1. Assoc. Prof., St. Anthony Falls Hydraulic Lab., Univ. of Minnesota, Minneapolis, Minn. 55414
2. Prof., Dept. of Civ. Engrg., Oregon State Univ., Corvallis, Oreg.
3. Research Officer, Western Canada Hydr. Lab., 1186 Pipeline Rd., Port Coquitham, B.C., Canada