1. Assistant Professor, Dept. of Irrigation and Hydraulics Engineering, Ain Shams Univ., Cairo, Egypt; formerly, Postdoctoral Fellow, Dept. of Civil and Environmental Engineering, Univ. of South Carolina, Columbia, SC 29208.
2. Assistant Professor, Dept. of Irrigation and Hydraulics Engineering, Alexandria Univ., Alexandria, Egypt.
3. Adjunct Assistant Professor, Dept. of Civil and Environmental Engineering, Univ. of South Carolina, Columbia, SC 29208.
4. Mr. and Mrs. Irwin B. Kahn Professor and Associate Dean, International Program and Continuing Education, Dept. of Civil and Environmental Engineering, Univ. of South Carolina, Columbia, SC 29208 (corresponding author).