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Question

The field capacity of a certain soil is 20% and the moisture content of the soil before irrigation is 10%. What is the approximate depth upto which the soil will be wetted with an application of 50 mm of water?
[Take dry unit weight of soil as 15kN/m3 and unit weight of water as 10kN/m3]

A
250 mm
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B
333 mm
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C
367 mm
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D
433 mm
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Solution

The correct option is B 333 mm
Depth of water applied,

=γdγw×d×[Field capacity - Moisture content before irrigation]

50=1510×d×[0.200.10]

d=50×1015×0.1=333.33mm333mm

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