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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.
This research project aimed to assess the suitability of TR-55 in the Whangarei District. In particular, assessing where the primary local soil types f all into the method ’s hydrologic soil groups and reviewing the Type IA rainfall distribution against known rainfall events.
14 Αυγ 2014 · TR55 - Urban Hydrology for Small Watersheds Tutorial • This tutorial demonstrates the new TR55 model. You will learn how to: • Create an Input File • Run TR55 • View Output. Minimum Data Requirements • Data required for a single sub-area run can be entered on the TR-55 Main Window.
The following example outlines the hydrographic information needs and how they can be determined using WinTR-55 for a small urban area, in case, a construction site. There are a number of situations where WinTR-55 (or TR-55) can be used to advantage when evaluating construction sites, including the design of erosion and sediment controls.
Hydrology for Small Watersheds (TR-55). The needed revisions to TR-20 do not directly affect its application in urban areas, whereas the proposed revisions to TR-55 could affect the peak discharges. The primary change is in the velocity method for computing time of concentration, which deals with the sheet flow and concentrated flow.
Travel time ( Tt ) is the time it takes water to travel from one location to another in a watershed. Tt is a component of time of concentration ( Tc ), which is the time for runoff to travel from the hydraulically most distant point of the watershed to a point of interest within the watershed.
