1. Ph.D. Candidate, Irrigation and Reclamation Engineering Dept., Univ. of Tehran, Iran; and Visiting Researcher, UMR G-EAU, SupAgro, place Pierre Viala, 34060 Montpellier Cedex 1, France (corresponding author).
2. Professor, Irrigation and Reclamation Engineering Dept., Univ. of Tehran, P.O. Box 31587-4111, Karaj 31587-77871, Iran.