underdrainage

[uhn-der-drey-nij]
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noun

drainage of agricultural lands and removal of excess water and of alkali by drains buried beneath the surface.

Origin of underdrainage

First recorded in 1800–10; under- + drainage
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for underdrainage

Historical Examples of underdrainage