1. Research Hydraulic Engineer, USDA-ARS U.S. Arid Land Agricultural Research Center, 21881 North Cardon Lane, Maricopa AZ 85238 (corresponding author).
2. Research Hydraulic Engineer, USDA-ARS U.S. Arid Land Agricultural Research Center, 21881 North Cardon Lane, Maricopa AZ 85238.
3. Senior Hydraulic Engineer, West Consultants, 8950 S 52nd Street Suite 210, Tempe, AZ
85284-1043; formerly, Laboratory Director, USDA-ARS Arid Land Agricultural
Research Center.