INFIL is a numerical simulation model for solving the problem of ponded transient infiltration into a deep, homogeneous soil. The program is based on a four-term form of the Philip series solution (1957) of a one-dimensional form of the Richards equation. The output includes tabulated values and graphic representation of the soil-hydraulic properties, and the changes in time of the infiltration rate, the cumulative infiltration, and the water content profile at different times. The program, which requires soil property functions in mathematical form, is designed to accommodate four different sets of these functions. They were proposed by Vauclin et al. (1979; four parameters), Brutseart (1966 and 1967; three parameters), Brooks and Corey (1964; two parameters), and van Genuchten (1978, three parameters).

The Basic program, developed after an earlier Fortran version by Vauclin, is menu driven and facilitates interactive data input. The program produces tabular and graphic screen output and an ASCII results file. INFIL is a non-proprietary program developed at IGWMC. It is distributed on a DOS-formatted disk containing source codes and runtime version of both the current Basic program and the earlier Fortran version. The documentation of installation instructions, theory, user's manual, and example problems.

SYSTEM REQUIREMENTS

Intel 80x86 based computer, 640 Kb RAM, DOS 3.1 or higher, math coprocessor, and VGA graphics; the program runs as a DOS application under MS Windows.

Developers: M. Vauclin (France), and A.I. El-Kadi (IGWMC); interface development by P.K.M. van der Heijde (IGWMC).