# Question: the predicted average reduction in hydraulic head h in an...

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The predicted average reduction in hydraulic head, h, in an aquitard overlying an aquifer is 5 mafter the aquifer is developed for a water supply. A laboratory test on a sample of the aquitard material yielded a vertical compressibility, , of 5.0 x 10-7 Pa-1 . The aquitard is 50 m thick.

Calculate: a. The maximum possible landsubsidence.

b. If the areal extent of the head drop is 5 km2 , estimate the volume of water that willhave leaked from the aquitard into the aquifer.