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Calculate the hydraulic diameter for a rectangular duct having 10m width and 6m depth.

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+2 votes
in Fluid Mechanics by (118k points)
Calculate the hydraulic diameter for a rectangular duct having 10m width and 6m depth.

(a) 5.5m

(b) 6.5m

(c) 7.5m

(d) 8.5m

I have been asked this question in unit test.

My enquiry is from Geometrical Properties of Rectangular Section topic in section Flow in Open Channels of Fluid Mechanics

1 Answer

+2 votes
by (362k points)
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Best answer
The correct answer is (c) 7.5m

The explanation is: Hydraulic diameter = 2By / B + y

Hydraulic diameter = 2(10) (6) / 16

Hydraulic diameter = 7.5m.

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