Lots of folks in Black Mountain believe in living in a more "natural way" than they used to, back in the cities, or whenever they visit the structures which show great engineering feats.
Here's a slightly more natural kind of dam...earthen that is, rather than concrete. It does have engineering proclaimed through a sluice gear which can be opened whenever there's flooding upstream in the mountains. It allows the lake to be drained quite a bit if needed.
There's the control valve.