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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.
Most locks were fitted with V gates, but some locks, particularly around Seven Locks (7, 9, 10, and 12), and also all three North Branch locks (Locks 73–75 [28] [29]), were re-fitted with mechanical drop gates to speed up traffic in those areas. (Note that lock 6 had been converted to a drop gate, and later converted back to a V gate. [30 ...
The gates at both ends of the upper chamber are doubled for safety. Miraflores locks Gate operating machine. 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.
A sluice gate. A sluice (/ s l u s / SLOOS) is a water channel containing a sluice gate, a type of lock to manage the water flow and water level. It can also be an open channel which processes material, such as a river sluice used in gold prospecting or fossicking.
The simple valve system used in the lock gates was replaced by a more complex system using piping in the lock walls, which required them to be much thicker. The two 10 foot (3.0 m) locks in Holland Landing were replaced by a single lock of 20 feet (6.1 m) rise, which meant the walls had to be much thicker to hold the increased weight of water.
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