catchment area vs gully

catchment area

noun
  • An area from which water drains into a particular lake, river, etc.; the catchment area of a large river includes its tributaries. 

  • The area served by a local institution, such as a hospital or school, or by extension, a railway station. 

gully

noun
  • A trench, ravine or narrow channel which was worn by water flow, especially on a hillside. 

  • A road drain. 

  • A small valley. 

  • A fielding position on the off side about 30 degrees behind square, between the slips and point; a fielder in such a position 

  • A grooved iron rail or tram plate. 

  • A large knife. 

  • A drop kerb. 

  • an alleyway or side street. 

verb
  • To wear away into a gully or gullies. 

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