seepage

[see-pij]
noun
1.
the act or process of seeping; leakage.
2.
something that seeps or leaks out.
3.
a quantity that has seeped out.

Origin:
1815–25; seep + -age

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
seepage (ˈsiːpɪdʒ)
 
n
1.  the act or process of seeping
2.  liquid or moisture that has seeped

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

seepage

in soil engineering, movement of water in soils, often a critical problem in building foundations. Seepage depends on several factors, including permeability of the soil and the pressure gradient, essentially the combination of forces acting on water through gravity and other factors. Permeability can vary over a wide range, depending on soil structure and composition, making possible the safe design of such structures as earth dams and reservoirs with negligible leakage loss, and other structures such as roadbeds and filtration beds in which rapid drainage is desirable.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
Disturbed migration paths and petro chemical seepage cause long term disease
  and sterility in animal populations.
The stored charge can vary in time due to contamination or seepage.
My guess is that seepage losses are larger than evaporation losses.
In a city acutely short of water, several parks use plastic to stop seepage.
Synonyms
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