From Longman Dictionary of Contemporary Englishseepageseep‧age /ˈsiːpɪdʒ/ noun [countable, uncountable] LIQUIDa gradual flow of liquid or gas through small spaces or holes
Examples from the Corpus
seepage• By the sampling point there is an iridescence on the water which regularly fans out, indicating a seepage of oil.• No one in town has taken floodwater, though some basements are wet from seepage.• Manure seepage from storage areas is polluting waterways and evaporating ammonia is contributing to acid rain.• There was some oil seepage from the valves in the car's engine.• A more sinister development is the seepage of nitrate into aquifers which are used as sources of the domestic water supply.• However, this seepage was slight and not a problem.• Most homes in town get some water in their basements, mostly due to seepage from the rain.• This will prevent water seepage into the building. 