Definition
A runway whose surface has been cut with shallow, evenly spaced transverse grooves to provide channels for water to escape from beneath aircraft tires, improving tire-to-pavement contact and reducing the risk of hydroplaning during landing or takeoff on a wet surface.
Plain English
A runway with small grooves cut across it so that rainwater can drain away under the tires instead of building up. This helps the tires keep a firm grip on the pavement when the runway is wet.
Context Anchor
You will see this term in wet-runway, braking, landing distance, and hydroplaning discussions.
Derivation
Groove comes from an old word meaning a channel or furrow. That helps here because the runway grooves act like many small channels that give water a path off the tire contact area.
Why Pilots Care
Grooved runways greatly reduce the chance of hydroplaning, helping pilots keep directional control during wet landings.
Intuition Check
Do not read “grooved” as simply meaning rough or worn. A grooved runway has deliberate drainage cuts made in the pavement.
Example Sentence 1
The destination airport has a grooved runway, which gives us better braking action despite the steady rain in the forecast.
Example Sentence 2
Airport crews repaved the runway with grooves to improve safety when water is standing on the surface.