Abstract
A computer program has been developed to calculate hydraulic and topographic gradients for two-dimensional surfaces. Flow rates are calculated for saturated and unsaturated conditions based upon application of Darcy's law and the exponential hydraulic conductivity equation. The central difference and Horn methods were incorporated into the program to evaluate the gradient of the total hydraulic head between grid points. The FLOWNET program can be applied to evaluate flow in saturated and unsaturated porous media based upon observed pressure head data. In addition, the program can be used to evaluate slope direction and magnitude from topographic elevation data. Heterogeneity and anisotropy can be incorporated into the analysis by inputting variable saturated hydraulic conductivity and a variable alpha exponent in the exponential hydraulic conductivity function. FLOWNET was developed to analyze flow paths and magnitudes in porous media. Example problems illustrate the applicability of the program for building a better understanding of hydraulic processes. © 1997 Elsevier Science Limited
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