+1 vote
in Irrigation Engineering by (75.2k points)
The Froude number of a hydraulic jump is 5.5. The jump can be classified as ____________

(a) a weak jump

(b) an oscillating jump

(c) rough and choppy jump

(d) steady jump

The question was posed to me during an interview.

This interesting question is from Energy Dissipation Below Overflow Spillway in section Spillways, Energy Dissipators and Spillway Gates of Irrigation Engineering

1 Answer

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by (106k points)
Right answer is (d) steady jump

Easy explanation: When the Froude number is in the range of 4.5 to 9.0, the jump is steady. This is generally the case of dams and spillways. The oscillating jump occurs between the range of 2.5 to 4.5 and when Froude number is less than 2.5, the jump is weak and when it is more than 9.0, the jump is rough and choppy.

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