   Chapter 7, Problem 7.10P Principles of Geotechnical Enginee...

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

Solutions

Chapter
Section Principles of Geotechnical Enginee...

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

Figure 7.32 shows the cross section of a levee which is 650 m long and is underlain by a 2.5-m-thick permeable sand layer. It was observed that the quantity of water flowing through the sand layer into the collection ditch is 13.5 m3/hr. What is the hydraulic conductivity of the sand layer? Figure 7.32

To determine

Find the hydraulic conductivity of the sand layer.

Explanation

Given information:

The length of levee l is 650 m.

The length of the seepage path L is 210 m.

The thickness of permeable sand layer t is 2.5 m.

The quantity of water flowing through the sand layer into the collection ditch q is 13.5m3/hr.

Calculation:

Determine the hydraulic gradient using the relation.

i=ΔhL

Substitute (175–158) m for Δh and 210 m for L.

i=(175158)210=0.081

Determine the hydraulic conductivity of the sand layer using the relation

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