Texas Tech University

CapSim 4.2.4

Last Update Date: Apr 11th, 2024

File Downloads:

Setup File for 64 bit*  [Exe File]

Specific Chemical Database Files [RAR File][Zip File]

Batch File Examples [Zip File]

Specific Chemical Database Notes [Word File]

CapSim 4.2 Basic Users Manual [PDF File]

Monte Carlo (MC) Batch File Example [Text File]

CapSim 4.0 Powerpoint [PDF File]

Freundlich Parameters of PAHs and PCBs [Excel File]

Multiple Scenario (MS) Batch File Example [Text File]

Koc and Kdoc Values [Excel File]

General Chemical Database [Excel File]


* Some users might experience issues with CapSim 4.2.4 when using Windows 10. Version 4.2.3 is available [here]. 

Instructional Videos:

Design of a basic cap:


Reasons not to use sediment-water interface concentration as an evaluation point:

Previous Versions

CapSim 4.1

Last update June 8, 2023

Update Note: AC sorption kinetic coefficients for HOC and metals/Optimized simulation algorithms/User-defined significant figures for output values.

CapSim 4.0

Last update December 14, 2022

CapSim 3.8

Last Update Date: January 08, 2021

CapSim 3.7

Last Update Date: March 25, 2019

CapSim 3.6

Last Update Date: June 14, 2018

Update Note:Minor bug fixes, output changes and updates of the quick start manual in response to comments from EPA Region 10 reviewers.

CapSim 3.5

Last Update Date: October 6, 2017

Update Note: Solid mixing process by bioturbation/Average output option/Finite water column boundary

CapSim 3.4

Last Update Date: Jan 8, 2017

Update Note: Update the mixture input window

CapSim 3.3

Last Update Date: Dec 8, 2016

Update Note: Update the kinetic sorption model of Freundlich isotherm sorption and the output interface

CapSim 3.2a

Release Date: Aug 15, 2016

Update Note: Add search function in importing compounds from database and update the calculation of DOC bound contaminants

CapSim 3.2

Release Date: June 28, 2016

Update Note: Enable batch function and update the calculation of DOC bound contaminants

CapSim 3.1

Release Date: Apr 7, 2016

Update Note: Enable multi-species, dynamic sorption and non-linear reactions

CapSim 2.8a

Release Date: Nov 13, 2014

Update Note: Enable modeling the tidal oscillation

CapSim 2.8

Release Date: Oct 3, 2014

Update Note: Correct the error in flux calculation

CapSim 2.7c

Release Date: Aug 1, 2014

Update Note: Correct the potential errors in generatation of output files

CapSim 2.7b

Release Date: June 6, 2014

Update Note: Several running errors are fixed, default directory for log files moved to the user's documents folder

CapSim 2.7a

Release Date: April 11, 2014

Update Note: Database, input and output files are moved in a user-defined directory; a bug in batch file function is fixed

CapSim 2.7

Release Date: April 9, 2014

Update Note: Add 'layer grid size' function, which allows the user to control the grid number of each layer in multiple layer case



Reible Group