4.1.2 Two confined aquifers are separated by an aquitard as shown below. The pie

Question

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

Explanation / Answer

we have to find a discharge (Q) from the confining layer

Q=k*(dh)/dl

given k=0.046

dh=6.5

dl=4.15

Q=0.046*6.5/4.15

Q=0.0720m/day

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