This text, with ground water modelling software, is a program for unsteady ground water flow problems in multilayered aquifers (confined, semi-confined, and unconfined aquifers, one to five layers) for IBM-PC compatibles.

INTRODUCTION. MATHEMATICAL MODEL. Governing Equations in Main Aquifer Layers. Governing Equations in Aquitards and the Analytical Solution. Analytical Representation of Leakage Terms. Boundary Conditions. Interpretation for Case Studies. NUMERICAL SOLUTION. The Finite Element Concept. Finite Element Formulation. Step by Step Solution of Ordinary Differential Equations in Time. Computation of the Iterative Solution. USER'S MANUAL. Diskette Instructions. Data Generation Format. Data Input Format. Output Organization and Plot Files. CASE STUDIES. One-Layer, Unconfined Aquifer. Two-Dimensional Mound. Five-Layer System. Model Ground Water Basin. Problem One. Problem Two. Problem Three. Problem Four. REFERENCES. APPENDIX. Error Codes. Input Data Files. Two Dimensional Regional Flow Equations. IDEAL.BAS Computer Code. Definitions of Selected Ground Water Terms. INDEX.