1. Post-Doctoral Research Associate, Agricultural and Biological Engineering Dept., Univ. of Florida, Rogers Hall, P.O. Box 110570, Gainesville, FL 32611.
2. Professor, Water Resources Engineering, Dept. of Biological and Agricultural Engineering, Dept. of Civil Engineering, Univ. of Idaho Research and Extension Center, 3793 N. 3600 E., Kimberly, ID 83341.
3. Distinguished Professor, Agricultural and Biological Engineering Dept., Univ. of Florida, Rogers Hall, P.O. Box 110570, Gainesville, FL 32611.