1. Professor, Agricultural Engineering Dept., and Supervisor, Alamoudi Water Chair, King Saud Univ., P.O. Box 2460, Riyadh, Saudi Arabia 11451 (corresponding author).
2. Lecturer, Agricultural Engineering Dept., King Saud Univ., P.O. Box 2460, Riyadh, Saudi Arabia 11451; and Researcher, Agriculture Engineering Research Institute, Agriculture Research Center, P.O. Box 256, Cairo, Egypt.
3. Assistant Professor, Alamoudi Water Chair, King Saud Univ., P.O. Box 2460, Riyadh, Saudi Arabia 11451.