1. Design and Planning Engr., Puerto Rico Aqueduct and Sewer Authority, Santurce, Puerto Rico; formerly, U.S. Environmental Protection Agency Fellow, Dept. of Civ. Engrg., State Univ. of New York at Buffalo, Buffalo, N.Y.
2. Assoc. Prof., Dept. of Civ. Engrg., State Univ. of New York at Buffalo, Buffalo, N.Y.
3. Asst. Prof., Dept. of Civ. Engrg., State Univ. of New York at Buffalo, Buffalo, N.Y.