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How to get a copy: You can download the software and documentation from the NRCS Tech Tools. How it compares to HydroCAD: HydroCAD is widely used for projects that might otherwise have been performed with TR-20. HydroCAD provides several key features of TR-20, such as the unit-hydrograph runoff procedure, in a more user-friendly graphical format.
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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.
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. Note: This table reflects the earlier DOS versions of TR-20 and TR-55.
HydroCAD is ideal for studies using the TR-20, TR-55, or SBUH methods. (Please visit the Hydrology Library for background information.) HydroCAD provides a wide range of standard hydrology and hydraulics techniques in an easy-to-use graphical form, managed by the on-screen routing diagram we pioneered in 1986.
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.
