Congress expands Great Lakes dredging http://greatlakesecho.org/2014/04/09/congress-expands-great-lakes-dredging-16-projects-planned-in-michigan-wisconsin/ Everybody knows water flows, but not many people know that the sediment below it does too. That’ s why harbors need dredging, or excavating the gradually accumulated material at the bottom of the water and transporting it elsewhere. U.S. Army Corps of Engineers Detroit District had planned eight dredging projects […]