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The hydrological impact of the Parangana Dam on the Mersey River, Tasmania


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Knighton, AD 1988 , 'The hydrological impact of the Parangana Dam on the Mersey River, Tasmania' , Papers and Proceedings of the Royal Society of Tasmania, vol. 122, no. 2 , pp. 85-96 .

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By diverting the waters of the Merscy River into a neighbouring basin, the Parangana Darn changed the
hydrological character of the downstream river. The flow records of three gauging stations, located at J 0, 67 -and 88
km below the dam, provide the basis for identifying changes. Intermediate discharges have decreased the most and even
at the furthest downstream station are 50% lower than before. The flow extremes, at both ends of the scale, have been
less affected, and particularly the less frequent discharges which can be augmented by overspill. Indeed the highest
flood on record, with a recurrence interval of over 500 years, occurred in the post-dam period. One-day and lO day
minimum flows are markedly lower downstream of the dam, but below the Dasher, the main tributary of the Mersey,
they seem to recover and have almost regained pre-dam levels by the mouth. The entry of unregulated tributaries in
the middle section separates a much changed upstream hydrology from a doownstream one able to mitigate the worst
effects of the dam except at intermediate discharges. In the upstream part, the physical, chemical and biological
character of the river could be adversely affected by the altered flow regime, particularly in those reaches immediately
below the dam.

Item Type: Article
Authors/Creators:Knighton, AD
Keywords: Royal Society of Tasmania, RST, Van Diemens Land, natural history, science, ecology, taxonomy, botany, zoology, geology, geography, papers & proceedings, Australia, UTAS Library
Journal or Publication Title: Papers and Proceedings of the Royal Society of Tasmania
ISSN: 0080-4703
Collections: Royal Society Collection > Papers & Proceedings of the Royal Society of Tasmania
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Copyright Royal Society of Tasmania

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