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

Field Permeability Testing

Field Permeability Testing

Field Permeability Testing

What method would be the simplest to measure hydraulic conductivity in a borehole provided the following information.
About 45-ft of residual soil over rock (Southeastern US, Piedmont). I am interested in the zone just above rock; where backward erosion piping has
been observed exiting a slope. I would guess this zone (where material is moving) ranges from a few inches to several feet in thickness.


RE: Field Permeability Testing

Flow nets are required to evaluate piping. The concept of critical gradient has no bearing on permeability. Just not sure what you are striving to determine?


ípapß gordo ainÆt no madre flaca!

RE: Field Permeability Testing


Appreciate your feedback fattdad.

The intent is to evaluate backwards erosion piping. Permeability is of importance when using methods of Hoffman (2012), Sellmeijer (2011), and Schmertmann (2000). I'm interested in the critical gradient for the progression of piping. The zone of interest is rather complex, and is believed to vary from soil to rock. Judging from the observed pipes, we think the piping is occurring within a soil layer having a rock roof just above it a few inches to a few feet thick and more competent bedrock below.

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


Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now
The Great Project Profitability Debate
A/E firms have a great opportunity to lead the world into the future, but the industry’s greatest asset—real-time data—is sitting wasted in clunky, archaic ERP platforms. Learn how real-time, fully interactive dashboards in a modern ERP allow you to unlock data that will shape the future of the world. 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