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Cataract Gorge: Environmental Flow Assessment


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Davies, PE ORCID: 0000-0003-2651-4061 and Cook, LSJ 2001 , Cataract Gorge: Environmental Flow Assessment.

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This aim of this project was to derive an environmental flow regime for the South Esk River in Cataract Gorge, i.e. downstream of Trevallyn Dam, in order to maintain and/or protect key aquatic ecosystem values within the Gorge.
Cataract Gorge is now a highly modified section of the South Esk River, with modified water quality and riparian conditions, and most significantly, the majority of its flows having been re-directed through the Trevallyn power station since the 1950's (Hydro 1999).
The existing flow regime is characterized by:

- a continuous low flow of 0.425 cumec released from the base of Trevallyn dam;

- short, frequently high-flow spill events which commence and end suddenly, typically occurring in winter and peaking at between 50 and 800 cumec.

The 0.425 cumec release is the dominant feature of the flow regime, occurring for 79% of all days during the last 10 years. Higher flows up to 30 cumec have accounted for only an additional 10% of that time.

Item Type: Report (Project Report)
Authors/Creators:Davies, PE and Cook, LSJ
Keywords: South Esk River, EF, environmental flows, Tasmania, low flow, Cataract Gorge
Publisher: Hydro Tasmania and Freshwater Systems
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