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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 $2*10^{-4}m^2$. The sample has three layers with permeability $3*10^{-5}$m/s for first 0.06m. $4*10^{-5}$m/s for second 0.06m and $6*10^{-5}$m/s for the third 0.05m thickness.Assume the floor is taking place perpendicular to the bedding plane.