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What is the hydraulic radius for a wide rectangular channel section?

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+1 vote
in Fluid Mechanics by (118k points)
What is the hydraulic radius for a wide rectangular channel section?

(a) 3y

(b) 2y

(c) y

(d) y/2

This question was posed to me at a job interview.

Question is from Gradually Varied Flow in Wide Rectangular Channels topic in section Non Uniform Flow in Channels of Fluid Mechanics

1 Answer

+2 votes
by (362k points)
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Best answer
Right choice is (c) y

Easy explanation: For a wide rectangular channel B>>y

A = By; P = B+2y = B (since B>>y)

R = ^A⁄P = y.

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