They used an experimental technique, for one thing. http://www.nytimes.com/2014/08/19/us/19dam.html http://www.nytimes.com/2014/08/19/us/19dam.html http://www

They used an experimental technique, for one thing. http://www.nytimes.com/2014/08/19/us/19dam.html http://www.nytimes.com/2014/08/19/us/19dam.html http://www.circleofblue.org/2014/world/despite-delays-billions-overruns-olmsted-locks-dam-project-rolls/ http://www.circleofblue.org/2014/world/despite-delays-billio...