A triangular channel section is most economical, when the side slope is :  

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OSSC JE Civil Mains Official Paper: (Held On: 16th July 2023)
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Answer (Detailed Solution Below)

Option 1 : 1 ∶ 1
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Explanation:
Most economical section is the one whose wetted perimeter is minimum for the given value of discharge.

For Traingular section,

m = tanθ

For most economical section, θ = 45o

m = tan 45o

m = 1

Hydraullic mean depth = \(\frac{{{y_o}}}{{2\sqrt 2 }}\)
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