drainpipe vs flume

drainpipe

noun
  • A pipe that is part of a device or appliance for carrying away waste fluid. 

  • A pipe that carries wastewater from a bathtub, shower, sink, etc. 

  • The type of pipe that is used to construct a drainpipe. 

  • A type of form-fitting trousers with highly tapered legs. 

  • A verticle pipe carrying water from the roof gutter down the side of a building; downspout. 

  • A conduit for carrying rainwater or flood water. 

flume

noun
  • An open channel or trough used to direct or divert liquids. 

  • A ravine or gorge, usually one with water running through. 

verb
  • To transport (logs of wood) by floating them along a water-filled channel or trough. 

How often have the words drainpipe and flume occurred in a corpus of books? (source: Google Ngram Viewer )