culvert vs ditch

culvert

verb
  • To channel (a stream of water) through a culvert. 

noun
  • A channel crossing under a road or railway for the draining of water. 

ditch

verb
  • To dig ditches. 

  • To dig ditches around. 

  • To throw into a ditch. 

  • To discard or abandon. 

  • To deliberately not attend classes; to play hookey. 

  • To deliberately crash-land an airplane on water. 

noun
  • A trench; a long, shallow indentation, as for irrigation or drainage. 

  • A raised bank of earth and the hedgerow on top. 

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