1. Assistant Professor, Dept. of Civil Engineering, North Dakota State Univ., 1410 14th Ave. North, Fargo, ND 58105; formerly, Annis Water Resources Institute, Grand Valley State Univ., Muskegon, MI 49441.
2. Professor and Director, Annis Water Resources Institute, Grand Valley State Univ., 740 W. Shoreline Dr., Muskegon, MI 49441.