GGSD Program Details for CHEMFLOW

CHEMFLOW

Category	Contaminant transport (1D)
Publisher	US Environmental Protection Agency
Platform	DOS
Status	Public domain
Description	CHEMFLOW is a 1D screening level model for simulating water and chemical movement in unsaturated soils. Water movement is modeled using the Richards equation. Chemical transport is modeled by means of the convection-dispersion equation, first-order decay in the liquid and solid phases, zero-order production or decay, and linear equilibrium adsorption. These equations are solved numerically by finite differences. Handles three types of boundary conditions for flow. At the upper boundary, the conditions may be: constant potential, constant flux, mixed type condition, and rainfall. The latter boundary condition is a mixed type with the given flux equal to the rainfall rate and the given head equal to zero. For a finite soil system, the conditions at the lower boundary may be: constant potential, constant flux, or mixed type. Results of the flow model can be displayed in the form of graphs of water content, matric potential, driving force, conductivity, and flux density of water versus distance or time. Graphs of concentration, and flux density of chemical as a function of distance or time can also be displayed. Cumulative fluxes of water and chemical and total mass of chemical in the soil can be displayed as functions of time. It is an expansion and update of the water movement model WATERFLO by Nofziger (1985).
Cost	Free on WWW
Data formats supported	None stated
Supplier in United States of America	International Ground Water Modeling Center
Supplier in United States of America	US Environmental Protection Agency