When the tail-water depths in the river downstream of a spillway are quite low such that the tail-water curve at all discharges lies below the post jump depth curve, then the energy dissipation can be affected best by ___________________

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When the tail-water depths in the river downstream of a spillway are quite low such that the tail-water curve at all discharges lies below the post jump depth curve, then the energy dissipation can be affected best by ___________________

asked Sep 26, 2023 in Irrigation Engineering by Carter (75.2k points)

When the tail-water depths in the river downstream of a spillway are quite low such that the tail-water curve at all discharges lies below the post jump depth curve, then the energy dissipation can be affected best by ___________________

(a) a roller bucket

(b) a ski-jump bucket

(c) either roller or ski-jump bucket

(d) a sloping apron

I got this question in an international level competition.

This intriguing question comes from Energy Dissipation Below Overflow Spillway topic in division Spillways, Energy Dissipators and Spillway Gates of Irrigation Engineering

1 Answer

Greg · Answer 1 · 2023-11-09T16:01:54+0000

The correct answer is (b) a ski-jump bucket

For explanation: Energy dissipation bucket called ski-jump bucket is used when the tail-water depth is insufficient or low at all discharge. It requires sound and rocky river bed. Water may shoot up out of the bucket and fail harmlessly into the river at some distance downstream of the bucket.

When the tail-water depths in the river downstream of a spillway are quite low such that the tail-water curve at all discharges lies below the post jump depth curve, then the energy dissipation can be affected best by ___________________

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