Abstract
A digital computer model is presented that simulates the response of an unconfined aquifer to changes in stream stage. The aquifer is considered to be finite, homogeneous, and isotropic. The stream is considered to have semipervious banks. The hydraulic conductivity of the semipervious layer of the streambed is assumed smaller than that of the aquifer, and the storage capacity of the semipervious layer is assumed insignificant. Numerical solutions describing the water level fluctuation in the aquifer due to an arbitrarily varying flood pulse in the stream are obtained by a predictor-corrector scheme with a nonuniform grid spacing. The numerical scheme is unconditionally stable.
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