huh, neat. Kinda how beavers made beaver dams all over the place, slowing down water flows and keeping water in the ecosystem instead of washing it downhill. But this is same principle in the plains.

Also reminds me of Zai holes or crescent-dikes for rainwater harvesting and planting. Apparently it's a technique being used to limit and reforest the encroachment of the Sahara. https://en.wikipedia.org/wiki/Za%C3%AF