1. Research Hydraulic Engineer, U.S. Arid Land Agricultural Research Center, USDA-ARS, 21881 N. Cardon Ln., Maricopa, AZ 85238 (corresponding author).
2. Research Hydraulic Engineer, Center Director, U.S. Arid Land Agricultural Research Center, USDA-ARS, 21881 N. Cardon Ln., Maricopa, AZ 85238.
3. Research Hydraulic Engineer, U.S. Arid Land Agricultural Research Center, USDA-ARS, 21881 N. Cardon Ln., Maricopa, AZ 85238.