English

Noun

underdrain ‎(plural underdrains)

1. An underground drain or trench with openings through which the water may percolate from the soil or ground above.

Verb

underdrain ‎(third-person singular simple present underdrains, present participle underdraining, simple past and past participle underdrained)

1. (transitive) To drain by forming an underdrain or underdrains in.

Related terms

• underdrainage