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Time (concept)

Time of concentration is a concept used in hydrology to measure the response of a watershed to a rain event. It is defined as the time needed for water to flow from the most remote point in a watershed to the watershed outlet. It is a function of the topography, geology, and land use within the watershed. A number of methods can be used to calculate time of concentration, including the Kirpich (1940) and NRCS (1997) methods.
wikipedia:: Time of concentration

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Time (concept)
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Time (concept)
Philosophy of time
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