Question: A falling head permeability test was performed on a sample of clean uniform sand. The initial head was 9 0 0 mm . The final

A falling head permeability test was performed on a sample of clean uniform sand. The initial head was 900mm. The final head was 400mm and it takes 60 seconds for the water level in the standpipe to fall from 0mm^3 to 400mm^3. The sample was of 40mm diameter and had a length of 180mm. Determine the area of standpipe and the coefficient of permeability.

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