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USDA-NRCS Technical Release 55 (TR-55) Hydrology for Small Watersheds model is widely used for stormwater hydrology. This software has been updated to Windows from DOS. Significant enhancements have been included such as: full hydrograph development using TR-20 computational engine, capability to change the rainfall distribution and the dimensionless unit hydrograph, Muskingum-Cunge channel routing, updated reservoir routing procedure, and graphical hydrograph output.

This paper briefly describes these changes and provides an introduction to the WinTR-55 software. The model and documentation can be downloaded from the USDA-NRCS National Water and Climate Center web: http://www.wcc.nrcs.usda.gov/water/quality/hydro/