Eos (Washington, D.C., March 28) – Over the past 50 years, hydrology has experienced a revolution in theory, technical application and interdisciplinary collaboration. Space-based topographic data, real-time weather telemetry and advances in computer technology have created a new, data-rich environment that has drastically changed how hydrology research is conducted and applied. “There’s an elephant in the room, though, the direct change that comes from humans,” says Murugesu Sivapalan, a professor of civil and environmental engineering at Illinois.