# 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](https://en.wikipedia.org/wiki/Time_of_concentration) | ## [[Philosophy of time]] ## [[Date & Time]] ## Inbox - [[Eternity]] - [[Aeon]]