Calculation of Soil Permeability Coefficient Based on Particle Diameter
In literature, you will find simple mathematical solutions for a practical, fast and approximate determination of the soil's water permeability, given a precise knowledge of the geological conditions. These solutions are especially useful for non-cohesive types of soil and they are dependent on the given particle size distribution. The most common formulas are listed below:
Table:
Calculation of soil permeability coefficient based on particle diameter
| 𝑘 = 200 × 𝑑𝑤 × 𝑒2 | 𝑘 = 116 × 𝑑𝑤 | 𝑘 = 𝑓 (𝑑10, 𝑈) |
| Calculation of the permeability coefficient k for loosely bedded, pure filter sand according to [Terza61] | Calculation of the permeability coefficient k for uniform sands according to [Hazen83] | Calculation of the permeability coefficient k according to [Beyer64] (see next page) |
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dw = Effective particle diameter [mm], corresponds to d10
e = Void ratio [-]
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dw = Effective particle diameter [mm], corresponds to d10 |
D10 = Particle diameter at 10 % by weight of the grading curve
U = Coefficient of uniformity
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