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catchwater drain

British  
/ ˈkætʃˌwɔːtə /

noun

  1. a channel cut along the edge of high ground to catch surface water from it and divert it away from low-lying ground

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

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