Canals, or navigations, are human-made channels, or artificial waterways, for water conveyance, or to service water transport vehicles.
In most cases, the engineered works will have a series of dams and locks that create reservoirs of low speed current flow. These reservoirs are referred to as slack water levels, often just called levels.
A canal is also known as a navigation when it parallels a river and shares part of its waters and drainage basin, and leverages its resources by building dams and locks to increase and lengthen its stretches of slack water levels while staying in its valley.
In contrast, a canal cuts across a drainage divide atop a ridge, generally requiring an external water source above the highest elevation.
Many canals have been built at elevations towering over valleys and other water ways crossing far below.
Canals with sources of water at a higher level can deliver water to a destination such as a city where water is needed. The Roman Empire's aqueducts were such water supply canals.
An artificial waterway or artificially improved river used for travel, shipping, or irrigation.
A tubular channel within the body.
One of the faint, hazy markings resembling straight lines on early telescopic images of the surface of Mars.
To dig an artificial waterway in or to (a place), especially for drainage
To travel along a canal by boat
An artificial channel that is constructed to convey water from one location to another.
A structure carrying water over a river or depression, especially in regards to ancient aqueducts.
an artificial waterway constructed to allow the passage of boats or ships inland or to convey water for irrigation
"the Oxford Canal"
"they travelled on by canal"
a tubular duct in a plant or animal, serving to convey or contain food, liquid, or air
"the ear canal"
any of a number of linear markings formerly reported as seen by telescope on the planet Mars.
An artificial channel filled with water and designed for navigation, or for irrigating land, etc.
A tube or duct; as, the alimentary canal; the semicircular canals of the ear.
A long and relatively narrow arm of the sea, approximately uniform in width; - used chiefly in proper names; as, Portland Canal; Lynn Canal.
A conductor, conduit, or artificial channel for conveying water, especially one for supplying large cities with water.
A canal or passage; as, the aqueduct of Sylvius, a channel connecting the third and fourth ventricles of the brain.
(astronomy) an indistinct surface feature of Mars once thought to be a system of channels; they are now believed to be an optical illusion
a bodily passage or tube lined with epithelial cells and conveying a secretion or other substance;
"the tear duct was obstructed"
"the alimentary canal"
"poison is released through a channel in the snake's fangs"
long and narrow strip of water made for boats or for irrigation
provide (a city) with a canal
a conduit that resembles a bridge but carries water over a valley
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