Conservation Engineering Division Small Watershed Hydrology WinTR–55 User Guide Issued January 2009 The U.S. Department of Agriculture (USDA) prohibits discrimination in all its programs and activities on the basis of race, color, national origin, age, disability, and where applicable, sex, marital status, familial status, parental status, religion, sexual orientation, genetic information, political beliefs, reprisal, or because all or a part of an individual’s income is derived from any public assistance program. (Not all prohibited bases apply to all programs.) Persons with disabilities who require alternative means for communication of program information (Braille, large print, audiotape, etc.) should contact USDA’s TARGET Center at (202) 720-2600 (voice and TDD). To file a com- plaint of discrimination, write to USDA, Director, Office of Civil Rights, 1400 Independence Avenue, S.W., Washington, DC 20250-9410, or call (800) 795- 3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity provider and employer. WinTR–55 User Guide, January 2009 Preface The WinTR–55 Small Watershed Hydrology Computer Program Version 1.00 has been developed to operate within the Windows® operating sys- tem. This guide assists the new or occasional user prepare input and run the program. This version of WinTR–55 is improved over the 1992 version with the fol- lowing features: • inclusion of Windows® interface • use of WinTR–20 for calculations The program and supporting materials may be downloaded from the Web site http://www.wsi.nrcs.usda.gov/products/W2Q/H&H/Tools_Models/ WinTR55.html. The materials available include a Frequently Asked Ques- tions file, a tutorial, and other training material. Acknowledgments Please e-mail any problems to the WinTR–55 development team at [email protected] or contact the NRCS hydraulic engineer in your state. WinTR–55 Small Watershed Hydrology was developed by: Ralph Roberts, U.S. Department of Agriculture, Agricultural Research Service, MD Jolyne Lea, U.S. Department of Agriculture, Natural Resources Conser- vation Service, OR Laurel Foreman, U.S. Department of Agriculture, Natural Resources Conservation Service, IA Helen Fox Moody, U.S. Department of Agriculture, Natural Resources Conservation Service, MD Quan D. Quan, U.S. Department of Agriculture, Natural Resources Con- servation Service, MD William Merkel, U.S. Department of Agriculture, Natural Resources Conservation Service, MD Karl Visser, U.S. Department of Agriculture, Natural Resources Conser- vation Service, TX Claudia Hoeft, U.S. Department of Agriculture, Natural Resources Con- servation Service, Washington, DC Al McNeill, U.S. Department of Agriculture, Natural Resources Conser- vation Service, SC John McClung, U.S. Department of Agriculture, Natural Resources Con- servation Service, AR Tony Funderburk, U.S. Department of Agriculture, Natural Resources Conservation Service, TX Jon Werner, U.S. Department of Agriculture, Natural Resources Conser- vation Service, retired Roger Cronshey, U.S. Department of Agriculture, Natural Resources Conservation Service, retired Don Woodward, U.S. Department of Agriculture, Natural Resources Conservation Service, retired Many volunteer users from the U.S. Department of Agriculture, the Natu- ral Resources Conservation Service, and the private sector provided extensive testing and comments. They helped make this version a much better product. WinTR–55 User Guide, January 2009 i ii WinTR–55 User Guide, January 2009 Small Watershed Hydrology Contents Introduction ................................................................................................................................................... 1 Historical background ......................................................................................................................................................1 Program description .........................................................................................................................................................1 Model overview .................................................................................................................................................................1 Capabilities and limitations ..............................................................................................................................................2 Model input .................................................................................................................................................... 3 Minimum data requirements ............................................................................................................................................3 User responsibility ............................................................................................................................................................3 Watershed sub-areas and reaches ...................................................................................................................................3 Welcome to WinTR–55 window .......................................................................................................................................6 WinTR–55 Main Window ...................................................................................................................................................8 Land Use Details window ...............................................................................................................................................14 Land Use Summary for Sub-area window ....................................................................................................................15 Custom Curve Number window ....................................................................................................................................15 Time of Concentration Details window ........................................................................................................................18 Reach Data window ........................................................................................................................................................20 Reach Flow Path window ...............................................................................................................................................23 Structure Data window ...................................................................................................................................................24 Storm Data window ........................................................................................................................................................30 Custom Rainfall Distribution window ..........................................................................................................................33 Dimensionless Unit Hydrograph window ....................................................................................................................35 Graphics windows ...........................................................................................................................................................35 Running WinTR–55 ....................................................................................................................................... 39 WinTR–55 processes .......................................................................................................................................................39 WinTR–20 processes .......................................................................................................................................................40 Viewing Output ............................................................................................................................................. 41 Output Definition window ..............................................................................................................................................43 Plotting and viewing hydrographs .................................................................................................................................45 Appendix A—Examples Appendix B—Equations Apendix C—References WinTR–55 User Guide, January 2009 iii Tables Table 1 WinTR–55 capabilities and limitations ..............................................................................................................2 Table 2 Sample watershed flows ......................................................................................................................................3 Table 3 WinTR–55 file display .........................................................................................................................................42 Table 4 WinTR–55 reports ........................................................................................................................................................ 44 Figures Figure 1 WinTR–55 system schematic ..............................................................................................................................2 Figure 2 Sample watershed schematic .............................................................................................................................3 Figure 3 Window entry features .........................................................................................................................................4 Figure 4 Additional window entry features ......................................................................................................................5