Kenneth N. Brooks is professor of forest hydrology, Department of Forest Resources, University of Minnesota, St. Paul Peter F. Ffolliott is professor of watershed management, School of Renewable Natural Resources, University of Arizona, Tucson Hans M. Gregersen is professor emeritus, Department of Forest Resources and Department of Agricultural and Applied Economics, University of Minnesota, St. Paul Leonard F. DeBano is professor of watershed management, School of Renewable Natural Resources, University of Arizona, Tucson.