(1) To draw of (a liquid) by a gradual process. (2) A buried pipe or other conduit (closed drain) for the conveyance of surplus groundwater. (3) A ditch (open drain) for carrying off surplus surface water or groundwater. (4) A system to control water tables near the ground surface to maintain levels at or below specified depths.
DRAIN
Meaning of DRAIN in English
Environmental engineering English vocabulary. Английский словарь экологического инжиниринга. 2012