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What is the value of Lane’s coefficient for fine sand and coarse sand?

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+1 vote
in Irrigation Engineering by (75.2k points)
What is the value of Lane’s coefficient for fine sand and coarse sand?

(a) 7 and 5

(b) 5 and 7

(c) 7 and 8.5

(d) 7 and 9

I have been asked this question in semester exam.

Origin of the question is Seepage Theories topic in division Seepage Theories and Weirs and Barrages Design of Irrigation Engineering

1 Answer

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by (106k points)
The correct choice is (a) 7 and 5

The best explanation: For very fine sand or silt, the value of Lane’s coefficient is 8.5. For fine sand and coarse sand, the value is 7.0 and 5.0 respectively. Also, the safe hydraulic gradient should be less than 1/7 and 1/5 for fine sand and coarse sand respectively.

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