ScienceDaily: At the end of December 2015, a huge storm named "Goliath" dumped 9-10 inches of rain in a belt across the central United States, centered just southwest of St. Louis, most of it in a three-day downpour. The rain blanketed the Meramec Basin, an area of 4,000 square miles drained by the Meramec River, which enters the Mississippi River south of St. Louis. The Meramec's response was dramatic. Gauging stations recorded a pulse of water that grew as it traveled down the main stem of the Meramec River,...