+1 vote
in Irrigation Engineering by (75.2k points)
What is the expected solution for the case when the T.W.C is lying above the J.H.C curve at all discharges?

(a) By providing a simple concrete apron of length 5(Y1 – Y2)

(b) By providing a sloping apron above the river bed

(c) By providing a sloping apron below the river bed

(d) Provision of a ski-jump bucket

The question was asked in unit test.

My question is based upon Energy Dissipation Below Overflow Spillway in portion Spillways, Energy Dissipators and Spillway Gates of Irrigation Engineering

1 Answer

0 votes
by (106k points)
The correct option is (b) By providing a sloping apron above the river bed

The explanation is: When the TWC is lying above the JHC at all discharges, the problem can be solved by-

1) By constructing a sloping apron above the river bed

2) By providing a roller bucket type of energy dissipator.

In this case, the jump is formed at the toe will be drowned by the tail-water and little energy will be dissipated.

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