TR-55 MODULE

Many TSA TOOLS products include elements of the USDA NRCS Hydrology method known as TR-55.

So as requested by numerous customers, we have now developed the TR-55 Module, which is an efficient and user friendly TR-55 interface.

TR-55 was developed by the USDA NRCS (formerly SCS) and is the most popular hydrology model used in the United States. The USDA NRCS TR-55 Manual is installed onto your computer with the TR-55 Module or may be downloaded here. The NRCS has released two different TR-55 computer programs. The DOS application may be downloaded here. A recently released a free Windows version may be downloaded here. Both NRCS TR-55 programs are free.

So with other TR-55 programs available for free, why a TSA TOOLS TR-55 Module? Two reasons: input efficiency and output quality. The TSA TOOLS Navigator and intuitive spreadsheet interface saves time every time. You know exactly what to do next. And HELP is always a click away. The TSA TOOLS output provides clear input and results - with fully referenced formulae. It is not burdened with too many options. It is a streamlined way to get the results you need - fast. And the output is of highest report quality - and easily reviewed. Compare for yourself:

WIN TR-55 RCN OUTPUT EXAMPLE:

tes TSA TOOLS

Test project

Harford County, Maryland

Sub-Area Land Use and Curve Number Details

Sub-Area Hydrologic Sub-Area Curve

Identifier Land Use Soil Area Number

Group (ac)

--------------------------------------------------------------------------------

1A Open space; grass cover > 75% (good) B 10 61

Paved parking lots, roofs, driveways B 10 98

Total Area / Weighted Curve Number 20 80