1. Professor of Water Resources, Dept. of Civil and Environmental Engineering, United Arab Emirates Univ., P.O. Box 17555, Al-Ain, United Arab Emirates.
2. Assistant Professor of Water Resources, Dept. of Civil and Environmental Engineering, United Arab Emirates Univ., P.O. Box 17555, Al-Ain, United Arab Emirates; and, Associate Professor of Water Resources, Dept. of Irrigation and Hydraulics, Faculty of Engineering, Cairo Univ., P.O. Box 12211, Giza, Egypt (corresponding author).
3. Hydrologist, Ministry of Environment and Water, P.O. Box 1509, Dubai, United Arab Emirates.
4. Director of Water Resources, Ministry of Environment and Water, P.O. Box 1509, Dubai, United Arab Emirates.