1. Research Hydraulic Engineer, U.S. Dept. of Agriculture, Agricultural Research Service (USDA-ARS), U.S. Arid Land Agricultural Research Center, 21881 N. Cardon Ln., Maricopa, AZ 85138 (corresponding author).
2. Information Technology Specialist, U.S. Dept. of Agriculture, Agricultural Research Service (USDA-ARS), U.S. Arid Land Agricultural Research Center, 21881 N. Cardon Ln., Maricopa, AZ 85138.
3. Senior Hydraulic Engineer, West Consultants, Inc., 8950 S 52nd St. # 210, Tempe, AZ 85284; formerly, Director, U.S. Dept. of Agriculture, Agricultural Research Service (USDA-ARS), Arid Land Agricultural Research Center, 21881 N. Cardon Ln., Maricopa, AZ 85138.