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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.
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.
The wicket, i.e. large paddle valve, hidden in the masonry recess where the upper gate fit in, would be opened, and water would flow through the lock masonry to three openings in the lock chamber. Both sides of the lock had these, so there would be a total of 2 wickets, and 6 openings. The upper gate is above the breast wall.
Next, the upper gates (A) and the filling valve (C) are closed and the draining valve (D) is opened allowing water to drain via gravity out to Puget Sound. [2]: 2 When the water pressure is equal on both sides of the gate, the lower gates (B) are opened, allowing the vessels to leave the lock chamber. [2]: 2
As the Leeds Liverpool canal is a wide canal, the chambers are slightly more than 14 feet (4.3 m) wide, and each gate consists of two half-gates, "hinged" from opposite sides of the canal. Each half gate is slightly more than 7 feet (2.1 m) wide, so that the two halves close in a "V" shape (pointing "upstream").
How a lock with a side pond works. The locks are unusual for narrow canals, in that they are fitted with mitre gates at both top and bottom, as opposed to the more usual clapper top gate. [14] The chambers are constructed from large blocks of stone, with mason's marks visible on many of them. The locks were equipped with side ponds to save ...
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