Levees are intended to prevent flooding in the areas they are built, but they change the direction and speed of flowing water, which can cause unintended flooding in areas upstream. ProPublica and Reveal collaborated with the St. Anthony Falls Laboratory to build a scale model to show how this can happen.

An interactive graphic lets you shift flow rate up and down to see the changes yourself. The video coupled with the illustration makes the effects super clear.

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Nathan Yau
http://flowingdata.com

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