Two confined aquifers are separated by an aquitard as shown in the diagram. The piezometric head difference between the upper and lower aquifer measured along a vertical line is 6.5 m. If the vertical hydraulic conductivity of confining unit is 0.046 m/day. Determine the direction and magnitude of leakage per km2 between the upper and lower confined aquifers through the confining unit. Estimated thickness of the separation is 4.15m.