1. Assistant Professor, Dept. of Water Resources Engineering, Bangladesh Univ. of Engineering and Technology, Dhaka 1000, Bangladesh.
2. Research Engineer, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, CA 90095-1593.
3. Associate Director, Center for Environmental and Water Resources Engineering, Dept. of Civil and Environmental Engineering, Univ. of California, Davis, CA 95616.
4. Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, CA 90095-1593 (corresponding author).