1. Assistant Professor, Dept. of Water Engineering, Univ. of Guilan, Rasht, Iran.
2. Assistant Professor, Dept. of Civil Engineering, Univ. of Ottawa, 161 Louis Pasteur St., Ottawa, ON, Canada, K1N 6N5 (corresponding author). E-mail: crennie@genie.uottawa.ca
3. Associate Professor, Dept. of Civil Engineering, Tarbiat Modares Univ., Tehran, Iran.
4. Professor Emeritus, Dept. of Civil Engineering, Univ. of Ottawa, Ottawa, ON, Canada K1N 6N5.