1. Research Professor, Environmental Research Group, Dept. of Civil Engineering, Institute for the Study of Earth, Oceans and Space, Univ. of New Hampshire, Durham, NH 03824 (corresponding author).
2. Water Resources Engineer, ESS Group, Waltham, MA 02451.
3. Professor, Dept. of Civil and Environmental Engineering, Tufts Univ., Medford, MA 02155.
4. Associate Professor, Dept. of Civil and Environmental Engineering, Worcester Polytechnic Institute, Worcester, MA 01609.
5. Research Associate, U.S. Geological Survey Conte Anadromous Fish Research Center, 1 Migratory Way, Turners Falls, MA 01301.
6. Environmental Engineer, Vertex Environmental Services, 1 Congress St., Boston, MA 02114.