تنداب

Also known as rapid

thumb|Rapids of Kern River, [[California, USA.]] Rapids are sections of a river where the river bed has a relatively steep gradient, causing an increase in water velocity and turbulence. Flow, gradient, constriction, and obstacles are four factors that are needed for a rapid to be created.

AI overview

Rapids are sections of a river where the riverbed slopes steeply, which causes the water to flow faster and become turbulent. They form when certain conditions exist together—including water flow, a steep gradient, a narrowing of the river channel, and obstacles in the water—making rapids important features that significantly affect how rivers behave.

AI-generated from the Wikipedia summary — may contain errors.