1. Principal Researcher, Irrigation, International Water Management Institute, 12 km Multan Rd., Chowk Thokar Niaz Baig Rd., Lahore 53700, Pakistan (corresponding author).
2. Researcher, Hydrology/Water Management, International Water Management Institute, 12 km Multan Rd., Chowk Thokar Niaz Baig Rd., Lahore 53700, Pakistan.
3. Lecturer, Dept. of Civil and Natural Resources Engineering, Univ. of Canterbury, Private Bag 4800, Christchurch 8014, New Zealand.