drainage
//ˈdreɪnɪdʒ//
Noun
drainageSingular
drainagesPlural
1
The process or system by which water or other liquids are drained away from an area.
The drainage in this area is poor, so the streets flood easily after heavy rain.
2
A system of drains, pipes, or channels used to remove excess water or waste liquids.
The old drainage in this building needs to be replaced.
3
The area or district that is drained by a river system or watershed.
The Amazon drainage covers a vast area of South America.