seepage

seep +‎ -age

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seepage (countable and uncountable, plural seepages)

1. The process by which something, especially a liquid, leaks through a porous substance; the process of seeping. (Also used figuratively: the process of diffusing.)
   • 1922, S.A.E. Journal, page 262:

     […] while they all admit that the most serious losses occur by seepage of gas from, and oil into, the combustion-chamber and that this seepage is  […]

   • 1972, Rio Blanco Gas Stimulation Project: Environmental Impact Statement, page 42:

     In the case of the Rio Blanco experiment, it is the seepage of gas which is considered to be the "worst possible situation" that might occur.

   • 2014, Joe Nickell, Adventures in Paranormal Investigation, University Press of Kentucky, →ISBN:

     Despite some seepage of customs from north of the border, the Day of the Dead is not [widespread in the US].

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

• antiseepage
• microseepage
• seepage bed