Principles of Geotechnical Enginee...

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



Principles of Geotechnical Enginee...

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

Refer to the cross section of the earth dam shown in Figure 8.18. Calculate the rate of seepage through the dam (q in m3/min/m) using Schaffernak’s solution.


To determine

Find the seepage rate through the dam q, in m3/min/m length using Schaffernak’s solution.


Given information:

The height of the water level H is 25 m.

The height of the earth dam H1 is 30 m.

The length of earth dam top L1 is 5 m.

The hydraulic conductivity of the permeable soil layer k is 3×104m/min.


Refer Figure 8.18 in the textbook.

Determine the value of α using the relation.


Here, V is the vertical distance in the slope and H is the horizontal distance in the slope.

Substitute 1 for V and 2 for H.


Determine the value of Δ using the relation.


Substitute 25 m for H.


Determine the distance d value using the relation.


Substitute 30 m for H1, 5 m for L1, 25 m for H, and 50 m for Δ.


Determine the length L value using the relation.


Substitute 90 m for d, 26

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