Mulgrave River Management Action Plan.Pdf
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Mulgrave River Management Action Plan Document Control Summary Natural Resource Assessments Pty Ltd Job No: F:\AAA\228-Cairns River Improvement Trust\ 228002\Reports\MulgraveRiver_MAP_Final.R01.doc Status: Final Project Manager: Tim Anderson Title: Mulgrave River Management Action Plan Author/s: Dr Alexander Herr, Dr Jon Nott, Stuart Worboys, Marc Seifert, Alison Darroch, Anne Bolton, Tim Anderson. Client: Cairns River Improvement Trust Client Contact: Rob Lait Date of Issue: 24 May 2001 No. of Copies: 2 client, 1 master, 1 file/library Dispatched Via: Hand delivery Delivery Format: Hardcopy Other Info or Nil Requirements: Quality Assurance Approved for Issue Document Author Technical Review Editor by QA Manager Version Date Signature Dr Alexander Herr Tim Anderson Alison Darroch Final 24/5/01 PhD, Diplom (MSc MAgrSc MA BA equivalent) BAgrSc (Hons) Ross Kapitzke M NatRes BE (Hons) Table of Contents 1. Introduction ................................................................................................. 1 1.1 Background.............................................................................................2 2. Study Team................................................................................................... 3 3. The Mulgrave River Catchment ................................................................ 4 3.1 Vegetation...............................................................................................4 3.2 Soils.......................................................................................................8 3.3 Water Quality ..........................................................................................8 3.4 Conservation and Biodiversity....................................................................9 4. Approach.................................................................................................... 10 5. Identification of Issues (Stage 1) ............................................................ 12 5.1 Community Consultation.........................................................................12 5.2 Cultural Issues.......................................................................................15 6. Geomorphological Assessment (Stage 3).............................................. 17 7. Field studies (Stage 4) ............................................................................. 23 8. Mulgrave River Draft Management Action Plan (Stage 4) ................... 25 8.1 Reach Prioritisation................................................................................25 8.2 Results .................................................................................................26 9. Implementation.......................................................................................... 30 9.1 Strategies .............................................................................................30 9.2 Work Specific Recommendations............................................................32 10. Bibliography............................................................................................... 34 Figures Figure 1: Location of Reach Sections.........................................................................5 Figure 2: Five Year Running Mean of Maximum Monthly Instantaneous Flood Discharges on the Mulgrave River for the Years 1916 – 1999 ........................18 Tables Table 1: Summary of Issues as Identified from the Desktop Study and the Public Meeting of Stakeholders............................................................................14 Table 2: Summary Table of Issue Ratings as Determined by Field Assessment..........27 Table 3: Matrix of Reaches Ordered According to Four Prioritisation Rules.................29 Appendices Appendix 1: Theoretical Context for the Study Approach Appendix 2: Example Proforma Reach Assessment Sheets Appendix 3: Letter from EPA (Cultural Heritage) Appendix 4: Geomorphological Study of the Mulgrave River - Dr J. Nott Appendix 5: Reach Descriptions and Site-specific Sketches Appendix 6: Table of Plates Attachments Attachment 1: CD containing: Site-specific Photographs and EPBC Database Search Results Mulgrave River Management Action Plan 1. Introduction NRA was commissioned by the Cairns River Improvement Trust (CRIT) and the Mulgrave River Working Group (MRWG) to prepare the Mulgrave River Management Action Plan (MRMAP). The purpose of this work is to devise a management plan outlining priorities for site remediation works along the Mulgrave River. The study draws on recent information and research undertaken in the catchment, which identified: · areas in need of repair · actions to improve the river’s health · integrate resource use with ecological integrity of the catchment (NQ Joint Board 1998, RMCCC 1997), while also addressing community concerns. The approach taken in this study relies on expert knowledge, drawn from a multi-disciplinary team utilising existing information. A long-term scientific study could describe and quantitatively analyse changes in the river and identify causes, however, it is arguably not the most practical means of satisfying the goals of the Strategic Plan of the Russell and Mulgrave Rivers (RMCCC 1997) and the Mulgrave-Russell Catchment Rehabilitation Plan (NQ Joint Board 1998), which are specifically to develop an action plan for the Mulgrave River. The approach includes prioritisation of issues and sites for remediation, and relies on visual rapid assessment and incorporation of contemporary community perceptions. This study focuses on the Mulgrave River and its tributaries as outlined in the brief, however it is imperative that river rehabilitation takes into account the landscape perspective. In this report, where feasible, measures incorporating the wider landscape (ie more than the immediate area of the river with its channel and high banks) have been suggested. Such measures include provision of habitat connectivity and ecosystem functionality, which will in turn maintain sustainability of the landscape. The report provides a prioritisation matrix for site rehabilitation that maximises sustainable management of the Mulgrave River. It also provides a basis for funding submissions for future works and for monitoring and evaluation of remediation works. This report documents the stages of the project and includes descriptions of the: · biophysical setting · approach · identification of issues · a geomorphological assessment of the river · field studies · Mulgrave River Draft Management Action Plan · actions, priorities, and costs for implementation of works. Natural Resource Assessments Pty Ltd 1 24 May 2001 Mulgrave River Management Action Plan 1.1 Background There is a considerable amount of literature concerned with land use, and prevailing biophysical and ecological conditions in the Mulgrave catchment. Literature consulted for this study is referenced in the bibliography in Section 10 of this report. A brief chronological overview of key previous natural and cultural resources studies of the Mulgrave River catchment follows. · In the early 1980’s Cassells outlined land use priorities for the Mulgrave River including determination of conservation areas. One main area of concern was the loss of riparian vegetation along the Mulgrave River. · An agricultural study classified landforms and associated soils as to their suitability for sugar cane production in the Mulgrave area (Holz 1985). · An overview study summarising the biophysical environment, land use and cultural aspects of the Mulgrave and Russell catchments was conducted to provide a basis for land use planning (Connell Wagner 1992). This study, commissioned by the Water Resources Commission and the Mulgrave River Improvement Trust (MRIT), collated for the first time values, issues and conflicts as perceived by the community of the Mulgrave Catchment. · Following on from the above work the strategic plan for the Russell and Mulgrave rivers was developed, this identifies nine issues of concern. The three highest ranking issues are: - decreased water quality - decreased stream and riparian habitat values - loss of stream aesthetic and recreational values (RMCCC 1997). · In 1998 the NQ Joint Board prepared a report describing rehabilitation priorities for the Russell – Mulgrave Rivers (NQ Joint Board, 1998). Natural Resource Assessments Pty Ltd 2 24 May 2001 Mulgrave River Management Action Plan 2. Study Team A multi-disciplinary team lead by NRA was brought together to prepare the MRMAP. Members of the team and their fields of specialisation are listed below: · Tim Anderson (Project Director) – Catchment Management · Dr Jonathan Nott – Geomorphology · Ross Kapitzke – Environmental Engineering · Alan Dunne – River Engineering · Dr Alexander Herr– Terrestrial Ecology · Marc Seifert – Freshwater Ecology · Stuart Worboys – Riparian Vegetation · Anne Meiklejohn – Cultural Heritage · Ryan Beales – GIS. The technical team was assisted by a number of individual landholders and/or members of the Mulgrave River Working Group and Cairns River Improvement Trust. This assistance, which is gratefully acknowledged, was provided during the planning, field and reporting phases of the study and significantly contributed to the value of this final report. Natural Resource Assessments Pty Ltd 3 24 May 2001 Mulgrave River Management Action Plan 3. The Mulgrave River Catchment The Mulgrave River rises in the Lamb and Bellenden Ker Ranges and flows through a well- defined valley before crossing a narrow coastal