1. Research Agric. Engr., U.S. Water Conservation Lab., Soil and Water Conservation Research Div., Agric. Research Service, U.S. Dept. of Agric., Tempe, Ariz.; formerly Instructor, Dept. of Agric. Engrg., Univ. of Illinois, Urbana, Ill.
2. Prof. of Hydr. Engrg., Univ. of Illinois, Urbana