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Question: a leaky confined aquifer is overlain by an aquitard which...

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Ground Surface Water Table (Unconfined Aquifer) 30 m Unconfined Aquifer Aquitard (or confining unit) 20 m Confined Aquifer 55

A leaky confined aquifer is overlain by an aquitard, which is overlain by an unconfined aquifer. The leakage rate through the aquitard is 0.07 m/year. Knowing that the average piezometric surface of the confined aquifer is on average 15 m below the water table of the unconfined aquifer, what is the vertical hydraulic conductivity of the aquitard? What type of material might the aquitard consist of?

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