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The quantum of water contained in the soil pores which cannot be extracted by gravity drainage is called _____________

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in Irrigation Engineering by (75.2k points)
The quantum of water contained in the soil pores which cannot be extracted by gravity drainage is called _____________

(a) pellicular water

(b) capillary water

(c) hygroscopic water

(d) available water

I have been asked this question in a national level competition.

The doubt is from Aquifers and Their Type-1 in division Ground Water for Irrigation through Wells and Tubewells of Irrigation Engineering

1 Answer

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by (106k points)
The correct choice is (a) pellicular water

The best explanation: When the saturated formations are drained under the action of gravity drainage, the volume of water drained is less than the volume of void space. The water contained in these voids cannot be drained out by force of gravity. The water which is always retained by these interstices due to molecular attraction is called pellicular water.

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