Software - CHEMFLO-2000 | Ground Water and Ecosystems Restoration Research

CHEMFLO-2000
April 2003

Description
System Requirements
Downloads: Installation and Start-Up
Technical Support

CHEMFLO-2000 enables users to simulate water movement and chemical fate and transport in vadose zones. The software could be used to assist regulators, environmental managers, consultants, scientists, and students in understanding unsaturated flow and transport processes. Water movement and chemical transport are modeled using the Richards and the convection-dispersion equations, respectively. The equations are solved numerically using the finite differences approach. CHEMFLO-2000 is an upgraded version of CHEMFLO V1.3 that was released in 1989. In addition to the functions in the previous version, a number of new functions and features were added in CHEMFLO-2000 such as graphic sensitivity analyses and a Java interactive interface to facilitate the simulations of water flow and chemical transport.

The new features in CHEMFLO 2000 include:

Graphical User Interface;
Enhanced graphics;
Capability to perform visual sensitivity analyses;
Improved report generating capability;
Capability to simulate flow in layered soils;
Improved numerical methods.

Features retained from the previous version include:

A focus on interactive use as an educational tool;
Support for non-uniform initial conditions;
Support for boundary conditions that change with time;
Support for a variety of popular models for describing soil properties;
Ability to define and store soil properties for future use.

In general, the CHEMFLO-2000 software package is user friendly. All parameters for implementation of the program could easily be entered through an interactive graphical interface. Users need to know only limited technical terminology, and understand the model's mathematical basis and numerical approach. Simulation results can be output as tables and plots. Different types of tables and plots for the output results are available, where the hydraulic and chemical properties of interest vary with time and space.

Hardware and Software Requirements:

CHEMFLO-2000 is written in Java 2. Therefore it can be used on any computer system supporting Java 2. This includes Windows 95/98/ME/NT/2000/XP, Linux, Solaris, and Mac OS X. The software requires at least 64 MB random access memory with 128 MB or more recommended. A fixed disk with 30 MB space is required to install the Java Runtime Environment. The compiled software and soil data file require less than 1 MB additional disk space. The software is written for a computer with a color monitor supporting at least 800x600 pixel resolution.

Software Installation:

Currently, the EPA version of CHEMFLO-2000 is in the form of a stand-alone Java application. There are three components of the CHEMFLO package. They are the Java software, the CHEMFLO-2000 program, and the user's manual. These are all available for downloading free of charge. Installation instructions are given below for each component.

Java Software:
The CHEMFLO application requires the Java 1.3.1 (or later) runtime environment. If that software is already loaded on the computer to be used, skip the remainder of this section and proceed with step 2. If it is not loaded, download a copy of the runtime environment from http://java.sun.com/javase/ . This is a compressed executable file. After downloading it and saving it in a temporary directory, install it on the computer by running the program. This leads the user through the installation process. Accepting the default values presented by the installation software is suggested.

Note:
Download the CHEMFLO-2000 Software:
The Standalone Application available for downloading from this site underwent Agency peer review. The application is stored in a zip file that is approximately 0.5 MB in size. Save the file in a temporary directory. Extract the files into the Chemflo2000 directory (or another directory of choice). This folder should now contain chemflo.jar, chemflo.bat, and README.TXT.
Download the CHEMFLO-2000 User's Manual (PDF) (78 pp, 818K, About PDF) This step is needed only if a local copy of the manual is needed on the user's computer, or to print a hard copy of it.

*The CHEMFLO-2000 application continues to be upgraded by the developers, and the most current version is available at this link, or can be used from the site:
http://soilphysics.okstate.edu/software/chemflo/ Please note that this version may not be the same as the EPA-reviewed version available from the CSMoS website.

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