underdrainage

[uhn-der-drey-nij]
noun
drainage of agricultural lands and removal of excess water and of alkali by drains buried beneath the surface.

Origin:
1800–10; under- + drainage

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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Collins
World English Dictionary
underdrain
 
n
1.  a drain buried below agricultural land
 
vb
2.  to bury such drains below (agricultural land)
 
'underdrainage
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
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.
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