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In a falling head permeability test. The length and area of the cross-section of soil specimen

are 0.17m and 21.8 * 10−4m2 respectively..Calculate the time required for dad to drop from 0.25m to 0.10m. The area of cross section of stand pipe is 2104m2. The sample has three layers with permeability 3105m/s for first 0.06m. 4105m/s for second 0.06m and 6105m/s for the third 0.05m thickness.Assume the floor is taking place perpendicular to the bedding plane.

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Kv=HH1K1+H2K2+H3K3 Kv=0.170.063×105+0.064×105+0.056×105 kv=3.92×105 Kv=2.303aLAtlog10h1h2 t=364.63sec

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