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in Irrigation Engineering by (75.2k points)
The coefficient of permeability indicates the ease with which water can flow through a soil mass. The soil type which has less permeability is __________

(a) gravelly soil

(b) clayey soil

(c) sandy soil

(d) both sandy and gravel soil

This question was addressed to me in a job interview.

This intriguing question originated from Factor Controlling Occurrence of Ground Water topic in portion Ground Water for Irrigation through Wells and Tubewells of Irrigation Engineering

1 Answer

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by (106k points)
Correct answer is (b) clayey soil

To explain: The approximate average value of the coefficient of permeability in clayey soil is 0.04 x 10^-5 cm/sec. The permeability coefficient of gravel soil is of the order of 4cm/sec and for sandy soil is 0.04 cm/sec.

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