1. Assoc. Prof. of Civ. Engrg.; Virginia Polytechnic Inst. and State Univ., Blacksburg, Va.
2. Manager; Development, Water Management/Research and Development, The Carborundum Co., Niagara Falls, N.Y.
3. Engr. Consultant; Criteria and Standards Div., Office of Water Supply, Environmental Protection Agency, Washington, D.C.
4. Prof.; Dept. of Civ. Engrg., Virginia Polytechnic Inst. and State Univ., Blacksburg, Va.