"Underdrain" is a word in ENGLISH

underdrain ENGLISH
Definition:

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

underdrain ENGLISH
Definition:

To drain by forming an underdrain or underdrains in;
as, to underdrain land.

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underditch ENGLISH

To dig an underground ditches in, so as to drain the surface; to underdrain; as, to underditch a field or …

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