1. Assistant Professor, Dept. of Civil Engineering, Suleyman Demirel Univ., 32001 Isparta, Turkey. E-mail: dogan@mmf.sdu.edu.tr
2. Associate Professor, Water Resources Research Center, Dept. of Civil and Coastal Engineering, Univ. of Florida, P.O. Box 116580, Gainesville, FL 32611-6580.