A falling head permeability test was carried out on a 15cm long of silty clay. The diameter of the sample and the stand pipe were 9.8cm and 0.75cm respectively. The water level in the stand pipe was observed to fall from 7ocm to 45cm in 12minutes. Determine the coefficient of permeability of the soil in m/day and the height of water level in stand pipe after 20minutes.

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