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A level site consists of a deep deposit of sand having a total density of 1.7t/m3...

A level site consists of a deep deposit of sand having a total density of 1.7t/m3 . The water table is 2 m below the surface of the sand. During a period of wet weather the site is flooded such that 2m of water covers the site. Determine the change in vertical effective stress at a point 4m below the surface of the sand as a result of this flooding.
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