CE Board HGE Problem 27.2 (Hydraulics and Geotechnical Engineering) - CE April 2023

a layer of clay 10 m thick is overlain by a 15.2 m thick to ground surface. When the water table is at ground surface level, the saturated unit weight of the sand was determined to be 21.2 kN/m^3 for which its dry unit weight is 18.2 kN/m^3 . the saturated unit weight of the clay is 18.8 kN/m^3 . When the ground water table lowered by 7.6 m, the degree of saturation of the sand above the water table was lowered to 30 %. At the mid-height of the clay.
b. Evaluate the effective pressure, in kPa, after lowering of the water table
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