×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Are you an
Engineering professional?
Join Eng-Tips Forums!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

# Estimating hydraulic conductivity in soil with a rectangular holes

## Estimating hydraulic conductivity in soil with a rectangular holes

(OP)
Dear all,

I'm facing the problem of estimating the permeability or hydraulic conductivity of a gravelly soil with field "experiments" that are not standard. The experiments were as follow:
The watertable was 20 cm below the terrain
A rectangular hole was dug, with a depth of 1.4 m, and an area of 3.5m x 4.0m, roughly 17 m3 in volume below watertable.
The hole was drained with pumps and then it took 4 hrs to fill back with water.
No other data is given.

Is there an easy way of estimating the hydraulic conductivity of the soil with this data? I can't figure out how to find the hydraulic gradient and do the math.

### RE: Estimating hydraulic conductivity in soil with a rectangular holes

take the square hole and determine it's area.
using that area, solve A=pi(r^2), which will return some equivalent value for,"r."

Use that value in the slug test equation, which uses the rate of recovery, the radius of the well (i.e., the equivalent radius you just calculated) and other such boundary conditions.

Don't worry about the practical matters of a square is not a circle! It's all within the practical limits of our practice.

In all honesty, I'da used the dewatering rate under constant drawdown to solve the well yield equations.

May find some value in the document, "Dewatering and Groundwater Control" (NAVFAC P-418, 1983).

f-d

ípapß gordo ainÆt no madre flaca!

#### 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.

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!