The finite-element program FEMFLOW3D consists of the main program, a simple driver, and a set of subroutines which perform model calculations. The source code for the program is written in the ANSI x3.9-1978 FORTRAN standard. Two compiler specifications must be included when compiling the source code: (1) The compiler must accept "ENTRY" statements that have a different argument list than the argument list for the main subroutine call, and (2) the internal variables within the subroutines must be saved.