How does grain size affect porosity?

Porosity increases as grain size decreases for very well sorted naturally deposited sands. For a combination of two and three grain sizes in the same proportion, the mixtures for small grain sizes give higher porosity values than mixtures for large gain sizes.

How does porosity affect permeability?

More specifically, porosity of a rock is a measure of its ability to hold a fluid. Permeability is a measure of the ease of flow of a fluid through a porous solid. A rock may be extremely porous, but if the pores are not connected, it will have no permeability.

Does high permeability mean high porosity?

Water Moves Underground Porosity is great for telling us how much water the soil or sediment can hold, but it’s also important to know how that water can move through those spaces underground. But just because a soil has a high porosity doesn’t necessarily mean it has a high permeability as well.

Why does porosity and permeability matter?

Porosity is great for telling us how much water the soil or sediment can hold, but it’s also important to know how that water can move through those spaces underground. For this we use a term called permeability, which describes how easily water flows.

What factors affect permeability?

Factors affecting Soil Permeability

• Factors affecting permeability include Particle size, Void ratio, Permeant, Shape of particles, Degree of saturation, soil fabric, Impurities in water and Adsorbed cation on clay mineral surface.
• Permeability is the ease with which the water can flow through soil.

Why is porosity and permeability important?

The porosity and permeability of rocks is important in determining which rocks will make a good reservoir. A rock that is both porous and permeable would make a good reservoir rock as it allows oil and gas to move up through the pores in the rock closer to the surface where it can be extracted.

What affects porosity and permeability?

Porosity and permeability are related properties of any rock or loose sediment. Both are related to the number, size, and connections of openings in the rock. More specifically, porosity of a rock is a measure of its ability to hold a fluid.

What is permeability discuss the factors influence permeability?

The factors that affect the coefficient of permeability for a given soil are particle size distribu- tion (grading curve), void ratio, level of saturation, soil structure, and soil imperfections or discontinu- ities [1, 2, 3, 4]. The coefficient of permeability increases significantly with increase in the void ratio.

How does porosity and permeability affect groundwater?

Porosity ultimately affects the amount of water a particular rock type can hold and depends on a couple of different factors. The ability of the ground water to pass through the pore spaces in the rock is described as the rock’s permeability. Permeable layers of rock that store and transport water are called aquifers.

How do porosity and permeability differ?

What is the relationship between permeability and viscosity?

6. What is the relationship between permeability and viscosity of water? It is found that permeability is directly proportional to the unit weight of water and inversely proportional to its viscosity.