1. Associate Professor, Dept. of Civil Engineering, Saint Louis Univ., 3450 Lindell Blvd., St. Louis, MO 63103 (corresponding author).
2. Associate Professor and Hydraulics Laboratory Director, Dept. of Civil and Environmental Engineering, Engineering Research Center, Colorado State Univ., Fort Collins, CO 80523.
3. Emeritus Professor, Dept. of Civil and Environmental Engineering, Engineering Research Center, Colorado State Univ., Fort Collins, CO 80523.