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Submitted on: 21 September 2004.
Revised on: 25 November 2004.
Accepted on: 12 December 2004.
___________________Journal of Hydrology---ELSEVIER
Submitted on: 13 January 2000.
Revised on: 29 April 2000.
Accepted on: 02 June 2000.
___________________Journal of Hydrology---ELSEVIER
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Submitted on: 14 November 2002.
Revised on: 26 December 2002.
Accepted on: 16 February 2003.
___________________Journal of Hydrology---ELSEVIER
Submitted on: 26 January 2002.
Revised on: 18 February 2002.
Accepted on: 16 March 2002.
___________________Journal of Hydrology---ELSEVIER