1. P.E.
2. P.E., Members, ASCE
3. Asst. Prof., Univ. of Massachusetts at Amherst, Dept. of Civ. and Envir. Engrg., 139 Marston Hall, Box 35205, Amherst, MA 01003–5205.
4. Assoc. Prof., Univ. of Texas at Austin, Dept. of Civ. Engrg., Phil M. Ferguson Engrg. Lab., 10100 Burnet Rd., Bldg. 177, Austin, TX 78758.