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TR-20: Project Formulation - Hydrology. Author: USDA Soil Conservation Service (SCS) Now Natural Resources Conservation Service (NRCS) "The TR-20 program provides a hydrologic analyses of a watershed under present conditions.... Output consists of peaks and/or flood hydrographs....
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TR-20 is a computer program for the simulation of runoff occurring from a single storm event. The program develops flood hydrographs from runoff and routes the flow through stream channels and reservoirs.
If you are using SCS Unit hydrograph method with SCS loss method, the results should match closely with TR-20 hydrology. TR-20 represents the full-bore implementation of these methods, whereas TR-55 is a more simplified version that lent itself more to hand calculations.
The Soil Conservation Service (SCS) has two watershed computer models that can be used in urban hydrology design: Computer Program for Project Formulation-Hydrology (TR-20) (1) and Urban Hydrology for Small Watersheds (TR-55) (2). The TR-20 computer program was developed in 1965 and has been modified several times since then.
HydroCAD combines the most-used capabilities of TR-20 and TR-55, plus many other techniques and features not provided by either program. We also have a step-by-step guide for comparing the results from these programs. Extensive rainfall library, user-defined storms, & synthetic rainfall distributions generated from local precipitation frequency ...
Runoff Hydrograph - SCS Method. This function applies the SCS hydrograph procedure and the same methodology as used in TR-20 to generate runoff hydrograph by specifying either a triangular hydrograph shape or a curvilinear one. There are five unit hydrograph options: Delmarva, SCS Curvilinear, SCS Triangular, Clark and Snyder unit hydrograph ...
