Sea-level canal and lock canal
Topic: World Transport and Communication · NCERT: Class 12, Ch 7 "Transport and Communication"
Meaning
A sea-level canal joins two water bodies that are at about the same level. It needs no locks, so ships sail straight through. A lock canal crosses higher land. It uses locks, which are closed chambers where the water level is raised or lowered to lift or drop a ship step by step. Which type is built depends on the land the canal has to cross.
Example
The Suez Canal (Egypt, Port Said to Suez) is a sea-level canal with no locks. The Panama Canal (Colon to Panama City) is a lock canal, where six locks raise and lower ships about 26 m.
Don't confuse with
- A common exam trap: the statement "Suez has locks" is false. Only Panama uses locks.
Related concepts
- Shipping canal
- Suez Canal
- Panama Canal
- Panama Canal Zone
- Panama Canal water crisis
- Maritime chokepoint
- Northern Sea Route
- Northwest Passage