“What about the water?” was one of the questions Morrison Institute for Public Policy asked in its 2008 study, "Megapolitan: Arizona’s Sun Corridor". That report looked at the potential growth of the Sun Corridor as Tucson and Phoenix merge into one continuous area for economic and demographic purposes.

With its brief review of the water situation in urban Arizona, "Megapolitan" left a number of questions unanswered. This report will consider questions like these in more detail in order to examine the Sun Corridor’s water future. This topic has received less sophisticated public discussion than might be expected in a desert state. Arizona’s professional water managers feel they are relatively well prepared for the future and would like to be left alone to do their job. Elected officials and economic-development professionals have sometimes avoided discussing water for fear of reinforcing a negative view of Arizona. This report seeks to contribute to this understanding, and to a more open and informed conversation about the relationship of water and future growth.

The Phoenix metropolitan area is known worldwide for the rapid and continuous expansion of its population, economy, and development of desert land. Even during recessionary periods, it has continued to grow. Leaders in other metropolitan areas envy this achievement and the many benefits it has created for Valley residents. But some members of our region, both leaders and lay people alike, consider the Valley’s phenomenal growth to be a mixed blessing. Indeed, they would say we are plagued by success. The purpose of this brief paper is to create a framework for discussion of how our region’s future growth can embody quality. It is not intended to be a comprehensive Morrison Institute for Public Policy treatment of the myriad issues of urban growth. Because of this paper’s brevity, some important details about growth are not included. Fortunately, detailed studies of the Valley’s growth have been done before (e.g., by Gruen Associates/Maricopa Association of Governments in 1975 and the Morrison Institute in 1988). Instead, this paper identifies key concepts and suggests questions to be used as a point of departure for steering a future course.