An Unsteady Regional Multilayered Aquifer Model for Microcomputers

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Abstract
Groundwater quality and quantity modeling in regional aquifer systems has developed very rapidly within the last twenty years. The new computational methods introduced to this field offer flexible tools to practicing engineers to analyze complex problems that otherwise would have been unfeasible to solve. Recent advances made in microcomputer technology introduce a new phase to this progress since such computational facilities are now readily available to most engineers, and the existing groundwater models can be implemented on these computers for efficient and reliable simulation. The study summarized here is an extension of an earlier steady‐state groundwater Now model developed by the first author. The numerical model discussed here is developed for an IBM‐AT or compatible system with 640K core memory capacity. The FORTRAN code is compiled using the Microsoft version 3.2 FORTUNE Compiler (MS‐FORTRAN Compiler) which runs under version 1.25 of the Microsoft Disk Operating System (MS‐DOS). For fast numeric processing an 8087 coprocessing environment is suggested but such a processor is not necessary for proper execution. The unsteady multilayer aquifer model developed here is verified based on analytical solutions for multilayer aquifers available in the literature. The computer code generated is identified as MUCF1 (Multilayer‐Unsteady‐Groundwater‐Flow) model.

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