1. Assistant Professor, Dept. of Civil Engineering, Univ. of Idaho, Moscow, ID 83844-1022.
2. Research Hydraulic Engineer, Agricultural Research Service, U.S. Dept. of Agriculture, Crops Research Laboratory, 1701 Center Ave., Fort Collins, CO 80526.
3. Associate Professor, Dept. of Civil Engineering, Colorado State Univ., Fort Collins, CO 80523.
4. Research Leader, Great Plains Systems Research, Agricultural Research Service, U.S. Dept. of Agriculture, Fort Collins, CO 80521.