Wetland Inventory and Management for the Myimbarr and Shell Cove Wetlands, Shellharbour
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University of Wollongong Research Online Faculty of Science, Medicine & Health - Honours Theses University of Wollongong Thesis Collections 2012 Wetland Inventory and Management for the Myimbarr and Shell Cove Wetlands, Shellharbour Madeleine Harper University of Wollongong Follow this and additional works at: https://ro.uow.edu.au/thsci University of Wollongong Copyright Warning You may print or download ONE copy of this document for the purpose of your own research or study. The University does not authorise you to copy, communicate or otherwise make available electronically to any other person any copyright material contained on this site. You are reminded of the following: This work is copyright. Apart from any use permitted under the Copyright Act 1968, no part of this work may be reproduced by any process, nor may any other exclusive right be exercised, without the permission of the author. 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Recommended Citation Harper, Madeleine, Wetland Inventory and Management for the Myimbarr and Shell Cove Wetlands, Shellharbour, Bachelor of Environmental Science (Honours), School of Earth & Environmental Science, University of Wollongong, 2012. https://ro.uow.edu.au/thsci/41 Research Online is the open access institutional repository for the University of Wollongong. For further information contact the UOW Library: [email protected] Wetland Inventory and Management for the Myimbarr and Shell Cove Wetlands, Shellharbour Abstract The study of two constructed wetland systems in Shellharbour was undertaken to create an inventory of the various components constituting the wetlands. This inventory was then used to determine the wetlands functionality in regards to their intended purpose and design, and create a series of management recommendations for submission to Shellharbour City Council. The constructed wetlands were designed to provide stormwater detention and treatment to the recently developed residential catchments within the Shellharbour Local Government Area, and provide compensatory habitat for local fauna and flora. Water, soil and vegetation analyses were undertaken to examine the wetlands. Water quality testing at Myimbarr/Tongarra Creek system revealed that water quality improves and becomes stabilised as it moves through the catchment, indicating the efficiency of the wetlands in eatingtr stormwater runoff. Results obtained at Shell Cove sites indicated that water quality was good and conditions are quite consistent throughout the Shell Cove catchment, however as the ponds are disconnected from one another results are not indicative of patterns occurring on a system-wide scale. Soil types determined within the wetlands included silty clay, silty clay loam, silty loam and sand. Soil pollution was not identified at the Myimbarr/Tongarra Creek sites, however elevated readings of Cu, Zn and Pb obtained at one Shell Cove site indicate small-scale pollution may be present. Vegetation surveys showed that introduced species were problematic throughout both wetlands systems, as were dominant native species. It was determined that the wetlands were achieving their intended purpose in providing stormwater treatment and habitat, however areas for improvement were identified. Management should target water quality, sedimentation, vegetation and catchment practices to maintain the health and functionality of the constructed wetland systems and prevent future degradation. Degree Type Thesis Degree Name Bachelor of Environmental Science (Honours) Department School of Earth & Environmental Science Advisor(s) Brian Jones Keywords Constructed wetlands, water quality, vegetation management, soil quality This thesis is available at Research Online: https://ro.uow.edu.au/thsci/41 Wetland Inventory and Management for the Myimbarr and Shell Cove Wetlands, Shellharbour by Madeleine Harper A research report submitted in partial fulfilment of the requirements for the award of the degree of HONOURS BACHELOR OF ENVIRONMENTAL SCIENCE Faculty of Science University of Wollongong October 2012 ii The information in this thesis is entirely the result of investigations conducted by the author, unless otherwise acknowledged, and has not been submitted in part, or otherwise, for any other degree or qualification. Madeleine Harper iii Acknowledgements I would like to thank a number of people who have assisted me in completing this thesis. Firstly my supervisors, Brian Jones and Tuesday Heather: your help, guidance and advice over the course of the year were invaluable and greatly appreciated. Thank you to the staff at Shellharbour City Council, in particular Andrew Williams for his assistance with water quality and sampling; Andrew Lee for sharing his plethora of knowledge of plant species, and for helping me identify the many samples I arrived at the council with; and Sharyn Langford for her assistance in creating my maps. I would like to thank Jose Abrantes for his assistance in the preparation and analysis of my soil samples. Finally my friends and family, I could not have got through it without you. Thank you to my friends for your sympathy and support, and for not tiring of my endless thesis-talk. A special thanks to my uni friends, this year would have been much harder without having someone to share the good and bad times, and have a laugh with. Thank you to my dad, for your tireless efforts assisting with my fieldwork. Thank you for carrying my equipment and offering advice with (almost) no complaints. Thank you to my mum for listening to my endless rants on the phone and providing plenty of home-cooked meals when I needed them. Thank you to my sisters who provided support, lollies and chocolate when they were needed most, and to Sinead for putting up with me as a housemate throughout the year. iv Abstract The study of two constructed wetland systems in Shellharbour was undertaken to create an inventory of the various components constituting the wetlands. This inventory was then used to determine the wetlands functionality in regards to their intended purpose and design, and create a series of management recommendations for submission to Shellharbour City Council. The constructed wetlands were designed to provide stormwater detention and treatment to the recently developed residential catchments within the Shellharbour Local Government Area, and provide compensatory habitat for local fauna and flora. Water, soil and vegetation analyses were undertaken to examine the wetlands. Water quality testing at Myimbarr/Tongarra Creek system revealed that water quality improves and becomes stabilised as it moves through the catchment, indicating the efficiency of the wetlands in treating stormwater runoff. Results obtained at Shell Cove sites indicated that water quality was good and conditions are quite consistent throughout the Shell Cove catchment, however as the ponds are disconnected from one another results are not indicative of patterns occurring on a system-wide scale. Soil types determined within the wetlands included silty clay, silty clay loam, silty loam and sand. Soil pollution was not identified at the Myimbarr/Tongarra Creek sites, however elevated readings of Cu, Zn and Pb obtained at one Shell Cove site indicate small-scale pollution may be present. Vegetation surveys showed that introduced species were problematic throughout both wetlands systems, as were dominant native species. It was determined that the wetlands were achieving their intended purpose in providing stormwater treatment and habitat, however areas for improvement were identified. Management should target water quality, sedimentation, vegetation and catchment practices to maintain the health and functionality of the constructed wetland systems and prevent future degradation. v Contents Acknowledgements .................................................................................................................. iii Abstract ..................................................................................................................................... iv List of Figures ........................................................................................................................... ix List of Tables ........................................................................................................................... xii List of Appendices ................................................................................................................. xiii Chapter One ............................................................................................................................... 1 1.1 Introduction ...................................................................................................................... 1 1.2 Study Context ................................................................................................................... 1 1.2.1 Myimbarr Wetlands ..................................................................................................