1. Ph.D. Candidate, Dept. of Hydrology and Water Resources, Faculty of Water Sciences Engineering, Shahid Chamran Univ. of Ahvaz, 6135783135 Ahvaz, Iran (corresponding author).
2. Professor, Dept. of Hydrology and Water Resources, Faculty of Water Sciences Engineering, Shahid Chamran Univ. of Ahvaz, 6135783135 Ahvaz, Iran.
3. Assistant Professor, Dept. of Civil Engineering, Behbahan Khatam Alanbia Univ. of Technology, 63616 Behbahan, Iran.
4. Senior Researcher, Center for Natural Resources and Development, Institute for Technology and Resources Management in the Tropics and Subtropics (ITT), Technische Hochschule Köln, Betzdorferstr 2, 50679 Cologne (Deutz), Germany.