# (c) In a constant head permeability test conducted on amedium silt, the following data was obtainedHead maintained 60 cmDiameter of the permeameter = 10 cmThickness of the soil specimen 10cmDischarge collected in 2-50 min 10c.cIf a falling head test is conducted on the same samplewhat time would be required for the head to fall from60 cm to 30cm in the stand pipe which has across-section area of 1-25 cm2?8

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Asked Nov 26, 2019
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## Expert Answer

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Step 1

given:

Head maintained= 60 cm

Diameter of the permeameter=10 cm

'Thickness of the soil specimen,or the length of sample ,l=10 cm

Discharge collected in 2.50 min =10 cc

If a falling head test is conducted on the same sample

Head falls from h1 = 60cm to h2 = 30cm in the standpipe which has a

cross-section area ,a=25 cm2

Step 2

from the constant head permeability test, we will determine the permeability ,k:

Step 3

now,

, from falling head permeability test for the same sample we will calculate the time, t taken by heads to fall from h1 = 60...

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