People who visit Arizona are often surprised to find rivers that are missing a key element: water.

The occurrence is more common than not in the state, with increasing populations and associated demands, that element may become even more scarce.

A new book from the University of Arizona Press looks at one dry river, Tucson's Rillito. "Ground|Water: The Art, Design and Science of A Dry River" is described as "an ode to a dry river, the kind of river most familiar with those who dwell in Southern Arizona."

The work cites science, art and community efforts to raise awareness of the problems.