A flume is a channel that is constructed to divert a flow of water for a specific purpose. Many students recognize the term flume from experience with an amusement park ride called the “log flume.” For the inquiry-based activities described here, the flume is a Plexiglas structure that is 44 inches long, 5 inches wide, and 4¾ inches deep, with a perforated piece of Plexiglas inserted approximately 6 inches from one end. On the other end, there is a drain tube affixed by a PVC connector.