1. Assistant Professor, Dept. of Civil Engineering, Univ. of Qom, Qom, Iran; formerly, Dept. of Irrigation and Reclamation, Faculty of Agricultural Engineering and Technology, College of Agriculture and Natural Resources, Univ. of Tehran, Karaj, 3158777871 Tehran, Iran.
2. Professor, Dept. of Irrigation and Reclamation, Faculty of Agricultural Engineering and Technology, College of Agriculture and Natural Resources, Univ. of Tehran, Karaj, 3158777871 Tehran, Iran (corresponding author).
3. Distinguished Professor Emeritus, Dept. of Land, Air and Water Resources, Dept. of Civil and Environmental Engineering, Dept. of Biological and Agricultural Engineering, Univ. of California, 139 Veihmeyer Hall, Davis, CA 95616-8628.