Exercise 3
Groundwater is pumped from the two confined aquifers shown in Figure Exercise 3‑1. After 1 year, a cumulative land subsidence equal to 0.1 m is measured at the land surface. The piezometric drawdown recorded at the same time in aquifer 1 and aquifer 2 amounts to 20 m and 15 m, respectively. Assuming a steady state pressure in the intervening aquitard, and the following ratios between the layer compressibility cb,aquifer1 = 2 cb,aquifer2 and cb,aquifer1 = 0.1 cb,aquitard, compute the compressibility of the three soil layers.
Figure 3‑1 ‑ Sketch of exercise 3.
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