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The hydraulic depth of a rectangular channel is 2m and its wetted area is 12m^2. Estimate its hydraulic radius.

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+1 vote
in Fluid Mechanics by (118k points)
The hydraulic depth of a rectangular channel is 2m and its wetted area is 12m^2. Estimate its hydraulic radius.

(a) 1.2m

(b) 1.3m

(c) 1.4m

(d) 1.5m

The question was asked during an online interview.

I want to ask this question from Geometrical Properties of Rectangular Section in division Flow in Open Channels of Fluid Mechanics

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Best answer
Correct choice is (a) 1.2m

Explanation: Hydraulic Depth (D) = A/ Top Width

2 = 12/ T

T = 6m

Hydraulic Radius (R) = A/P

P = T+ 2(D)

P = 6+ 2(2) = 10m

R = 12/ 10 = 1.2m.

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