1. Hydraulic Engineer, Mussetter Engineering, Inc., 1730 South College Ave., Fort Collins, CO 80525.
2. Assistant Professor and Director, Dept. of Civil and Environmental Engineering, Engineering Research Center and Hydraulics Laboratory, Colorado State Univ., Fort Collins, CO 80523.
3. Professor, Dept. of Civil and Environmental Engineering, Colorado State Univ., Fort Collins, CO 80523 (corresponding author).