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I' s r WRT 12 MAPPING AND CLASSIFICATION OF WETLANDS ,,=:-::~ :,. FROM AUGUSTA TO WALPOLE IN THE SOUTH WEST OF WESTERN AUSTRALIA WATER RESOURCE TECHNICAL SERIES WATER AND RlvERS COMMISSION REPORT WRT 12 < 1997 1~ l~[f1]11~~~1~~1\~il~ire 001205 WATER AND RIVERS COMMISSION WATER AND RIVERS COMMISSION HYATICiJN1RE 3 PLAIN S1REET EAST PERTH WESTERN AUSTRALIA 6004 TELEPHONE (08) 9278 0300 FACSIMILE (08) 9278 0301 Cover Photograph: The outstanding and natural basin and flat wetlands of the Scott Coastal Plain in the Scott National Park (looking north from Scott River Road). Photograph by Alan Hill, January 1997. ------------------ F ------------------ L_ u. I • L ; ',/I [ . '. ' .. '. MAPPING AND CLASSIFICATION OF WETLANDS FROM AUGUSTA TO WALPOLE IN THE SOUTH WEST OF-WESTERN AUSTRALIA Rep01t to the Water and Rivers Commission by the V. & C. Semeniuk Research Group Water and Rivers Commission Policy and Planning Division WATER AND RIVERS COMMISSION WATER REsoURCE TECHNICAL SERJES REPORT No WRT 12 - Acknowledgements This report to the Water and Rivers Commission presents For more information contact: three reports prepared by the V & C Semeniuk Research Water and Rivers Commission Group. Editing was completed by Andrew Del Marco, Policy and Planning Division Tanya Bosveld and Alan Hill. Thanks also to Gerry Hyatt Centre Mccourt, Kerryn Prosser and Nigel Alkinson for the 3 Plain S lreel preparation of maps and figures. EAST PERTH WA 6004 Telephone (08) 9278 0300 This report contributes to a series of documents published for the purposes of water allocation planning in the Busselton to Walpole Region. Other publications focus on the following topics: • An Investigation into the Aboriginal Significance of • Divertible Water Resource Inventory Wetlands and Rivers in the B ussellon-Walpole Region • An Investigation of a Hierarchical Approach to • Educational and Scientific Use ofWetlands and Rivers Describing Wetland Resources: The Bussellon in the Busselton-Walpole region Walpole Water Resource Region and the Lake Muir Lowland Wetland Region • Recreational Use of Water Bodies in the Busselton Walpole Region • A Description of the Hydrology of the Lake Muir Lowland Wetland Region and Implications for • A Systematic Overview of the Environmental Management Significance of Wellands, Rivers and Estuaries in the Busselton-Walpole Region Preliminary Allocation Discussion Paper and Review of Public Submissions • The distribution of freshwater fish in the south western corner of Western Australia • B ussel ton-Walpole Region Water Resources Allocation Plan • Historical Significance of Wetlands and Rivers in the Busselton-Walpole Region Reference Details The recommended reference for this publication is: V. & C. Semeniuk Research Group I 997, Mapping and Classification of Wetlands from Augusta to Walpole in the South West of Western Australia, Water and Rivers Commission, Water Resource Technical Series No WRT 12. ISBN 0-7309-7286-0 ISSN 1327-8436 Text printed on recycled stock, Onyx Bright White 100 gsm Australian made 100% recycled l!§J; Topkote Dull recycled 256 gsm -----------------------------<@ ----------------------------- 11 ~ Foreword The vision of the Water and Rivers Commission is to excel at water resource management by ensuring waters and rivers are used wisely by the community. The Commission has made a commitment to manage the water resources of Western Australia for the benefit of present and future generations in partnership with the community. The Commission is currently undertaking a series of floristics and fauna, between Augusta and Walpole studies aimed at developing a ~ater resources allocation provides information which should be used to protect strategy for the Busselton-Walpole Region. Allocation is wetland values and to support sustainable development to be based on the ecological, cultural and water supply in appropriate areas. values and needs of the community. Some of the work carried out on the coastal plain area of Currently, the Commission is working in the Busselton the Busselton-Walpole Region, between Bunbury and Walpole Region of the South West Drainage Division. It Dunsborough, has already been published as part of a is the second region covered and follows a study of the study on the wetlands of the Swan Coastal Plain (Hill et Perth-Bunbury Region carried out between 1985 and al 1996). 199 l. As part of the Busselton-Walpole work, consultants Together with the other reports, by the V & C Semeniuk V & C Semeniuk Research Group were engaged to map Research Group and others, being made available as part and classify wetlands in four selected parts of the Region. of the regional study, it is hoped that this report will This report presents the results of the wetland mapping encourage preservation, management and wise use of and classification work in three areas between Augusta wetlands and also inform community debate on how the and Walpole. It is being published to make publicly community may wish to more effectively protect and available the detailed wetland mapping and other new sustainably use the region's water resources. The information on wetland grouping which has resulted from Commission welcomes comments on this report from any these studies. interested person or organization. Mapping and classification of wetlands in the three areas between Augusta and Walpole has shown how extensive and interconnected the Region's wetland resources are. They include approximately 35% of total area mapped. M:::tzr The description of extent and type of the predominantly L_,2ector, Policy and Planning Division natural wetlands, valued for their biologically diverse .uater and Rivers Commission ---------=" ~ iii Contents Summary 1 3. The Meerup to Walpole area 27 3.1 Study area location 27 3.2 Regional setting 27 PART A: 3.2.1 Climate Setting and Wetland Types 27 Wetland Mapping and Classification 3 3.2.2 Geology and geomorphology 27 3.2.3 Hydrology 29 1. Wetland mapping and classification 3 3.3 Consanguineous wetland suites 33 1. 1 Introduction 3 3.4 Preliminary identification of outstanding 1.2 The Busselton-Walpole Region 3 wetlands 37 3.5 Summary 43 1.3 Wetland definition 3 1.4 An overview of wetland mapping, 4. The Muir-Unicup area 44 classification and evaluation 4 4.1 Study area and scope 44 1.5 Geomorphic classification of wetlands 4 4.2 Regional setting 44 4.2.1 Climate 44 1.6 Consanguinity and Consanguineous suites 5 4.2.2 Geology 44 1.7 Wetland evaluation and the preliminary 4.2.3 Geomorphology 45 identification of outstanding wetlands during 4.2.4 Hydrology 48 the mapping and classification process 5 4.2.5 Vegetation 48 4.3 Types of wetlands 48 1.8 Scope of this report 6 4.4 Consanguineous Wetland Suites 48 1.9 Wetland mapping and classification 6 4.4.1 Suites in the Muir-Unicup system 49 4.4.2 Suites in the Deep River System 51 1.10 Discussion 7 4.5 Preliminary identification of outstanding wetlands 52 PARTB: References Consanguineous Suites and 58 Preliminary Identification of Outstanding Wetlands 21 Appendices 61 Appendix A: 2. The Augusta to Donnelly River area 21 Wetland values (after Hill et al. 1996) 61 Appendix B: 2.1 Study area and scope 21 Descriptors of wetland landform, water and vegetation 2.2 The consanguineous suites of the Augusta 64 to Donnelly River area 21 Appendix C: Traverses and field sites used to assist 2.3 Correlation between described wetland determination of suites in the Meerup suites of the Augusta to Donnelly River to Walpole area 67 area and wetland suites of the Meerup to Walpole area 25 Appendix D: Botanical list of species in Table 6, covering 2.4 Preliminary identification of outstanding four wetland vegetation communities in the ·wetlands 25 Augusta to Donnelly River area 68 ~ iv Figures I. Geomorphic wetland mapping in the Busselton- 8. The modified geologic/geomorphic framework Walpole region and the location of the three of Wilde & Walker (1984) 28 study areas 2 9. Preliminary Description of Consanguineous 2. An example of Detailed Wetland Mapping 17 Wetland Suites in Domains throughout the Meerup to Walpole Area 31 3. Wetlands of the Augusta to Donnelly River Area 18 IO.Representative example of consanguineous 4. Wetlands of the Meerup to Walpole Area 19 wetland suites in the Meerup to Walpole area 32 II. Main Regional Geomorphic Units of the 5. Wetlands of the Muir-Unicup Area • 20 Muir-Unicup Area 47 6. Preliminary Description of the Consanguineous 12.Preliminary Description of Consanguineous Wetland Suites in Domains throughout the Wetland Suites in Domains throughout the Augusta to Donnelly River Area 22 Muir-Unicup Area 53 7. Representative example of consanguineous 13.Representative example of consanguineous wetland suites in the Augusta to Donnelly River wetland suites in the Muir-Unicup Area 54 area 23 Tables I. Wetland types defined within the global 5. Outstanding wetlands in the Augusta to Walpole geomorphic classification system. 4 and Muir-Unicup areas identified during wetland mapping and classification. 14 2. Criteria to identify natural wetland groups (Semeniuk 1988) 5 6. Composition of four wetland vegetation communities occurring in the Augusta to 3. Criteria used to identify wetland values 6 Donnelly River area 26 4. Preliminary list of wetland suites in the Augusta to Walpole and Muir-Unicup Areas identified during-wetland mapping and classification 8 __________________ ... g;; ------------------ V L_ ~ Summary The Water and Rivers Commission is currently working on the Busselton-Walpole Regional Allocation Study in order to guide current and future management of water resources for their effective protection and sustainable use. As part of the Busselton Walpole Study the V & C Semeniuk Research group were engaged as consultants to map and classify wetlands in three selected parts of the Region. This report presents three consultant reports to the Commission. The report is being published to make the detailed wetland mapping and classification, and other new information on wetland grouping, available to the public.