Calculate the total stress, effective stress, and pore water pressure at points A, B, C. What is the hydraulic gradient for the whole clay layer? If the hydraulic conductivity of the clay layer k = 0.302 x 10-7cm/s, what is the discharge velocity? 20 ft 40 ft 30 ft 40 ft A. . C GWT piezometer Sand Ysa = 90 pcf 30 ft Impervious Clay Yra = 110 pcf Sand Ysa = 90 pcf