs 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 February 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 978-1-921549-47-2 (online) Acknowledgements The Department of Water would like to thank the following for their contribution to this river action plan: • Kirsten Murray for undertaking the fieldwork and preparing the plan • the Shire of Manjimup and Department of Environment and Conservation (Frankland District) for providing information to help with the plan’s development • Rae Warr for assisting with fieldwork • landholders for providing access to the waterways. This project has been funded by South Coast Natural Resource Management Inc. through the Natural Heritage Trust and National Action Plan for Salinity and Water Quality, both of which are supported by the Australian and Western Australian governments. For more information about this report, contact: Rivercare Officer South Coast Region 5 Bevan Street Albany WA 6330 Contents Contents ......................................................................................................................iii Summary .....................................................................................................................iv 1 Introduction.............................................................................................................. 1 2 Aim of the study....................................................................................................... 2 3 The catchments ....................................................................................................... 3 3.1 Study area ......................................................................................................................... 3 3.2 Hydrology .......................................................................................................................... 4 3.3 Land use............................................................................................................................ 4 3.4 Rare and declared flora and fauna.................................................................................... 5 3.5 Aboriginal significance....................................................................................................... 5 4 Methods................................................................................................................... 6 5 Results..................................................................................................................... 7 5.1 Foreshore condition........................................................................................................... 7 5.2 Water quality ..................................................................................................................... 8 6 Management recommendations ............................................................................ 10 6.1 Riparian zone .................................................................................................................. 10 6.2 Fire .................................................................................................................................. 10 6.3 Erosion ............................................................................................................................ 10 6.4 Dams ............................................................................................................................... 11 6.5 Weeds ............................................................................................................................. 12 7 Conclusion............................................................................................................. 13 Appendices ................................................................................................................ 14 References ................................................................................................................ 36 Appendices Appendix 1.— Foreshore assessment of Collier River and Butler’s Creek ............... 14 Appendix 2.— Total foreshore condition of Collier River and Butler’s Creek ............ 32 Appendix 3.— Recommended plant species for revegetation in the Collier River and Butler’s Creek catchments..................................................................................... 32 Appendix 4.— Weed species of Collier River and Butler’s Creek catchments .......... 33 Appendix 5.— Foreshore condition form ................................................................... 33 Department of Water iii Collier Butler river action plan Summary The Collier River and Butler’s Creek are located directly north and north-east of Walpole on Western Australia’s South Coast. Both systems flow into the Walpole Inlet, which has been proposed as a Marine Conservation Class A reserve. Preserving the high ecological and social values of the Walpole and Nornalup inlets relies on maintaining the health of the water bodies that feed them. The endangered Engaewa walpolea (Walpole freshwater burrowing crayfish) and the declared-rare Reedia spathacea (reedia), along with the priority-listed Setonix brachyurus (quokka), Isoodon obesulus (quenda) and Pleurophascum occidentale (western giant-leaved moss) have been located, or are thought to exist, within the catchment’s boundaries. Each of these species relies heavily on the health of the waterways and surrounding riparian zone. The Collier River is in very good health with approximately 75 per cent of the riparian vegetation along the river considered to be in A-grade condition. In the lower reaches of Butler’s Creek the riparian vegetation is in excellent condition, while 64 per cent of the riparian vegetation in the whole catchment is considered to be A-grade. The catchment’s hydrology has been altered through construction of more than 22 on-stream dams within the catchment. In winter the dams only absorb small flow amounts and allow them to pass through; however, in summer/autumn they take a much greater proportion of the flows, therefore causing a perennial system to become ephemeral. Moderate levels of nitrogen and low levels of phosphorous have been recorded in the water flowing from the Collier River into the Walpole Inlet. Both nutrient levels were below the Australian and New Zealand Environment Conservation Council (2000) guidelines for a lowland river in south-western Australia. Management recommendations for the catchment include fencing creek lines to exclude stock, weed control and widening the riparian buffer. The Department of Water has made funding available to help landholders implement these recommendations. Across the catchment photo points have been selected which represent the catchment’s current health and will allow ongoing monitoring. iv Department of Water 1 Introduction The Walpole and Nornalup inlets have been widely recognised as having high ecological and social values. They have also been documented as biologically diverse compared with most estuarine systems in south-west Western Australia: the inlets and the tidal reaches of the Frankland, Deep and Walpole rivers have been proposed as a Marine Conservation Class A reserve. Maintaining the integrity of this highly valued ecosystem requires a better understanding of the greater catchment and the waterways that discharge into the inlets. The condition of the Frankland, Deep, Junior and Walpole rivers, as well as their impact on the inlets, has been documented. However, those waterways in close proximity to the inlets, such as the Collier River and Butler’s Creek, are the last remaining waterways to be assessed. Department of Water 1 Collier Butler river action plan 2 Aim of the study This report’s focus is to determine the general condition of the Collier River and Butler’s Creek, and in doing so, identify any potential impacts of the catchment on the Walpole and Nornalup inlets. Specifically, the report will: • assess the condition of the riparian vegetation on private land • assess the bank and stream degradation in areas of cleared land • gain an understanding of the water quality in the catchments • provide a preliminary series of recommendations for rehabilitation work along the foreshore. The foreshore survey has been restricted to areas of private land, as the remaining part of the catchment is within a National Park and is presumed to be in pristine condition. The survey and the resulting recommendations are intended to provide direction and advice to landholders and managers. 2 Department of Water 3 The catchments 3.1 Study area The town of Walpole is located on Western Australia’s South Coast approximately 110 km west of Albany on the South Coast Highway. The catchments of Collier River and Butler’s Creek are located directly north and north-east of Walpole (Figure 1). The Collier River is further to the east and has a catchment area of 834 ha, with 30.7 km of
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