1. Professor of Hydrology, Charles Sturt Univ., Program Leader, Cooperative Research Centre for Irrigation Futures, and Senior Principal Scientist, CSIRO Land and Water. Locked Bag 588, Wagga Wagga, NSW 2678, Australia. E-mail: skhan@csu.edu.au
2. Research Associate—Hydrology, Charles Sturt Univ., and Project Leader, Cooperative Research Centre for Irrigation Futures, Locked Bag 588, Wagga Wagga, NSW 2678, Australia. E-mail: aahmad@csu.edu.au
3. Hydrologist, CSIRO Land and Water, Griffith Laboratory, Griffith, NSW 2680, Australia. E-mail: butian.wang@csiro.au