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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
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.
Originally released in 1975, TR-55 provides a number of techniques that are useful for modeling small watersheds. Since the initial publication predated the widespread use of computers, TR-55 was designed primarily as a set of manual worksheets.
Chapter 3 - Section 5 NRCS TR-55 Methodology. A. Introduction. The Natural Resource Conservation Service (NRCS) hydrologic method requires basic data similar to the Rational method: drainage area, a runoff factor, time of concentration, and rainfall.
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.
Tc is computed by summing all the travel times for consecutive compo-nents of the drainage conveyance system. Tc influences the shape and peak of the runoff hydrograph. Urbanization usually decreases Tc, thereby increasing the peak discharge.
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.
