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The diameter of the circular sewer is 0.2m. The desired depth of flow is __________

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The diameter of the circular sewer is 0.2m. The desired depth of flow is __________

(a) 2/3 of the circular section of sewer

(b) 1/3 of the circular section of sewer

(c) 1/2 of the circular section of sewer

(d) 1/4 of the circular section of sewer

I have been asked this question during an interview.

This intriguing question comes from Hydraulic Elements of Circular Sewers topic in portion Hydraulic Design of Sewers of Environmental Engineering

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Right option is (c) 1/2 of the circular section of sewer

The best I can explain: When the diameter of the sewer is up to 0.4m, they are designed to flow at 1/2 depth.

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