Submitted on: 12 November 2008.
Revised on: 13 January 2009.
Accepted on: 08 March 2009.
___________________JOURNAL OF HYDRAULIC RESEARCH---TAYLOR & FRANCIS LTD
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Submitted on: 14 July 2011.
Revised on: 27 October 2011.
Accepted on: 09 November 2011.
___________________JOURNAL OF HYDRAULIC RESEARCH---TAYLOR & FRANCIS LTD
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