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Determine the field capacity, when the unit weight of water is 9.8 KN/m3, and volume of water stored in unit area of soil is 28 m3, the dry unit weight of soil is 18 KN/m3, and the depth of root zone of the plant is 7 m.
  • a)
    2.178 m2
  • b)
    2.135 m2
  • c)
    2.125 m2
  • d)
    2.25 m2
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
Determine the field capacity, when the unit weight of water is 9.8 KN/...
We have, field capacity (F) = (weight of water retained in unit area of soil / weight of same volume of dry soil)
Weight of water retained in unit area of soil = γw x volume of water stored in unit area
= 9.8 x 28
= 274.4 KN
Weight of same volume of dry soil = γd x d (where, γw = unit weight of water, γd = dry unit weight of soil)
= 18 x 7
= 126 KN/m2
Now field capacity (F) = (274.4 / 126)
= 2.178 m2.
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Community Answer
Determine the field capacity, when the unit weight of water is 9.8 KN/...
Field capacity is the amount of water retained in the soil after excess water has drained away under the influence of gravity. It represents the maximum amount of water that the soil can hold against gravity.

Given data:
Unit weight of water (γw) = 9.8 kN/m3
Volume of water stored in unit area of soil (Vw) = 28 m3
Dry unit weight of soil (γd) = 18 kN/m3
Depth of root zone of the plant (h) = 7 m

To determine the field capacity, we can use the following formula:

Field Capacity = (Vw / γw) - (h / γd)

Now, let's substitute the given values into the formula:

Field Capacity = (28 / 9.8) - (7 / 18)

Calculating the values,

Field Capacity = 2.857 - 0.389

Field Capacity = 2.468

Therefore, the field capacity is 2.468 m3.

However, the given options are in terms of area (m2) rather than volume (m3). To convert the field capacity from volume to area, we divide it by the depth of the root zone (h).

Field Capacity (in terms of area) = Field Capacity (in terms of volume) / h

Field Capacity (in terms of area) = 2.468 / 7

Field Capacity (in terms of area) ≈ 0.352 m2

Therefore, the correct option is not mentioned in the given options.
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Determine the field capacity, when the unit weight of water is 9.8 KN/m3, and volume of water stored in unit area of soil is 28 m3, the dry unit weight of soil is 18 KN/m3, and the depth of root zone of the plant is 7 m.a)2.178 m2b)2.135 m2c)2.125 m2d)2.25 m2Correct answer is option 'A'. Can you explain this answer? for Civil Engineering (CE) 2025 is part of Civil Engineering (CE) preparation. The Question and answers have been prepared according to the Civil Engineering (CE) exam syllabus. Information about Determine the field capacity, when the unit weight of water is 9.8 KN/m3, and volume of water stored in unit area of soil is 28 m3, the dry unit weight of soil is 18 KN/m3, and the depth of root zone of the plant is 7 m.a)2.178 m2b)2.135 m2c)2.125 m2d)2.25 m2Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Civil Engineering (CE) 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Determine the field capacity, when the unit weight of water is 9.8 KN/m3, and volume of water stored in unit area of soil is 28 m3, the dry unit weight of soil is 18 KN/m3, and the depth of root zone of the plant is 7 m.a)2.178 m2b)2.135 m2c)2.125 m2d)2.25 m2Correct answer is option 'A'. Can you explain this answer?.
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