1. Research Scientist, Dept. of Civil Engineering, Engineering Research Center, Colorado State Univ., Fort Collins, CO 80523 (corresponding author).
2. Associate Professor and Hydraulic Laboratory Director, Dept. of Civil Engineering, Engineering Research Center, Colorado State Univ., Fort Collins, CO 80523.
3. Emeritus Professor, Dept. of Civil Engineering, Engineering Research Center, Colorado State Univ., Fort Collins, CO 80523.