Canal n. : An artificial channel filled with water and designed for navigation, or for irrigating land, etc.

Canal n. : A tube or duct; as, the alimentary canal; the semicircular canals of the ear.

Example:
How long is the Canal on 75th ave and camelback?

Taxonomy
canals, locks, boats, waterways, the Panama Canal, United States, canal boats, aqueduct, Germany, ship canals, British canals, lateral canals, the Netherlands, navigable canals, free encyclopedia, transportation, the 19th century, canal system.

Defination from the web:
Canal, Wiltshire, England ... Depending on the stratum the canal passes through, it may be necessary to line the cut with some form of watertight material such as clay or concrete. ...