The answer is known to scientists and supported by basic physics, but we wanted to see it for ourselves. So, instead of waiting for a flood, we built a model river valley & flooded it propub.li/2M9uNKJ
![](https://pbs.twimg.com/media/DkLBo5JW4AAkPJw.jpg)
![](https://pbs.twimg.com/media/DkLBo5KX0AANzqL.jpg)
![](https://pbs.twimg.com/media/DkLBo5MW4AAP1TP.jpg)
![](https://pbs.twimg.com/media/DkLC6alX0AEN6bv.jpg)
![](https://pbs.twimg.com/media/DkLC9oyW0AMpmkv.jpg)
propub.li/2KChcqR
![](https://pbs.twimg.com/media/DkLDad1XsAYXHsI.jpg)
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