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For a boat travelling upstream, the process is reversed; the boat enters the empty lock, and then the chamber is filled by opening a valve that allows water to enter the chamber from the upper level. The whole operation will usually take between 10 and 20 minutes, depending on the size of the lock and whether the water in the lock was ...
Ship caisson at Droogdok Jan Blanken at Hellevoetsluis. 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.
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 ...
The Weurt lock has an additional gate near the centre of the chamber. When only a few short boats want to go through the lock, they can use one half the chamber, saving water. Furthermore, when one of the gates is taken out of service for maintenance, the lock can still function at reduced capacity.
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 System , and is used to control water diversion from Lake Michigan into the river and for navigation.
The 74 lift locks came in several varieties. A boat traveling the length of the canal would also go through two guard locks: at Big Slackwater and Little Slackwater. [13] Locks were typically 100 feet long, 15 feet wide, and 16 feet deep. They lifted boats between 6 and 10 feet. [14]