Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Hydraulic Conductivity (Coefficient of Permeability) Formulas

Hydraulic Conductivity (Coefficient of Permeability) Formulas

Hydraulic Conductivity (Coefficient of Permeability) Formulas

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

@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

Thanks guys!

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


eBook - Functional Prototyping Using Metal 3D Printing
Functional prototypes are a key step in product development – they give engineers a chance to test new ideas and designs while also revealing how the product will stand up to real-world use. And when it comes to functional prototypes, 3D printing is rewriting the rules of what’s possible. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close