undrain

“The experiments with fresh and septic sludge show that for filters of the same size material, fresh sludge passes through into the undrains while septic sludge merely gives up its water.”

“New undrains, gravel retaining screens and air wash systems were installed.”

“The probable differences between gross and net drain also require an explanation of why some manpower "undrains" by returning home after a period of working in the United States.”

“On this score, monastics are will-positioned, in that one of the purposes of monastic work was to recreate the garden of paradise. The Cistercians, however, have not made a move to undrain the swamps.”