1. Professor and Director, Hydrologic Science and Engineering Program and Environmental Science and Engineering Division, Colorado School of Mines, Golden, CO 80401 (corresponding author). E-mail: jmccray@mines.edu
2. Professor, Dept. of Bioproducts and Biosystems Engineering, Univ. of Minnesota, St. Paul, MN 55108.
3. Professor, Hydrologic Science and Engineering Program and Dept. of Geology and Geological Engineering, Colorado School of Mines, Golden, CO 80401.