seepage vs soakage

seepage

noun
  • The process by which something, especially a liquid, leaks through a porous substance; the process of seeping. (Also used figuratively: the process of diffusing.) 

  • Water that has seeped or oozed through a porous soil. 

soakage

noun
  • The act of soaking. 

  • A source of water in Australian deserts, where water has seeped into the sand. 

  • food or nonalcoholic beverages consumed before or during a bout of drinking to slow down the onset of drunkenness 

  • The amount of liquid soaked in. 

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