Drainage (noun)

1. The action or process of draining something, especially land or water.
2. The system of pipes, ditches, or other channels that carry away water or waste liquids.
3. The removal of excess fluid or pus from a part of the body, especially by surgical means.

Origin:

Mid 17th century: from drain, on the pattern of enclosure.

Examples:

1. The drainage system was clogged with leaves and debris, causing water to overflow.
2. The drainage of the swamp has made it possible to build homes and farms on the land.
3. Surgeons performed a drainage procedure to remove the infected fluid from the patient's abdomen.
4. The city has invested in improving its drainage infrastructure to prevent future flooding.
5. Poor drainage has led to a proliferation of mosquitoes in the low-lying areas of the city.