# Hydraulic conductivity in soil

1. May 3, 2017

### fonseh

1. The problem statement, all variables and given/known data
why there's no horizontal conductivity in this question ?

2. Relevant equations

3. The attempt at a solution
IMO , there's also horizontal conducitivity in this question because of the water can also flow horizontally across layer A , B and also C .

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2. May 4, 2017

### Staff: Mentor

What do you think the k's are?

3. May 6, 2017

### fonseh

coefficient of permeability

4. May 6, 2017

### Staff: Mentor

No. They are the hydraulic conductivites. Do you know the definition of hydraulic conductivity?

5. May 29, 2017

### fonseh

i
it is to measure the permeability . Why there's no horizontal hydraulic conductivity in the example above ?

6. May 29, 2017

### Staff: Mentor

Because the flow is vertical, and the pressure is constant over all horizontal planes.

7. May 29, 2017

### fonseh

do you mean the water cant flow horizontally thru different layer ? so there is no horizontal permeability ? Why ?

8. May 30, 2017

### Staff: Mentor

There is horizontal permeability, but the flow is in the vertical direction (according to the problem description).

9. May 30, 2017

### fonseh

Can you point out whoich part of the problem stated the flow is vertical ? The water can also flow in horizontal direction across different layer of soil A, B and C , right ?

10. May 30, 2017

### Staff: Mentor

This is not the way I remember the problem. Maybe I'm thinking of a different problem. In this problem, the flow is purely horizontal, with no vertical component.

11. May 30, 2017

### fonseh

Do you mean it's vertical flow? Not horizontal flow ?

12. May 30, 2017

### Staff: Mentor

No. In the picture in the first post, the flow is horizontal.

13. May 31, 2017

### fonseh

Since the flow is horizontal , why there's no horizontal permeability ?

14. May 31, 2017

### fonseh

Can you point out which part show that the flow is horizontal ?

15. May 31, 2017

### Staff: Mentor

The three layers in the figure are inside a tube which is obviously horizontal.

16. May 31, 2017

### Staff: Mentor

The problem statement says that the tabulated values of hydraulic conductivity are in the direction of flow.

17. May 31, 2017

### fonseh

why ? The water can flow both horizontally and vertically . Why there's only vertical permeability ?

18. May 31, 2017

### fonseh

Previously , you pointed out that the flow is horizontal , if so , why there's no horizontal permeability in this question ?

19. May 31, 2017

### Staff: Mentor

You are aware of the relationship between the permeability and the hydraulic conductivity, correct?

20. May 31, 2017

### fonseh

yes, can you explain further ?