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Byju's Answer
Standard IX
Physics
Relative Density
For a hydraul...
Question
For a hydraulically efficient rectangular channel of bed width 5 m, the hydraulic radius is equal to
A
2.5 m
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B
2 m
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C
5 m
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D
1.25 m
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Solution
The correct option is
D
1.25 m
For the most efficient rectangular channel,
H
y
d
r
a
u
l
i
c
r
a
d
i
u
s
=
y
2
D
e
p
t
h
,
y
=
B
2
∴
R
=
y
2
=
(
B
/
2
2
)
=
B
4
=
5
4
=
1.25
m
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1
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