Abstract
The land subsidence and the piezometric drawdown resulting from fluid withdrawal from a confined aquifer system are analyzed. The aquifer material is assumed to behave as a viscoelastic Merchant body, representing both primary and secondary consolidation. The resulting ground-water flow equation is solved for the problem of unsteady radial flow in an extensive confined aquifer of uniform thickness to a single fully penetrating well, pumped at a steady rate of flow. Comparison of the result for the special case of an elastic aquifer with the Theis solution indicates that for most practical situations the obtained solution should yield good results. The parameters of the model which are the hydraulic conductivity, the compressibilities of primary and secondary consolidation, respectively, and the viscosity of the secondary consolidation, can be derived from records of piezometric drawdown and surface compaction.
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