Previously on HN:<p>America's Achilles' heel: the Mississippi River's Old River Control Structure (<a href="https://news.ycombinator.com/item?id=2547928" rel="nofollow">https://news.ycombinator.com/item?id=2547928</a>) (12 comments)<p>Relevant Wikipedia article: <a href="https://en.wikipedia.org/wiki/Old_River_Control_Structure" rel="nofollow">https://en.wikipedia.org/wiki/Old_River_Control_Structure</a>