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Technical Release 55 (TR-55) presents simplified procedures for estimating runoff and peak discharges in small watersheds. In selecting the appropriate procedure, consider the scope and complexity of the problem, the available data, and the acceptable level of error. While this TR gives special emphasis to urban
Runoff Hydrograph - TR-55 Tabular Method. The TR-55 Tabular Method approximates TR-20, which is a more detailed hydrograph procedure. This method can develop partial composite runoff hydrographs at any point in a watershed by dividing the watershed into homogeneous subareas.
Hydrograph Method. This chapter presents the Tabular Hydrograph method of computing peak discharges from rural and urban areas, using time of concentration (Tc) and travel time (Tt) from a subarea as inputs. This method approxi-mates TR-20, a more detailed hydrograph procedure (SCS 1983).
A method for determining a modified CN for determination of peak discharge rate for the WQv design storm (1.25 inches) is presented in Chapter 3 - Section 6 Small Storm Hydrology. This method allows the use of WinTR-55 for analysis of the WQv storm. Source: NRCS, 2003.
This report is commonly known as TR-55. The tables provide estimates of the curve number (CN) as a function of hydrologic soil group (HSG), cover type, treatment, hydrologic condition,...
Technical Release 55 (TR-55) presents simplified procedures to calculate storm runoff volume, peak rate of discharge, hydrographs, and storage volumes required for floodwater reservoirs. These procedures are applicable in small watersheds, especially urbanizing watersheds, in the United States.
In most cases, the designer will NRCS methods to develop the base use the hydrology (CN, Tc, graphical peak discharge q. p], etc.[), and use that data in one of the numerous hydrologic/hydraulic computer models (including TR-55, TR-20, HEC 1, etc.).
