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WinTR-20 Watershed Hydrology

The Computer Program for Project Formulation Hydrology (WinTR-20) is a single event watershed scale runoff and routing model. It computes direct runoff and develops hydrographs resulting from any synthetic or natural rainstorm. Developed hydrographs are routed through stream and valley reaches as well as through reservoirs. Hydrographs are combined from tributaries with those on the main stream. Branching flow (diversion), and baseflow can also be accommodated. WinTR-20 may be used to evaluate flooding problems, alternatives for flood control (reservoirs, channel modification, and diversion), and impacts of changing land use on the hydrologic response of watersheds. The NRCS WinTR-20 version 1.11 computer program can be downloaded from this page.

A new routine has been added to the program that allows the user to import NOAA Atlas 14 rainfall data for site-specific applications. The rainfall-frequency data will be used to develop site-specific rainfall distributions. The NOAA 14 text files for selected Eastern states are available in the Support Materials for downloading and use in WinTR-20 Version 1.11. The NOAA 14 text files and supporting GIS files are packaged in a zip file for each state.

The WinTR-20 development team has appreciated all the testing and comments we have received to date. If you encounter any problems, or have comments on the version 1.11 computer program or enhancements to suggest please contact the WinTR-20 development team via e-mail to:   WinTR-20 Team.

Download WinTR-20 installation file

Get download help here.


WinTR-20, Version 1.11, (for Windows7 and earlier operating systems)


WinTR-20 Support Materials         (Other than Readme, these files require Microsoft Word.)

WinTR-20 Readme file
Latest version of the WinTR-20 User Documentation  (3.4 MB)
Latest version of the WinTR-20 User Guide   (6.7 MB)
References on Time of Concentration with Respect to Sheet Flow   (59 kb)
NOAA 14 Data     DE    IN    KY    MD    NC    NJ    OH    SC    TN    WV   

WinTR-20 Training Materials         (These files may require Microsoft Powerpoint, Microsoft Word, or a zip utility.)

Download the WinTR-20 Tutorial (8.42 MB)
Download the latest version tutorial version 1.11 tutorial (20.7 MB)
Download an outline of advanced features advanced features (Microsoft Word)
Download PowerPoint training Presentations
        Module 1: intro & overview (4.9 mb)
        Module 2: basic input & output (5.9 mb)
        Module 3: advanced features (9.3 mb)
        Module 4: computation differences (430 kb)
        Module 5: use for small watersheds (826 kb)
        Module 6: converter (3 mb)
        Module 7: Import of HecRas data (4.1 mb)
        Module 8: Muskingum-Cunge presentation (400 kb)
        Module 9: Import of NOAA Atlas data (7.4 mb)
        Module 9a: NOAA Atlas 14 rainfall distributions (1.3 mb)
        Module 10: NRCS Geo-Hydro introduction (676 kb)
        Module 11: calibration (178 kb)
        Module 12: input parameter sensitivity (1.2 mb)

The Natural Resources Conservation Service used government funds to develop the Technical Release 20 (WinTR-20) computer program. It may be downloaded for use and copying at no additional expense or license requirements.

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