| The TR-55 computer model has been revised and completely rewritten. As a windows based program, the input and editing windows are a big improvement over the DOS version. The new WinTR-55 uses the WinTR-20 program as the driving engine for more accurate analysis of the hydrology of the small watershed system being studied. A final version (including programs, sample data, and documentation) is now complete. The NRCS WinTR-55 program can be downloaded from this page.
The WinTR55 development team has appreciated all the testing and comments we have received to date. If you encounter any problems, or have comments or enhancements on the version 1 program please contact the WinTR-55 development team via e-mail to the WinTR-55 Team.
Download WinTR-55
Note: Download links may not work in Google Chrome web browsers.
WinTR-55, Version 1.00.10 (18.5 MB - last updated 2/7/2013) Windows 7 (32 and 64 bit) and Windows 10 Version for 64 bit PCs
Download WinTR-55 DB (updated database) NEW!
WinTR-55, Version 1.00.10 DB (last updated 4/20/2015) Windows 7 for 32 and 64 bit PCs.
Instructions for incorporating updated database into WinTR-55 (using the following zip file)
WinTR-55 folder (zip file)
Assistance with the material on this page may be obtained from the WinTR-55 Support Team at WinTR-55 team.
The Natural Resources Conservation Service used government funds to develop the Technical Release 55 (WinTR-55) computer program. It may be downloaded for use and copying at no additional expense or license requirements.
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