underdrain
Etymology
From under- + drain.
underdrain means an underground drain or trench with openings through which the water may percolate from the soil or ground above. Lexicurio rates it Sui generis — a strength score of 89 out of 100.
noun
- An underground drain or trench with openings through which the water may percolate from the soil or ground above.
verb
- To drain by forming an underdrain or underdrains in.