SESOIL (SEasonal SOIL) is a one-dimensional vertical transport screening-level model for the unsaturated (vadose) zone. It simulates contaminant transport and fate based on diffusion, adsorption, volatilization, biodegradation, and hydrolysis.
SESOIL is a public domain software written in FORTRAN developed in 1981 by the United States Environmental Protection Agency (USEPA), written by Bonazountas and Wagner of the Arthur D. Little corporation.