1. Assoc. Prof., Dept. of Civ. and Envir. Engrg., Pennsylvania State Univ., University Park, PA 16802.
2. Prof., School of Envir. Sci., Univ. of East Anglia, Norwich NR4 7TJ, U.K.
3. Grad. Res. Asst., Dept. of Civ. and Envir. Engrg., Pennsylvania State Univ., University Park, PA 16802.
4. Prin. Hydrologist, Wildland Hydrology, Pagosa Springs, CO 81147.