landflood vs rill

landflood

noun
  • An overflowing of land by river; an inundation or freshet. 

rill

noun
  • A very small brook; a streamlet; a creek, rivulet. 

verb
  • To trickle, pour, or run like a small stream. 

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