drainage system(redirected from Annular drainage)
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Rivers, streams, and other inland water features.
Dictionary of Military and Associated Terms. US Department of Defense 2005.
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|Noun||1.||drainage system - a system of watercourses or drains for carrying off excess water|
system - instrumentality that combines interrelated interacting artifacts designed to work as a coherent entity; "he bought a new stereo system"; "the system consists of a motor and a small computer"
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