waterfall

A waterfall is generally defined as a point in a river , water flows over a steep drop that is close to vertical. "The horizontal distance between the positions of the lip and plunge pool should be no more than c 25% of the waterfall height." There are various types and methods to classify waterfalls.Some scholars have included rapids as a subsection. What actually constitutes a waterfall continues to be debated.

Waterfalls are sometimes interchangeably referred to as "cascades" and "cataracts", though some sources specify a cataract as being a larger and more powerful waterfalland a cascade as being smaller. A plunge pool is a type of stream pool formed at the bottom of a waterfall.