1. Project Engineer, Northwest Hydraulic Consultants, 9819 12th Ave. S.W., Edmonton, AB, Canada T6X 0E3; formerly, Graduate Student, Dept. of Civil and Environmental Engineering, Univ. of Alberta, Edmonton, AB, Canada T6G 2W2.
2. Professor, Dept. of Civil and Environmental Engineering, Univ. of Alberta, Edmonton, AB, Canada T6G 2W2 (corresponding author).
3. Emeritus Professor, Dept. of Civil and Environmental Engineering, Univ. of Alberta, Edmonton, AB, Canada T6G 2W2.