1. Engineer, MWH Americas, Inc., 3321 Power Inn Road, Suite 300, Sacramento, Calif. 95826.formerly, Research Assistant, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, Calif., 90095.
2. Assistant Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, La., 70803.formerly, Postdoctoral Scholar, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, Calif., 90095.
3. Distinguished Professor and Chair, Dept. of Civil and Environmental Engineering, Univ. of California, Los Angeles, Calif., 90095.