1. Principal Scientist Emeritus, Center for Watershed Science, Illinois State Water Survey, Champaign, IL 61820-7445 (corresponding author). E-mail: nbhowmik@sws.uiuc.edu
2. Assistant Professor, Dept. of Civil Engineering, State Univ. of New York at Buffalo, Buffalo, NY.
3. Assistant Hydrologist, Center for Watershed Science, Illinois State Water Survey, Champaign, IL 61820-7445.
4. Head and Principal Scientist, Center for Watershed Science, Illinois State Water Survey, Champaign, IL 61820-7445.