stream tube

   1. A cave passage completely filled, now or in the past, with fastmoving water and whose ceiling and walls normally show scallops [10].
   2. The imaginary space formed between two adjacent streamlines in which flow is constant (assuming steady flow conditions).
   Synonyms: (French.) conduite forcée; (German.) Druckflußrohr; (Greek.) ypóghios síranx; (Italian.) condotta forzata; (Spanish.) tubo ( o conducto) fréatico; (Turkish.) akarsu mecras2.

A Lexicon of Cave and Karst Terminology with Special Reference to Environmental Karst Hydrology. . 2002.

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