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[[File:Hydraulicjump.jpg|300px|thumb|right|A hydraulic jump in the river]]

[[File:Hydraulicjump.jpg|300px|thumb|right|A hydraulic jump in the river]]

A '''hydraulic jump''' is a discrepancy in water depths. When water in a stream flows over a rock, the water may reach supercritical speed — that is, the speed of the water may exceed the speed that waves propagate at. If so, there will be a sudden change in the water's height so that the speed of the water is reduced to subcritical speed.

A '''hydraulic jump''' is a discrepancy in water depths. When water in a stream flows over a rock, for example, the water may reach a very high speed due to the decrease in the height of the water. (This is due to the continuity equation, (initial velocity)(initial height) = (final velocity)(final height).)* If the speed increases greatly, it may exceed the speed that waves propagate at; such a speed is called "super-critical" flow. In this case, a sudden jump in the water's height will occur so that the speed of the water is reduced to sub-critical speed.

The equation that governs this phenomena is:

The equation that governs this phenomena is:

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<math>F_1</math> is called the Froude number, <math>V_1</math> is the speed of the water, <math>g</math> is the acceleration due to gravity, and <math>Y_1</math> is the depth of the water.

<math>F_1</math> is called the Froude number, <math>V_1</math> is the speed of the water, <math>g</math> is the acceleration due to gravity, and <math>Y_1</math> is the depth of the water.

==See also==

==See also==