Coefficient Of Permeability Calculator


The coefficient of permeability, often denoted as ‘k’, is a crucial parameter in soil mechanics, geotechnical engineering, and hydrogeology. It quantifies the ability of a soil or rock to transmit water when subjected to a hydraulic gradient. Accurate determination of this coefficient is essential for the design and analysis of groundwater flow and related projects.

How to Use

To use the coefficient of permeability calculator, simply input the required values for the hydraulic gradient, cross-sectional area, and discharge rate. Once the values are entered, click the “Calculate” button to get the coefficient of permeability.


The coefficient of permeability (k) can be calculated using the following formula:


  • k = Coefficient of permeability
  • Q = Discharge rate (volume of water flow per unit time)
  • L = Length of the soil sample
  • A = Cross-sectional area of the soil sample
  • h = Hydraulic head difference

Example Solve

Let’s consider an example where:

  • Discharge rate (Q) = 0.02 m³/s
  • Length of the soil sample (L) = 1 m
  • Cross-sectional area (A) = 0.1 m²
  • Hydraulic head difference (h) = 2 m

Using the formula:

Therefore, the coefficient of permeability is 0.1 m/s.


What is the coefficient of permeability?
The coefficient of permeability is a measure of how easily a fluid can pass through a porous material.

Why is the coefficient of permeability important?
It is important for designing and analyzing systems involving groundwater flow, such as drainage systems and soil stabilization projects.

What factors affect the coefficient of permeability?
Factors include soil type, porosity, grain size, and the viscosity of the fluid passing through.

How is the coefficient of permeability measured in the field?
It can be measured using various methods such as pump tests, slug tests, and permeameter tests.


The coefficient of permeability is a fundamental parameter in various engineering and environmental applications. Using the provided formula and calculator, you can accurately determine this coefficient for your specific needs.

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