Justin Johnson, University of Arizona, School of Natural Resources and the Environment, Tucson, United States, C. Jason Williams, USDA-ARS, Southwest Watershed Research Center, Tucson, AZ, United States, Viktor Polyakov, USDA-ARS, Tucson, AZ, United States and Cameron Burleson, University of Arizona, School of Natural Resources and the Environment, Tucson, AZ, United States