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# Hydraulic Conductivity (Coefficient of Permeability) Formulas

## Hydraulic Conductivity (Coefficient of Permeability) Formulas

(OP)
How many formulas that exist to find the hydraulic conductivity value in falling head test? Especially if we do the permeability test on recompacted soil.
Thank you.

### RE: Hydraulic Conductivity (Coefficient of Permeability) Formulas

What do you need the permeability values for?

### RE: Hydraulic Conductivity (Coefficient of Permeability) Formulas

(OP)
@jmcc3265 I need the permeability value for landfill design. I tested few samples mix between clay to get the lowest coefficient value, then I came across that there are some different formula to determined the k value.

### RE: Hydraulic Conductivity (Coefficient of Permeability) Formulas

We perform remolded falling-head tests in the Florida panhandle for retention pond design. We encounter primarily poorly graded fine sands [SP, SP-SM] in our area. We use the formula: k=2.303(aL/At) 〖log〗_10 (h_1/h_2)

Remolded samples, in my opinion, are not real accurate. I sometimes push tubes to perform permeability testing on; however, it is difficult to obtain an 'undisturbed' sample of sandy material.

You can also find relationships for hydraulic conductivity for cohesive and granular soils in most geotechnical textbooks. These relationships use void ratio, and grain size and gradation to estimate the hydraulic conductivity. I would not use these for design though.

### RE: Hydraulic Conductivity (Coefficient of Permeability) Formulas

(OP)
Thanks guys!

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