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Question

A weir on a permeable foundation with a downstream sheet pile is shown in the figure below. The exit gradient as per Khosla's method is


A
1 in 6.0
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B
1 in 5.0
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C
1 in 3.4
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D
1 in 2.5
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Solution

The correct option is C 1 in 3.4
As per Khosla's method,
Exit gradient,
GE=Hd.1πλ

Where, λ=12[1+1+α2]

and α=bd

Here, B = 10 m
depth of sheet pile,
d = 4m
Head loss, H = 5m
α=104=2.5

λ=12[1+1+2.52]=1.846

GE=Hd.1πλ

=541π1.846=0.293=13.41


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