1. Lecturer, Dept. of Civil and Natural Resources Engineering, Univ. of Canterbury, Private Bag 4800, Christchurch 8140, New Zealand (corresponding author).
2. Principal Researcher, Irrigation, International Water Management Institute, 12 km Multan Rd., Chowk Thokar Niaz Baig Rd., Lahore 53700, Pakistan.
3. Researcher, Water Management and Hydrology, International Water Management Institute, 12 km Multan Rd., Chowk Thokar Niaz Baig Rd., Lahore 53700, Pakistan.