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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).
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U.S. Department of Agriculture FL-ENG-21F Natural Resources Conservation Service 04/04 TR 55 Worksheet 6B: Detention Basin Storage,
U.S. Department of Agriculture FL-ENG-21C Natural Resources Conservation Service 04/04 Tr 55 Worksheet 4: Graphical Peak Discharge Method
How to get it: You can download the TR-55 Manual here. (2MB PDF format) You can download the complete software and documentation from the NRCS Tech Tools. For additional background information on the TR-55 calculations please see Understanding Hydrology or the "Hydrology" section of the training materials. How it compares to HydroCAD:
