drainage

/ˈdreɪnɪdʒ/
noun
  1. The process or system by which water or other liquids are drained away from an area.
    • Good drainage is essential for a healthy lawn after heavy rain.
    • The city improved the drainage along the street to prevent flooding.
    • The doctor checked the drainage from the wound to make sure it was healing properly.
  2. The liquid that is drained or flows off, such as wastewater or runoff.
    • After the storm, the drainage from the fields carried soil into the river.
    • The drainage from the factory was tested for pollutants.
    • The drainage from the sink goes into the main sewer pipe.