1. Asst. Prof., Dept. of Civ. and Envir. Engrg., Univ. of Western Ontario, London, ON, Canada N6A 5B9.
2. Assoc. Prof., Dept. of Civ. and Envir. Engrg., Univ. of Alberta, Edmonton, AB, Canada T6G 2G7.
3. Prof., Dept. of Civ. and Envir. Engrg., Univ. of Alberta, Edmonton, AB, Canada T6G 2G7.