Since 1989, NCCHE has been supported by the USDA Agricultural Research Service by means of funds appropriated by the U.S. Congress, with a mandate to develop state-of-the-art numerical models for simulating flow and sedimentation processes in the natural environment. Since then a suite of 1D, 2D and 3D computer models have been developed, verified, refined, validated, documented and applied to simulate a variety of free surface flow and sediment transport-related phenomena.

Versions of the CCHE1D, CCHE2D (32-bit with GUI) and Mesh Generator software packages are available for download. The software is available for testing and use free of charge.  Please be aware that, due to limited resources at NCCHE, these versions are no longer supported.

The latest NCCHE models are all 64-bit and modularized:



They can also be used at no cost through collaborative research with NCCHE. Test models with limitations can be downloaded from this site.

Special note regarding CCHE2D and CCHE3D:  For many years, CCHE2D has been made available to the public free of charge. During this time, thousands of users have downloaded and applied this basic model for free surface flows and sediment transport studies. We are pleased that this model has benefited the research, development and engineering applications of so many. Going forward, this free basic model will no longer be supported, due to the high costs associated with its development, maintenance and support obligations.

In order to promote and sustain technology development and transfer, CCHE2D has recently been copyrighted by the University of the Mississippi. It is available commercially from this point on. The full version of CCHE2D has been further refined, updated, and made more capable (flood, sediment transport, cohesive sediment transport, pollutant transport, bank erosion, water quality, coastal storm surge, coastal waves, in-stream structures, etc.) and it is fully supported. Additionally, CCHE3D, a three-dimensional model for free surface turbulent flow and sediment transport modeling, has also been developed for commercial use. Trial versions of both of these models, as well as details on the availability and pricing for the models and modules, can be found at:

U.S. Federal agencies and national or international institutions that have supported the development of these models will still have access to the commercial versions for free or according to specific agreements. For more information, please contact us via email at or