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Computation of travel time and time of concentration. Water moves through a watershed as sheet flow, shallow concentrated flow, open channel flow, or some combination of these. The type that occurs is a function of the conveyance system and is best deter-mined by field inspection. Travel time ( Tt ) is the ratio of flow length to flow velocity:
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
Calculation of time of concentration to the study point. Using the Type II or Type III rainfall distribution, total and excess rainfall amounts are determined. See Figure C3-S5-1 for the geographic boundaries for the different NRCS rainfall distributions.
This command calculates the time of concentration (Tc) by the TR-55 method. Time of concentration is the time required for water to flow from the most distant point in the watershed to the measurement point.
Chapter 15 Time of Concentration 630.1500 Introduction This chapter contains information on the watershed characteristics called travel time, lag, and time of concentration. These watershed characteristics influ-ence the shape and peak of the runoff hydrograph. The National Engineering Handbook, Part 630, Hydrology,
The SCS Method of time of concentration is a valid method to use for either the Rational Method, Modified Rational Method or the SCS Unit Hydrograph Method. Lag Time
Time of Concentration Calculations and Composite CN with TR-55. Compute hydrologic parameters such as sub-basin time of concentration and curve number. Objectives . This tutorial demonstrates how to compute coverage overlay percentages, time of concentration, and curve numbers for sub-basins and how to apply these parameters to a TR-55 model.
