1. Assistant Professor, Dept. of Civil and Environmental Engineering, Washington State Univ., Albrook Hydraulics Laboratory, Pullman, WA 99164-2910.
2. Professor, Dept. of Civil and Environmental Engineering, Virginia Tech, Blacksburg, VA 24061.
3. Assistant Professor, Dept. of Management Information Sciences, California State Univ., Sacramento, CA 95819-6088.
4. Professor, Dept. of Statistics, Washington State Univ., Pullman, WA 99164.