1. Assistant Professor, Faculty of Engineering and Architecture, Dept. of Environmental Engineering, Balikesir Univ., 10100 Cagis, Balikesir, Turkey.
2. Assistant Professor, Faculty of Engineering, Dept. of Environmental Engineering, Dokuz Eylul Univ., Kaynaklar Campus, 35160 Buca, Izmir, Turkey (corresponding author).
3. Professor, Dept. of Civil and Environmental Engineering, Box 5710, Clarkson Univ., Potsdam, NY 13699.