Water Management Section Chief Bob Sneed pours out excess water from a Kemmerer water sampler into J. Percy Priest Lake in Nashville, Tenn. Members of the U.S. Army Corps of Engineers Nashville District Water Management Section showed Stratford STEM Magnet High School teachers how to collect water samples and check water quality, June 17, 2013, as part of a teacher externship to help them develop project based learning curriculum. (USACE photo by Leon Roberts)