Water from low-permeability sediments and land subsidence
Water from low-permeability sediments and land subsidence The amount of land subsidence or groundwater recovery from compressible confining layers depends upon the specific storage of the strata and the average head change within them. Expressions for the specific storage are obtained from both consolidation theory and conservation principles of compressible flow. Average head changes are identified on a depth-pressure diagram in terms of head changes in adjacent aquifers and are referred to as ''effective-pressure areas.'' The geometry of the effective- pressure area is shown to depend upon the thickness of the compressible strata, the magnitude of artesian pressure, decline, the manner in which the basin is developed, and time. These factors are embodied in equations that quantitatively describe the release of stored water from compressible confining layers resulting from their vertical compression in areas of land subsidence. (22 refs.)
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