vt to drain by forming an underdrain or underdrains in; as, to underdrain land.
2. underdrain ·noun an underground drain or trench with openings through which the water may percolate from the soil or ground above.
vt to drain by forming an underdrain or underdrains in; as, to underdrain land.
2. underdrain ·noun an underground drain or trench with openings through which the water may percolate from the soil or ground above.
Webster English vocab. Английский словарь Webster. 2012