Aquifer tests are typically interpreted by using an analytical model of aquifer flow ( the most fundamental being the Theis solution ) to match the data observed in the real world, then assuming that the parameters from the idealized model apply to the real-world aquifer.
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In an idealized model, the caloric transported from a hot to a cold body by a frictionless heat engine that lacks of conductive heat flow, driven by a difference of temperature, yielding work, could also be used to transport the caloric back to the hot body by reversing the motion of the engine consuming the same amount of work, a concept subsequently known as thermodynamic reversibility.
