time of concentration

time of concentration

In a storm-water drainage system, the time required for storm water to travel from the most remote portion of the tributary area to an inlet or drain.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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Parsel in A construction of structures was done to increase the time of concentration rate of 11% and the proper implementation of biological operations to the extent of 50% of the maintenance factor increases in the activities of the two type of basin irrigation caused reduction the amount of significant flood around 30% percent.
The rate of rainfall as measured by the time of concentration is reduced by the time required to fill a basin or tank.
In New York City, the 5-year design storm has an intensity of 5.95 inches per hour (I) based upon a 6-minute time of concentration. For a building with a 30,000-square-foot roof, the flow rate (Q) would be Q = CIA, where C is the runoff coefficient (for a roof assumed at 1), I is the rainfall intensity, and A is the area in acres (30,000 square feet/43,560 square feet per acre).
Therefore, the new time of concentration for the rainfall event would be 6 +16 for the travel time from the roof to the tank, or 22+ minutes total.
The author's sympathies lie with those who brought internment into the spotlight as a disgraceful time of concentration camps and government abuse rather than a time when a "model minority" displayed patience and loyalty and "proved" itself.
Assuming that the time of precipitation is equal to the time of concentration and the watershed lag time equivalent to 0.6 times the time of concentration (SCS, 1973), it follows that time to peak discharge is equivalent to 1.1 times the time of concentration, where time of concentration is defined as the time of flow for the most remote point of the watershed to the outlet (the time required for the entire watershed to contribute).
Peak discharge can be computed once the time of concentration is estimated.
Hydraulic length, watershed slope, and curve number are all parameters used to calculate the watershed time of concentration (Equation 1).
The first step is to collect the required information needed to develop a design hydrograph, which is a time of concentration, [t.sub.c], and a peak flow rate, [q.sub.p].
A design hydrograph was developed from a calculated time of concentration and expected peak flow rate.
The most important effects of these structures are channel slope stabilization, increasing the time of concentration, reducing flood rates and controlling sediments[5].