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HydroCAD provides several key features of TR-20, such as the unit-hydrograph runoff procedure, in a more user-friendly graphical format. HydroCAD also adds other capabilities that have no equivalent in TR-20, such as time-of-concentration calculations, curve-number lookup, outlet hydraulics, exfiltration calculations, pond storage calculations ...
12 Μαΐ 2001 · A modified Natural Resources Conservation Service (NRCS) TR-20 model, TR-20-RICE, was developed to investigate the storm runoff characteristics of a 385-ha mixed-landuse watershed in Korea.
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.
12 Μαΐ 2001 · Computer Program for Project Formulation: Hydrology (TR-20) Revisited. The rewritten TR-20 model has a more physically based input philosophy than previous versions and is based on the approach in the AnnAGNPS model and most of the maximum number limitations have been removed from the model.
26 Απρ 2012 · The HEC-RAS reformatter can provide the needed stream cross section rating information in the TR-20 input format. The GIS based input generator can be used to develop input from Digital Elevation Models, soils, and land use information data layers.
TR-20 and TR-55 both require the same basic inputs of runoff curve number (CN), time of concentration (Tc), and drainage area (DA) for computation of peak discharge and the volume of runoff for a specific rainfall distribution. TR-20 allows the user to define the rainfall temporal distribution. TR-55 has four design rainfall dis-
HydroCAD, TR-20, TR-55 Comparison. The following table summarizes the technical similarities and differences between these three programs. HydroCAD combines the most-used capabilities of TR-20 and TR-55, plus many other techniques and features not provided by either program.
