SEVIEW 7.1 Features User's Guide Model Reports Model Evaluation
SESOIL SESOIL Setup Climatic Database Chemical Database Running Reports
Training Denver, CO
September 14, 2015
Grand Junction, CO
September 21, 2015
Fort Collins, CO
September 25, 2015
Support Software Support and Maintenance Contract
Calculators Soil-Water Partitioning Slider Calculator Soil-Water Partitioning and Dilution-Attenuation Factor Slider Calculator
SEVIEW Review July 2008 June 2008 April 2008 February 2008 April 2004 October 2003 September 2003 August 2003 June 2003 February 2001
ESCI ESCI Contact Us
Try it Free Download a Fully Functional Trial Version of SEVIEW
Purchase Purchase


Groundwater Transport and Fate Model

AT123D is a generalized three-dimensional groundwater transport and fate model. AT123D is an acronym for Analytical Transient 1-, 2-, and 3-Dimensional Simulation of Waste Transport in the Aquifer System. It simulates contaminant transport under one-dimensional groundwater flow. Transport and fate processes simulated include advection, dispersion, diffusion, adsorption and biological decay. Contaminant transport can be simulated:

  • Without biological decay, or
  • With biodegradation simulated as a first-order decay process.

Version 7.1 of AT123D can simulate over 1,000 years of contaminant transport and contains a correction to the steady state algorithm.

Establish Site-Specific Cleanup Objectives

AT123D can model the time-dependent contaminant releases from the SESOIL vadose zone model. AT123D was enhanced to simulate up to 1,000 years of contaminant migration when linked to SESOIL. Results can be used to estimate how far a contaminant plume will migrate and can be compared to groundwater standards to evaluate risk at specific locations and times. AT123D is an analytical model. This means that contaminant concentrations are determined independently for each node and there is no need to establish a dense grid network of nodes.


AT123D was developed by G. T. Yeh (1981) at Oak Ridge National Laboratory. Significant modifications to the version included with SEVIEW, were made by John Seymor (1982), Darryl Holman (1984) and Howard Trussell, (1986) of the University of Wisconsin-Madison. An enhanced version of AT123D which can simulate over 1,000 years of contaminant transport was created by R. A. Schneiker at ESCI. This version 7.1 of also includes a correction to the steady-state calculation.

Home | More on SEVIEW | Sample Reports | SESOIL | AT123D | BIOSCREEN | BUSTR-Screen | Technical Support & Maintenance Contract
Run AT123D using BIOSCREEN Data Company Profile | Purchase | Download SEVIEW 7.1

Copyright 2013 ESCI, LLC. All Rights Reserved.