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- W778848960 abstract "Many reservoirs throughout the world are approaching the end of their operational life and no longer fulfil their original purpose. The cost to maintain these structures, coupled with increasing societal concern about the environmental impacts associated with reservoirs, has raised questions as to how these reservoirs should be managed in the future. The purpose of the dissertation was to evaluate management strategies for ageing, post-water supply infrastructure to deliver improved environmental outcomes, based on modifications to environmental water releases.The dissertation initially undertook a review of the available literature, analysing the current management options and legislation relating to ageing, post-water supply infrastructure in Australia. To provide context to the study, literature was also examined on the environmental impacts of reservoirs and methods to determine environmental water requirements. Management options to deliver improved environmental outcomes were then analysed based on the case study of the Gold Creek Reservoir (GCR), constructed in 1885, near Brookfield, in South East Queensland.The literature review identified that modification to reservoir operations was one of the only management options to manage ageing, post-water supply reservoirs, especially where removal or partial removal was not an option, which was applicable to the GCR. Legislation relating to the sustainable management of reservoirs and water resources has developed over the past 20 years. However, the management of smaller, ageing reservoirs is largely ignored under this legislation, especially in Queensland.The FLOWS method was selected to undertake an environmental flow assessment to identify environmental assets in Gold Creek and determine the impacts of flow regulation on these assets. Environmental flow objectives to maintain or enhance identified environmental assets were developed based on the natural flow paradigm. Hydrological modelling and ecological assessments were undertaken in both the regulated Gold Creek and the unregulated Moggill Creek in the adjacent catchment. The ability of environmental flow assessments to deliver environmental releases from ageing, post-water supply reservoirs to maintain or enhance environmental objectives was then evaluated based on the comparison of results between catchments and the hydrological modelling outcomes.The environmental flow assessment of Gold Creek and Moggill Creek identified that the catchments have a significant number of important environmental assets, including 11 species of native fish, 52 macroinvertebrate families and a viable platypus population. The area also has relatively good water quality, channel stability and habitat condition. The analysis of hydrological modelling outputs revealed that the GCR has impacted on the natural flow regime of Gold Creek. Total annual flows have been reduced in reaches of Gold Creek by up to 71% and the reservoir has also decreased the frequency and magnitude of flood events. The current environmental releases from the reservoir have also resulted in unnaturally higher flows in Gold Creek, especially during the low flow season (June to November), which has prevented the occurrence of natural zero flow periods. Overall, current ecological health was concluded to be superior in Gold Creek than the unregulated Moggill Creek, despite the impacts of the GCR on the natural flow regime. The current study only provided a snapshot of ecosystem condition, following a season with higher than average rainfall. However, there is evidence that if key natural flow events are not provided by environmental water releases that there is a substantial risk of ecosystem decline. Consequently, the dissertation highlighted the need for modification to current environmental releases from the GCR to maintain ecosystem health.Environmental flow recommendations were developed for regulated reaches of Gold Creek to maintain and enhance identified environmental assets based on published literature, expert opinion and previous environmental flow assessments. The study revealed that there was significant potential to modify environmental releases from the reservoir to deliver environmental objectives. However, there was a high degree of uncertainty associated with the environmental flow recommendations prescribed, because of the lack of long term monitoring and flow data on the Gold Creek catchment. The research also highlighted that the restoration of the natural flow regime may not necessarily improve waterway health, due to non-flow related catchment scale impacts, including urban and farming land uses.The dissertation recommended that an adaptive management approach, based on long term ecological and hydrological modelling, was essential to guide the development of more quantitative environmental flow recommendations for the Gold Creek Reservoir. The dissertation also revealed that there is also a need to continue to provide environmental releases from reservoirs to minimise the risk of ecosystem health decline. Furthermore, the study also recognised that ongoing ecological monitoring by community catchment groups, coupled with improved collaboration between key stakeholders, offers tremendous opportunities to successfully implement an adaptive management framework to deliver environmental flow releases from ageing, post-water supply reservoirs. There are also potential opportunities to utilise conservation outcomes delivered through the adaptive management of environmental releases from these reservoirs for financial benefit, through biodiversity offsets.Overall, the dissertation successfully established that the management of environmental water releases from ageing, post-water supply infrastructure provides opportunities to deliver improved environmental outcomes in regulated waterways. However, the case study of the GCR highlighted that the definition of environmental flow recommendations to deliver measurable environmental benefits is an incredibly complex and multi-faceted problem, which can only be successfully addressed through the continued monitoring and adaptive management of environmental water releases." @default.
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- W778848960 date "2011-01-01" @default.
- W778848960 modified "2023-09-27" @default.
- W778848960 title "Management of ageing, post-water supply reservoirs to deliver enhanced environmental outcomes : a case study of the Gold Creek Reservoir, South East Queensland." @default.
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