In a falling-head permeability test, the time taken for the head to fall from 27 cm to 3 cm is 10 minutes; if the test is repeated with the same initial head, i.e., 27 cm, what time would it take for the head to fall to 9 cm? (a) 3 minutes (b) 5 minutes (c) 6 minutes (d) 7.5 minutes

In a falling-head permeability test, the time taken for the head to fall from 27 cm to 3 cm is 10 minutes; if the test is repeated with the same initial head, i.e., 27 cm, what time would it take for the head to fall to 9 cm? (a) 3 minutes (b) 5 minutes (c) 6 minutes (d) 7.5 minutes

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter7: Permeability

Section: Chapter Questions

Problem 7.22P: Refer to Figure 7.24. The following data were collected during the field permeability measurement of...

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Concept explainers

Laboratory Determination of Hydraulic Conductivity

Hydraulic conductivity is the measure of flowability of water inside the soil in the presence of a hydraulic gradient. The hydraulic gradient is defined as the difference in the water heads in the soil, which induces a water motion. In simple terms, a hydraulic gradient is the presence of a potential that induces a flow of water.

Question

In a falling-head permeability test, the time taken
for the head to fall from 27 cm to 3 cm is
10 minutes; if the test is repeated with the same
initial head, i.e., 27 cm, what time would it take
for the head to fall to 9 cm?
(a) 3 minutes
(c) 6 minutes
(b) 5 minutes
(d) 7.5 minutes

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