A column carrying a load of (750 +77) KN, has to be supported by a square footing with its base at 1.5m depth. What is the required size of footing which will provide a of 3 against shear failure? C= 10 kN/m, 4= 30, d. 17 kN/m. Water table is at greater depth. Assume general shear failure for $-30, N = 37.2, N = 225, Ny = 19.7.