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The principle of operating a lock is simple. For instance, if a boat travelling downstream finds the lock already full of water: The entrance gates are opened and the boat moves in. The entrance gates are closed. A valve is opened, this lowers the boat by draining water from the chamber. The exit gates are opened and the boat moves out. [11]
The gates separating the chambers in each flight of locks must hold back a considerable weight of water, and must be both reliable and strong enough to withstand accidents, as the failure of a gate could unleash a flood of water downstream. These gates range from 47 to 82 ft (14.33 to 24.99 m) high, depending on position, and are 7 ft (2.13 m ...
The caisson lock is a type of canal lock in which a narrowboat is floated into a sealed watertight box and raised or lowered between two different canal water levels. It was invented in the late 18th century as a solution to the problem posed by the excessive demand for water when conventional locks were used to raise and lower canal boats ...
These gates are made of wooden boards and date from 1814. A guillotine lock is a type of canal lock. The lock itself operates on the same principle as any normal pound lock, but is unusual in that each gate is a single piece, usually of steel, that slides vertically upwards when opened to allow a boat to traverse underneath.
The west gate is open and the east gate is closed putting the lock chamber at the level of the river. The Chicago Harbor Lock, also known as the Chicago River & Harbor Controlling Works, is a stop lock and dam located within the Chicago Harbor in Chicago, Illinois at the mouth of the Chicago River. It is a component of the Chicago Area Waterway ...
Repairs to a leaking lock gate are to begin next week after boaters became stranded when the waterway ran dry. Several boats were marooned between Lock 7 and 8 on the Rochdale Canal in Hebden ...
However, the attraction water from this first ladder was not effective. Instead, most salmon used the locks. This made them an easy target for predators like Herschel the sea lion; also, many were injured by hitting the walls and gates of the locks, or by hitting boat propellers. [10]: 2
A caisson is a form of lock gate. It consists of a large floating iron or steel box. This can be flooded to seat the caisson in the opening of the dock to close it, or pumped dry to float it and allow it to be towed clear of the dock. Graving docks at Birkenhead, closed by a variety of ship caissons and floating (sliding) caissons.
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