The permeability function is expressed in terms of the incomplete Beta function ratio whose value may be conveniently found in some mathematical tables. Further, a general pore-sized distribution function of soils has been obtained from the retention function. The derivation of the pore-size distribution function enables more rigorous examination and further exploration of the theories concerning water movement in partially saturated soils. The program runs in batch mode. It requires an input file which can be prepared with a text editor.
Output is a text file with tabular results.
FP is a public domain, DOS-based program distributed complete with source code, executable image, and an example data set. The documentation consists of installation instructions, a description of the theory and computer code, and an example application.