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

That’s not an answerable question – it depends on the size and source of the waterfall. Some are fed by ice melt or by springs, and don’t usually run dry. Others are fed by rivers, and may go dry if there’s a drought. Others are fed just by rain, and don’t last long.