Foreshore and Channel Assessment of the Toodyay Brook
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FORESHORE AND CHANNEL ASSESSMENT GOVERNMENT OF WESTERN AUSTRALIA OF THE TOODYAY BROOK WATER RESOURCE MANAGEMENT SERIES WATER AND RIVERS COMMISSION REPORT WRM 22 2001 WRATER AND IVERS COMMISSION WATER AND RIVERS COMMISSION HYATT CENTRE 3 PLAIN STREET EAST PERTH WESTERN AUSTRALIA 6004 TELEPHONE (08) 9278 0300 FACSIMILE (08) 9278 0301 WEBSITE: http://www.wrc.wa.gov.au We welcome your feedback: A publication feedback form is enclosed with this publication and can be found online at http://www.wrc.wa.gov.au/public/feedback Cover photograph: Toodyay Brook showing channel condition [Taken by Patricia Janssen] FORESHORE AND CHANNEL ASSESSMENT OF THE TOODYAY BROOK Water and Rivers Commission Avon River Management Authority Natural Heritage Trust WATER AND RIVERS COMMISSION REPORT NO WRM 22 FEBRUARY 2001 i Acknowledgments This report was prepared by Patricia Janssen who Martin Revell, Water and Rivers Commission, for acknowledges the funding provided by the Natural Heritage project support and assistance; Trust for the project and the assistance and support from Brendan Oversby, Water and Rivers Commission, for the following people: assistance with plant identification; Landholders along Toodyay Brook for their valuable Stephanie Cobb, Water and Rivers Commission, for information about the Brook and help with field assistance with water quality monitoring; surveys; Jonelle Black, Water and Rivers Commission, for Margaret Thorpe, Shire of Toodyay, for assistance with assistance with field surveys and report editing; landholder contact details; Catherine Walker, Water and Rivers Commission, for Gerry McCourt, Water and Rivers Commission, for assistance with field surveys; and map production; Lucy Sands and Kerry Trayler, Water and Rivers Avril Howcroft, AgWest, for map production; Commission, for report editing. Doris and Ray Martin, for information regarding the history of the Toodyay Valley region; Photographs were taken by Patricia Janssen. Reference Details The recommended reference for this publication is: Water and Rivers Commission 2001, Foreshore and Channel assessment of the Toodyay Brook,Water and Rivers Commission, Water Resource Management Series, No WRM 22. ISBN 0-7309-7518-5 ISSN 1326-6934 Text printed on recycled stock February, 2001 ii Preface This channel and foreshore assessment is a joint project consultation, with attempts made to involve landholders between the Natural Heritage Trust, Water and Rivers along the Brook in as many aspects as possible. Commission and the Avon River Management Authority. As part of the Avon Rivercare Program this survey is part A management survey of the Toodyay Brook channel and of a larger project to undertake the management surveys foreshore has now been completed. It is hoped that this of major tributaries feeding into the Avon River. Foreshore information will lead to the planning of a program of and channel assessments along Toodyay Brook were management actions that can be easily undertaken by undertaken between March and June 2000. landholders and community groups from the areas surrounding the Brook. The aim of this project is to document the current condition This report describes the current condition of both the and management needs of the Toodyay Brook, through channel and foreshore along the Toodyay Brook, focusing consistent field surveys, in consultation with adjacent on surrounding landuse, current disturbances and landholders. An emphasis of this project is community management practices that are already in place. A healthy catchment is one that can recover from perturbations. It is economically viable and environmentally self-sustaining. Plate 1. Foreshore condition along Toodyay Brook iii Live as if you die tomorrow Farm as if you live forever Old English proverb iv Contents Summary ................................................................................................................... 1 Introduction .............................................................................................................. 3 Purpose of the survey ........................................................................................................................................... 3 Historical description of the Toodyay Brook........................................................................................................ 3 Aboriginal heritage ..................................................................................................................................... 3 European heritage ....................................................................................................................................... 3 Catchment description .......................................................................................................................................... 5 Population .................................................................................................................................................. 5 Location ...................................................................................................................................................... 5 Climate ....................................................................................................................................................... 5 Geomorphology and soils ........................................................................................................................... 6 Hydrology - Floods .................................................................................................................................... 6 Vegetation................................................................................................................................................... 6 Catchment landuse and tenure .................................................................................................................... 6 Survey methods ...................................................................................................... 10 Community involvement..................................................................................................................................... 10 Assessment technique ......................................................................................................................................... 10 Method of analysis.............................................................................................................................................. 10 Survey results ......................................................................................................... 13 Channel stability ................................................................................................................................................. 13 Bank and bed stability .............................................................................................................................. 13 Waterways features ............................................................................................................................................. 15 Foreshore condition ............................................................................................................................................ 16 General foreshore condition ..................................................................................................................... 16 Best foreshore condition ........................................................................................................................... 16 Poorest foreshore condition ...................................................................................................................... 16 Foreshore vegetation .......................................................................................................................................... 18 Presence of common species .................................................................................................................... 18 Proportion of native species ..................................................................................................................... 18 Regeneration of native species ................................................................................................................. 18 Death of common native species .............................................................................................................. 18 v Vegetation cover ....................................................................................................................................... 20 Weeds ..................................................................................................................................................... 22 Pest plants ................................................................................................................................................. 22 Declared plants ......................................................................................................................................... 23 Habitat diversity ................................................................................................................................................ 23 Fencing status ..................................................................................................................................................... 24 Water quality......................................................................................................................................................