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River Clyde Environmental Flow Assessment

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Davies, PE and Cook, LSJ and Koehnken, L (2005) River Clyde Environmental Flow Assessment. Project Report. DPIWE, Water Management Branch, Hobart.

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Abstract

The River Clyde flows from the outlet of Lake Crescent in the Central Highlands, via the
townships of Bothwell and Hamilton, to the Derwent River. The catchment has
experienced extensive clearing, especially in its middle and lower sections, and is subject
to varying intensity of landuse. Grazing production is supplemented by irrigation,
frequently involving flood irrigation of pasture, and water management is seen as a
critical aspect of agricultural production in a catchment which frequently experiences
very dry summers. As a consequence, water management, particularly with regard to
storage and releases from the Lake Sorell-Crescent system, has been in place since the
mid-1800s and has been intensive for over 50 years. The magnitude and seasonal pattern
of baseflows (flows between major flood events) in the Clyde are largely dictated by
managed lake releases and downstream abstractions during the majority of the year.
An environmental flow assessment was conducted for the River Clyde during the
development of the River Clyde Water Management Plan (DPIWE 2004). This document
summarises the work conducted and the main results. The study was conducted
iteratively while both the River Clyde and the Lakes Sorell and Crescent WMPs were
being developed, due to the need for integration of the environmental water requirement
assessment for the river with that of the Lake Sorell and Clyde system, in its headwaters.
The final result was therefore a trade-off between water management implications for the
lake and river environments.

Item Type: Report (Project Report)
Keywords: Clyde River, Tasmania, environmental flows, Lake Sorell, Lake Crescent
Publisher: DPIWE, Water Management Branch
Date Deposited: 10 Jan 2007
Last Modified: 18 Nov 2014 03:12
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