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Four different soils are classified as CH, ML, SP, and SW, as per the Unified Soil Classification System. Which one of the following options correctly represents their arrangement in the decreasing order of hydraulic conductivity?
  • a)
    SW, SP, ML, CH
  • b)
    CH, ML, SP, SW
  • c)
    SP, SW, CH, ML
  • d)
    ML, SP, CH, SW
Correct answer is option 'A'. Can you explain this answer?
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Four different soils are classified as CH, ML, SP, and SW, as per the ...
Answer:

In the Unified Soil Classification System (USCS), soils are classified based on their properties such as particle size, plasticity, and permeability. One of the important properties of soil is hydraulic conductivity, which refers to the ability of soil to transmit water. Soils with higher hydraulic conductivity allow water to flow more easily compared to soils with lower hydraulic conductivity.

The given options are:

a) SW, SP, ML, CH
b) CH, ML, SP, SW
c) SP, SW, CH, ML
d) ML, SP, CH, SW

We need to arrange the soils in decreasing order of hydraulic conductivity.

Understanding the Soil Classification System:
Before determining the order of hydraulic conductivity, let's understand the meaning of the soil classifications:

- CH: Clayey soils with high plasticity.
- ML: Silty soils with low plasticity.
- SP: Sandy soils with poorly graded particles.
- SW: Sandy soils with well-graded particles.

Determining the Order of Hydraulic Conductivity:
To order the soils in decreasing order of hydraulic conductivity, we need to consider the properties of each soil classification.

- SW: Sandy soils with well-graded particles have the highest hydraulic conductivity among the given options. The well-graded particles provide better pathways for water flow.
- SP: Sandy soils with poorly graded particles have lower hydraulic conductivity compared to well-graded sandy soils. The poor gradation reduces the connectivity between particles, resulting in lower hydraulic conductivity.
- ML: Silty soils have lower hydraulic conductivity compared to sandy soils. The smaller particle size and higher cohesion reduce the flow of water.
- CH: Clayey soils have the lowest hydraulic conductivity among the given options. The fine particle size, high plasticity, and high cohesion significantly restrict the flow of water.

Order of Hydraulic Conductivity:
Based on the above understanding, the correct order of hydraulic conductivity for the given soil classifications is:

SW > SP > ML > CH

Therefore, the correct answer is option 'a': SW, SP, ML, CH.
Free Test
Community Answer
Four different soils are classified as CH, ML, SP, and SW, as per the ...
K ∝ (dia.)2
Sand > Silt > Clay
Sand > ML > CH
SW > SP > ML > CH
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