TOPIC: Coverage of the annual Arizona water conference at the University of Arizona. Interviews with experts and participants about state water present and future, looking 50 years out. GUESTS: Sharon Megdal, director, Water Resources Research Center, University of Arizona Carly Jerla, program manager, Colorado River Basin Water Supply and Demand Study, U.S. Bureau of Reclamation Jim Leenhouts, associate director, Arizona Water Science Center, U. S. Geological Survey Elma MontaƱa, vice director, Human, Social and Environmental Sciences Institute, National Scientific and Technical Research Council, Mendoza, Argentina David Roberts, Senior Director, Water Resource management, Salt River Project