1. Research Agriculture Engineer, Grazinglands Research Laboratory, 7207 West Cheyenne St., El Reno, OK 73036 (corresponding author).
2. Research Hydraulic Engineer, Grazinglands Research Laboratory, 7207 West Cheyenne St., El Reno, OK 73036.
3. Research Hydrologist, Grazinglands Research Laboratory, 7207 West Cheyenne St., El Reno, OK 73036.