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Standard USBR stilling basin-II is useful for energy dissipation at the bottom of the overflow structure, if the approaching Froude number is ________________

(a) less than 4.5

(b) more than 4.5

(c) less than 2.5

(d) more than 2.5

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I need to ask this question from Energy Dissipation Below Overflow Spillway in portion Spillways, Energy Dissipators and Spillway Gates of Irrigation Engineering

1 Answer

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by (106k points)
The correct answer is (b) more than 4.5

The explanation: USBR has standardized stilling basins for different Froude numbers. USBR stilling basin- II is recommended for large structures when the Froude number is more than 4.5. The dissipation of energy will be 45 to 85%.

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