1. the process of removing water or other liquids from an area
2. a system of pipes, ditches, or channels for carrying away water
3. the natural or artificial removal of surface water and subsurface water from an area
Usage: geography; engineering

Examples

• The city improved the drainage system to prevent flooding.
• Poor drainage in the garden caused the plants to rot.
• The surgeon inserted a tube for drainage after the operation.
• Heavy rainfall overwhelmed the street drainage.
• The field needs better drainage before we can plant crops.
• Storm drainage carries rainwater away from buildings.
• The drainage basin collects water from the surrounding hills.