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The capillary siphoning will take place if the top of the core is situated at height y _______ which is above H.F.L.

(a) greater than capillary rise hc

(b) lesser than capillary rise hc

(c) equal to capillary rise hc

(d) zero

The question was posed to me in an interview.

The origin of the question is Capillary Siphoning topic in chapter Soil Water Effective and Neutral Stresses of Geotechnical Engineering I

1 Answer

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Best answer
The correct option is (b) lesser than capillary rise hc

Easy explanation: When the height of impervious core of the earth dam is less than that of the capillary rise, then due to the capillary action, the water from one side of the dam will move to the other side over the impervious core by a phenomenon known as capillary siphoning.

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