underdrain

[n. uhn-der-dreyn; v. uhn-der-dreyn]
noun
1.
a drain placed beneath the surface of cultivated fields, streets, etc.
verb (used with object)
2.
to equip or supply with an underdrain or underdrains.

Origin:
1795–1805; under- + drain

Dictionary.com Unabridged
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
Fill the collection point basin with underdrain filter.
The size of underdrain pipe depends on the drainage capacity required.
If underdrain is required, verify top of underdrain backfill material is free of fines.
Center line underdrain would address the potential problem with matching of the new box with the existing box.
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