A layer of soil profile in a tank with downward seepage is shown in Figure Q4 (a). Calculate the total stress, pure water pressure and effective stress at points A, B and C. Hence, plot the variations of the stresses with depth. Given: H_1 = 2.5 m, H_2 = 6.7 m, h = 4.1 m, z = 3.4 m, e = 0.64, and G_s = 2.71