1. Assistant Professor, Dept. of Natural and Social Sciences, New England College, 98 Bridge St., Henniker, NH 03242 (corresponding author).
2. Director of Research Unit, IRSTEA, UMR G-EAU, 361, Rue J.-F. Breton, 34033 Montpellier Cedex 1, France.
3. Research Professor, Environmental Research Group of Dept. of Civil Engineering and Institute for the Study of Earth, Oceans and Space, Univ. of New Hampshire, 35 Colovos Rd., Gregg Hall, Durham, NH 03824.
4. Program Manager, Boston Bikes, Boston City Hall, Suite 932, Boston, MA 02201; formerly, Community Building and Environment, Neighborhood of Affordable Housing, 143 Border St., East Boston, MA 02128.