Ben Rohrbach, U.S. Army Corps of Engineers Nashville District Hydrology and Hydraulics Division chief, talks about water management, June 17, 2013 as Teacher Angela Galloway listens. A group of four teachers from Stratford STEM Magnet High School visited the Nashville District Headquarters in Nashville, Tenn., and participated in a teacher externship to develop project based learning curriculum. (USACE photo by Leon Roberts)