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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, 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.

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.

[[Category:Fluid mechanics]]

[[Category:Fluid mechanics]]

[[Category:Engineering]]

[[Category:Engineering]]