1. Research Hydraulic Engineer, U.S. Army Corps of Engineers (USACE), Engineering Research and Development Center (ERDC), Coastal and Hydraulics Laboratory (CHL), 3909 Halls Ferry Rd, Vicksburg, MS 39180 (corresponding author).
2. Research Hydraulic Engineer, National Sedimentation Laboratory (NSL), Agricultural Research Service (ARS), U.S. Dept. of Agriculture (USDA), 598 McElroy Drive, Oxford, MS 38655.
3. Professor, Civil and Environmental Engineering, 306 C, Maxwell Stanley Hydraulics Laboratory, Univ. of Iowa, Iowa City, IA 52242-1585.