Peter A. Troch1,2* Guillermo F. Martinez1 Valentijn R. N. Pauwels3 Matej Durcik4 Murugesu Sivapalan5,6 Ciaran Harman6 Paul D. Brooks1,4 Hoshin Gupta1,4 and Travis Huxman7,2 1 Department of Hydrology and Water Resources, University of Arizona, USA 2 Biosphere 2 Earthscience, University of Arizona, USA 3 Laboratory of Hydrology and Water Management, Ghent University, Belgium 4 SAHRA (Sustainability of semi-arid hydrology and riparian areas), University of Arizona, USA 5 Department of Geography, University of Illinois at Urbana-Champaign, USA 6 Department of Civil and Environmental Engineering, University of Illinois at Urbana-Champaign, USA 7 Department of Ecology and Evolutionary Biology, University of Arizona, USA