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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....
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.
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.
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 TR-20 rewrite involves a system of programs including not only a new watershed scale surface water hydrology model with expanded features but also a data converter for old input data, a HEC-RAS cross section reformatter, an input editor, a graphical post processor and eventually a Geographic Information System (GIS) based input generator.
A key phase in the design of bridge openings, culverts, and other hydraulic structures involves the use of physically based hydrologic models to compute the discharges in terms of the land use, soil and typography of the watershed above the drainage facility. Physically based models generally provide good estimates of flow rates when the landbased input parameters are correctly defined. Such ...
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...
