1. Assistant Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70803-6405; formerly, Research Scholar, Dept. of Water Resources Engineering, Lund Univ., Box 118, S-22100 Lund, Sweden.
2. A. K. Barton Professor, Dept. of Civil and Environmental Engineering, Louisiana State Univ., Baton Rouge, LA 70803-6405.
3. Professor, Dept. of Water Resources Engineering, Lund Univ., Box 118, S-22100 Lund, Sweden.