Deviations from the classical theory of the barometric efficiency (Jacob 1940) is shown in some examples. A model with a semipermeable bed overlying the aquifer is proposed, and equations for the flow in this model, generated by changes in the total load, for instance changes in air pressure, are presented. Solutions are given for specified variations in the total load, and some data from nature are compared with one of these solutions. The data presented are from the archives of the Geological Survey of Denmark, Hydrogeological Department (DGU, HA).

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