the.com/drainage
Gravity's customer service department, quietly relocating water before it ruins your day.
means The system or process of removing excess water from land, structures, or the body.
from From the Old English dreahnian, to strain or drain dry, sharing roots with dry — water shown the exit since before plumbing existed.
Roman featThe Cloaca Maxima drained Rome 2,500 years ago.
Medical senseSurgeons drain wounds to evict trapped fluid.
Land valuePoor drainage quietly destroys foundations and crops alike.