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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.
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
2 Μαΐ 2016 · Technical Release 55 (TR-55) Urban Hydrology for Small Watersheds was first issued in January 1975 as a simplified procedure to calculate the storm runoff volume, peak rate of discharge, hydrographs and storage volumes required for storm water management structures (SCS, 1975).
Now Natural Resources Conservation Service (NRCS) "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.
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The document outlines methods for estimating runoff using runoff curve numbers, calculating time of concentration and travel time, determining peak discharges graphically or from tables, developing hydrographs, and estimating storage volumes for detention basins.
TR-55 Methodology: Sub-area/Reach Concepts “Reaches” represent the configuration of flow paths within the watershed. Storage routing (Lakes, Structures, Wetlands, etc.) and Channel Routing take place within a Reach. All WinTR-55 modeled watersheds end with the final stream reach terminating at an “Outlet” Schematic Example Sub-area 2 ...
