1. Water Resources Engineer and Scientist, Ecofish Research Ltd., 595 Howe St., Vancouver, BC, Canada V6C 2T5.
2. Postdoctoral Fellow, Dept. of Civil and Environmental Engineering, Univ. of Alberta, 9211-116 St. NW, Edmonton, AB, Canada T6G 1H9.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of Alberta, 9211-116 St. NW, Edmonton, AB, Canada T6G 1H9 (corresponding author).
4. Professor Emeritus, Dept. of Civil and Environmental Engineering, Univ. of Alberta, 9211-116 St. NW, Edmonton, AB, Canada T6G 1H9.