James S Famiglietti1,2, Grant Ferguson3,2,4,5. 1. Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK S7N 3H5, Canada. jay.famiglietti@usask.ca. 2. School of Environment and Sustainability, University of Saskatchewan, Saskatoon, SK S7N 5C8, Canada. 3. Global Institute for Water Security, University of Saskatchewan, Saskatoon, SK S7N 3H5, Canada. 4. Department of Civil, Geological, and Environmental Engineering, University of Saskatchewan, Saskatoon, SK S7N 5A9, Canada. 5. Department of Hydrology and Atmospheric Sciences, University of Arizona, Tucson, AZ 85721-0011, USA.