Chapter 8, Problem 8.6P

### Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939

Chapter
Section

### Principles of Geotechnical Enginee...

9th Edition
Braja M. Das + 1 other
ISBN: 9781305970939
Textbook Problem

# Draw a flow net for the weir shown in Figure 8.25. Calculate the rate of seepage under the weir.

To determine

Draw the flow net for the weir and calculate the seepage under the weir.

Explanation

Given information:

The hydraulic conductivity of the permeable soil layer k is 103cm/sec.

The head difference between the upstream and downstream H1 is 10 m.

The height of the water level H2 is 1.5 m.

The depth of permeable layer up to the tip of the hydraulic structure D is 11 m.

The depth of permeable layer D1 is 24 m.

Calculation:

Draw the free body diagram of the flow net for the given values as in Figure 1.

Determine the head difference between the upstream and downstream using the relation.

H=H1H2

Substitute 10 m for H1 and 1.5 m for H2.

H=101.5=8.5m

Determine the seepage loss per meter length of the sheet pile using the relation.

q=kHNfNd

Here, Nf is the number of flow lines and Nd is the number of potential drops

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