1. Director, State of Washington Water Research Center and Associate Professor, Dept. of Civil and Environmental Engineering, Washington State Univ., Pullman, WA 99164-3002.
2. Assistant City Engineer, City of Wenatchee, 25 N. Worthen St., Wenatchee, WA 98801.
3. Professor, Dept. of Civil and Environmental Engineering, Washington State Univ., Pullman, WA 99164-2910.
4. President, Economic and Engineering Services, 111 SW 5th Ave., Suite 1670, Portland, OR 97204.