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[uhn-der-drey-nij] /ˈʌn dərˌdreɪ nɪdʒ/
drainage of agricultural lands and removal of excess water and of alkali by drains buried beneath the surface.
Origin of underdrainage
1800-10; under- + drainage Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for underdrainage
  • The pavement thickness determination will include the aggregate base and underdrainage design.
  • Both infiltration systems also can use underdrainage.
  • Infiltration treatment systems can be designed to include underdrainage.
  • Serious deficiencies in the trickling filter included a poor underdrainage system and improper media specifications.
  • underdrainage would be required, which would be collected and discharged into open ditches.
  • The ditches would be excavated to convey underdrainage to established waterways.
  • To avoid the potential for raising the level of the groundwater, an underdrainage system would be provided.
  • Underdrains with semi-circular inverts shall exist and the underdrainage system shall cover the entire floor of the filter.

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