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A pound lock has a chamber with gates at both ends that control the level of water in the pound. In contrast, an earlier design with a single gate was known as a flash lock. [4] Pound locks were first used in China during the Song dynasty (960–1279 CE), having been pioneered by the Song politician and naval engineer Qiao Weiyue in 984. [5]
A short pound on the Chesterfield Canal in England, United Kingdom. A canal pound (from impound), [1] reach, or level (American usage), is the stretch of level water impounded between two canal locks. Canal pounds can vary in length from the non-existent, where two or more immediately adjacent locks form a lock staircase, to many kilometres/miles.
The new cut was protected by Lea Bridge Half Lock, a single set of gates just below the junction. [7] Homerton Lock, which was also known as Hackney Brick Cistern Lock, was about one-third of the way along the cut, [8] while Old Ford Lock was located just above where the cut rejoined the old course of the river. The lock was semi-tidal, as the ...
Lock (water navigation)#Pound lock To a section : This is a redirect from a topic that does not have its own page to a section of a page on the subject. For redirects to embedded anchors on a page, use {{ R to anchor }} instead .
Fourteen Locks (grid reference) is a series of locks, also known as the Cefn Flight, on the Crumlin arm of the Monmouthshire Canal at Rogerstone in Newport, South Wales.The flight of locks was completed in 1799 and raises the water level 160 ft (50 m) in just 800 yd (740 m).
Staircase lock of eight locks constructed by Thomas Telford in 1811 lifting boats 64 feet (20 m). Tardebigge Locks: Worcester and Birmingham Canal: grid reference: Longest flight in the UK. 30 locks rising 67m. Tuel Lane Lock: Rochdale Canal: grid reference: Deepest lock in the United Kingdom, with a fall of 19' 8½". [1] Watford Locks
How a lock with a side pond works. Below the bottom lock was a long level pound stretching to beyond Blisworth Tunnel. The seven locks raised the level of the canal by 63 feet (19 m) to a fairly short summit pound, which passed through Braunston Tunnel and then descended through five locks to Braunston. [3]
The pound lock holds water between two gates, and is considerably easier to navigate. Pound locks have been built in China since 983, in the Netherlands from 1065 and in Britain from the 1560s. Nevertheless, a few flash locks remained after the introduction of pound locks.