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  1. A little factoid I picked while prepping for discussions about The Control of Nature: uncontrolled rivers escape their banks, on average, every year and a half. If the average flow decreases, they deposit sediment and decrease their channel volume; if the average flow increases, they erode a larger channel.

    Students seem to think that rivers aren’t supposed to flood, ever. I was surprised by how often they do, when they aren’t managed by dams or levees.

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