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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 ...
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.
26 Απρ 2012 · The rewritten TR-20 model has a more physically based input philosophy than previous versions and is based on the approach in the AnnAGNPS (Annualized AGricultural Non-Point Source Pollution) model. Most of the maximum number limitations have been removed from the model as well.
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.
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 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.
Convolution: The Heart of TR-20 The unit hydrograph, when dimensioned, tells us what the runoff will be for a single burst of rainfall. To determine the runoff for the entire storm, we must perform a convolution of the unit hydrograph with the precipitation excess.
