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PERMEABILITY
Page 3


PERMEABILITY
What is permeability?
• Property of a soil which permits the flow of water
• Permeability is defined as the property of a porous
material which permits the passage or seepage of water
through its interconnecting voids.
• It is a very important Engineering property
gravels highly permeable
stiff clay                        least permeable
Page 4


PERMEABILITY
What is permeability?
• Property of a soil which permits the flow of water
• Permeability is defined as the property of a porous
material which permits the passage or seepage of water
through its interconnecting voids.
• It is a very important Engineering property
gravels highly permeable
stiff clay                        least permeable
Page 5


PERMEABILITY
What is permeability?
• Property of a soil which permits the flow of water
• Permeability is defined as the property of a porous
material which permits the passage or seepage of water
through its interconnecting voids.
• It is a very important Engineering property
gravels highly permeable
stiff clay                        least permeable
• Calculation of uplift pressure under hydraulic structure and
their safety against piping
• Ground water flow towards wells and drainage of soil
• Calculation of seepage through the body of earth dams and
stability of slopes
• Determination of rate of settlement of a saturated
compressible soil layer
Permeability through soil is important for the 
following engineering problems:
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FAQs on PPT: Permeability of Soils - Soil Mechanics - Civil Engineering (CE)

1. What is permeability of soils?
Ans. Permeability of soils refers to the ability of soil to allow the flow of water or other fluids through it. It is a measure of how easily water can pass through the soil particles and void spaces within the soil.
2. How is the permeability of soils determined in civil engineering?
Ans. The permeability of soils is determined through laboratory tests such as the constant head permeability test or the falling head permeability test. These tests involve measuring the rate of flow of water through a soil sample under controlled conditions.
3. What factors affect the permeability of soils?
Ans. Several factors can affect the permeability of soils, including the soil type, grain size distribution, compaction, soil structure, and moisture content. Coarse-grained soils such as sands and gravels generally have higher permeability compared to fine-grained soils like clays.
4. Why is the permeability of soils important in civil engineering?
Ans. The permeability of soils is an important parameter in civil engineering as it affects the drainage characteristics and stability of soil. It is crucial for designing foundations, embankments, retaining walls, and drainage systems. Understanding the permeability helps in assessing the suitability of soils for different engineering applications.
5. How can the permeability of soils be improved?
Ans. The permeability of soils can be improved through various techniques, such as compaction, adding permeable materials like sand or gravel to the soil, installing drainage systems, or using geosynthetic materials. These methods aim to increase the void spaces within the soil and enhance the flow of water through it.
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