Abstract
Available expressions which describe the water-table fluctuation in a stream-aquifer system are based primarily on the assumption that the bed of the stream is as permeable as the aquifer it completely cuts through. Analytical expressions are developed, in terms of the head averaged over the depth of saturation, which take into account the semiperviousness of the streambed. The situations considered are finite and semi-infinite aquifer systems in which the water level in the semipervious stream is suddenly lowered below its initial elevation, and suddenly raised above its initial elevation, and maintained constant thereafter. As a by-product, solutions are also obtained for finite and semi-infinite aquifer systems in which the bed of the stream is as permeable as the aquifer.
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