1. Grad. Student, Dept. of Hydr. and Hydr. Engrg., Sch. of Civ. Engrg., Cornell Univ., Ithaca, N. Y.; on leave from the Ministry of Irrig., Cairo, United Arab Republic
2. Asst. Prof., Dept. of Hydr. and Hydr. Engrg., Sch. of Civ. Engrg., Cornell Univ., Ithaca, N. Y.