Drain 3 : A passage, channel, or pipe on, over, or under the ground for the reception and discharge of stormwater or pollutants, whether continuously or intermittently
Ministry of Business, Innovation and Employment, Glossary of terms and acronyms, Wellington, New Zealand 2010. http://wwwsosh.govt.nz/resources/glossary-u.shtml, (Occupn Hlth and Sfty - Brit) {530}