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4.1.2 Two confined aquifers are separated by an aquitard as shown below. The piezometric head difference between the upper and lower aquifer measured along a vertical line is 6.5 m. If the verti- cal hydraulic conductivity of confining unit is 0.046 m/day, deter- mine the direction and magnitude of leakage per km2 between the upper and lower confined aquifers through the confining unit. Also, estimate the travel time of a water particle through the con- fining layer between the two aquifers. Estimated thickness of the separation is 4.15 m. n-Ul Confining layer 6.5 m Upper aquifer Confini 4.15 m Lower aquifer

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