The Journal of the American Water Resources Association (JAWRA) is dedicated to publishing original papers characterized by their broad approach to water resources issues. Water by its nature is complex. Therefore, effectively managing water resources requires a broad understanding of many concepts and their applications, as plans based on a single outlook - only engineering, only biology, only ecomonics, or only law - tend to have unhappy outcomes. Decisions makers addressing water resources challenges require access to high quality science and research presented from a variety of perspectives. JAWRA has been focused on this objective for more than 40 years.