1. Graduate Research Assistant, Dept. of Biosystems and Agricultural Engineering, Oklahoma State Univ., 111 Agricultural Hall, Stillwater, OK 74078.
2. Physical Hydrologist, USDA-ARS National Sedimentation Laboratory, 598 McElroy Dr., Oxford, MS 38655,
3. Assistant Professor, Dept. of Biosystems and Agricultural Engineering, Oklahoma State Univ., 120 Agricultural Hall, Stillwater, OK 74078 (corresponding author).