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Se denomina [blank_start]caudal[blank_end] en hidrografía, hidrología y, en general, en geografía física, al volumen de agua que circula por el cauce de un río en un lugar y tiempo determinados. Se refiere fundamentalmente al volumen hidráulico de la [blank_start]escorrentía[blank_end] de una cuenca hidrográfica concentrada en el río principal de la misma