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In 1929, the canalization project on the Ohio River was finished. The project produced 51 wooden wicket dams and 600 foot by 110 foot lock chambers along the length of the river. During the 1940s, a shift from steam propelled to diesel powered towboats allowed for tows longer than the 600 foot locks on the river.
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 ...
Most locks are closed by chevron or mitre gates rather than by caissons. These are pairs of hinged gates that form a "V" shape, with the deeper water outside the V. Water pressure thus holds them closed. These gates can be opened and closed quickly, so they are used for canal locks, to change levels, and also for most freight docks.
A plan and side view of a generic, empty canal lock. A lock chamber separated from the rest of the canal by an upper pair and a lower pair of mitre gates.The gates in each pair close against each other at an 18° angle to approximate an arch against the water pressure on the "upstream" side of the gates when the water level on the "downstream" side is lower.
Stoplogs are modular in nature, giving the operator of a gated structure the ability to control the water level in a channel by adding or removing individual stoplogs. A gate may make use of one or more logs. Each log is lowered horizontally into a space or bay between two grooved piers referred to as a stoplog check. [3]
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.
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