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The boat enters the lock. 8–9. The boat enters the lock. 3. The lower gates are closed. 10. The upper gates are closed. 4–5. The lock is filled with water from upstream. 11–12. The lock is emptied by draining its water downstream. 6. The upper gates are opened. 13. The lower gates are opened. 7. The boat exits the lock. 14. The boat exits ...
A failure of the lock gates—for example, caused by a runaway ship hitting a gate—could unleash a flood on the lands downstream of the locks, as the lake above the locks (Gatun Lake or Miraflores Lake) drains through the lock system. Extra precaution against this is provided by doubling the gates at both ends of the upper chamber in each ...
The T. J. O’Brien Lock and Dam at Chicago, Illinois, is a guard lock that controls the outflow of water from Lake Michigan into the Illinois Waterway while locking vessels through between the waterway and Lake Michigan. [1] Lock 8 near the south end of the Welland Canal at Port Colborne, Ontario, Canada is a guard lock.
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 ...
Filling the lock through culverts eliminated that problem, as well as putting the lock gate below the breast wall. Lock 27 is a curious combination of the two specifications, having the culverts inside the masonry, but the upper gate below the breast wall. This is because of multiple contractors working on the lock after a lapse of time. [27]
A boat lift, ship lift, or lift lock is a machine for transporting boats between water at two different elevations, and is an alternative to the canal lock. It may be vertically moving, like the Anderton boat lift in England , rotational, like the Falkirk Wheel in Scotland , or operate on an inclined plane , like the Ronquières inclined plane ...
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The quick turn is essentially a figure eight. On a sailboat it consists of the following steps: Change course to a beam reach and hold for 15 seconds; Head into the wind and tack, leave the jib fluttering; Veer off until the boat is at a broad reach; Turn upwind until the vessel is pointing at the victim; at this point the vessel should be on a ...