What is another word for open drain?
Pronunciation: [ˈə͡ʊpən dɹˈe͡ɪn] (IPA) 
The term "open drain" refers to an unenclosed water channel or ditch. Synonyms for open drain include open channel, watercourse, gully, culvert, trench, canal, and conduit. An open channel is a commonly used synonym for open drain that suggests a waterway that carries surface or subsurface runoff. A watercourse is a larger body of water that includes rivers and streams. A gully is a narrow trench or ravine formed by surface water erosion. A culvert is a structure that allows water to flow underneath a roadway or railway. Trench refers to a long and narrow excavation in the ground. A canal is an artificial waterway built for navigation, irrigation, or drainage. Lastly, conduit is a term used for underground water pipes or channels.
