1. Agricultural Engineer, Conservation and Production Research Laboratory, U.S. Dept. of Agriculture/Agricultural Research Service, P.O. Drawer 10, Bushland, TX 79012.
2. Agricultural Engineer, U.S. Water Conservation Lab., U.S. Dept. of Agriculture/Agricultural Research Service, 4331 East Broadway, Phoenix, AZ 85040.
3. Physical Scientifist, U.S. Water Conservation Lab., U.S. Dept. of Agriculture/Agricultural Research Service, 4331 East Broadway, Phoenix, AZ 85040.
4. Associate Professor, Dept. of Agricultural and Biosystems Engineering, Univ. of Arizona, Tucson, AZ 85721.
5. Research Associate, Dept. of Agricultural and Biosystems Engineering, Univ. of Arizona, Tucson, AZ 85721.
6. Research Associate and Graduate Student, Dept. of Agricultural and Biosystems Engineering, Univ. of Arizona, Tucson, AZ 85721.