Too close for comfort : a fishway exit and a hydro-power station inlet

Stuart, Ivor G., Koehn, John D., O’Brien, Tim A., McKenzie, John A. and Quinn, Gerry P. 2010, Too close for comfort : a fishway exit and a hydro-power station inlet, Marine and freshwater research, vol. 61, no. 1, pp. 23-33, doi: 10.1071/MF08340.

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Title Too close for comfort : a fishway exit and a hydro-power station inlet
Author(s) Stuart, Ivor G.
Koehn, John D.
O’Brien, Tim A.
McKenzie, John A.
Quinn, Gerry P.ORCID iD for Quinn, Gerry P.
Journal name Marine and freshwater research
Volume number 61
Issue number 1
Start page 23
End page 33
Total pages 11
Publisher C S I R O Publishing
Place of publication Collingwood, Vic.
Publication date 2010
ISSN 1323-1650
Keyword(s) Australia
fish lock
Murray River
Summary A major environmental issue for hydro-electric power generation is passage of fish through turbines, or entrainment onto trash racks. At Yarrawonga Weir, on the upper Murray River in south-eastern Australia, the positioning of a fish lock resulted in the potential for upstream migrating fish to be swept back into the adjacent power station by cross flows. In 2004, a 4.5-m long steel extension flume was attached to the exit to alleviate this problem. To determine the fate of native fish after exiting the extension flume, 72 individuals (305–1015 mm long) were implanted with radio-transmitters and released into the fish lock exit channel. In 2004 (power station inflows 10 300 ML day–1), the majority of fish exited successfully (44 of 45) and only a single fish (2%) was entrained into the power station. In 2005 (power station inflows 12 000 ML day–1), fish again exited successfully (26 of 27) but with a higher proportion entrained (5 of 27; 18%). This reduced success appeared to be related to strong transverse flows with high water velocities adjacent to the fish lock exit. The efficiency of fish passage at this site might be improved by altering water management strategies, integrating engineering and fish biology, and through field-testing of proposed solutions
Language eng
DOI 10.1071/MF08340
Field of Research 060204 Freshwater Ecology
Socio Economic Objective 960506 Ecosystem Assessment and Management of Fresh, Ground and Surface Water Environments
HERDC Research category C1 Refereed article in a scholarly journal
HERDC collection year 2010
Copyright notice ©2010, CSIRO
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