eli5: How long will it take for a waterfall to run out of water and how does it originate?

Question

eli5: How long will it take for a waterfall to run out of water and how does it originate?

In: Earth Science

Answer 1

A waterfall is just a height drop in the geography of a river. There’s nothing special about it compared to any other section of the river. It runs out of water when the river runs out.