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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]
Summit pound (level) on the Morris Canal, fed by Lake Hopatcong through a feeder canal. A summit pound is formed at a summit on the canal, and where all the defining locks descend from the pound. Summit pounds are particularly important in canal design, as every boat entering or leaving the pound causes a loss of water.
When a lock is emptying, water from the top of the lock fills the side pond, and the rest is then discharged to the lower pound. When a lock is filling, the bottom of the lock is filled from the pond, and the rest is drawn from the upper pound. Typically, this system uses 40 per cent less water, but the ponds have been disused for a long time ...
A pound lock was built on the Swift Ditch by the Oxford-Burcot Commission in 1635 making it then the navigation route. In 1788 several citizens of Abingdon wanted to divert navigation back to the current course, possibly taking into account the Wilts & Berks Canal which was to connect to the current navigation channel at Abingdon within ten years.
Marlow Lock is a lock and weir situated on the River Thames in the town of Marlow, Buckinghamshire, England, about 300m downstream of Marlow Bridge. The first pound lock was built by the Thames Navigation Commission in 1773.
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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 ...
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