1. Doctoral Student, Dept. of Civil and Environmental Engineering, Univ. of California, Davis, CA 95616.
2. Senior Engineer, California Dept. of Water Resources, 1416 9th St., Sacramento, CA 95814.
3. Professor, Dept. of Civil and Environmental Engineering, Univ. of California, Davis, CA 95616.
4. Professor, Dept. of Civil, Architectural, and Environmental Engineering, Univ. of Texas, Austin, TX 78712.