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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.
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.
Flash locks of this type have been documented in China since at least the 1st century BCE and on the Thames since at least 1295. [5] [6] Flash locks were commonly built into small dams or weirs where a head of water was used for powering a mill. The lock allowed boats to pass the weir while still allowing the mill to operate when the gate was ...
Floodgates, also called stop gates, are adjustable gates used to control water flow in flood barriers, reservoir, river, stream, or levee systems. They may be designed to set spillway crest heights in dams , to adjust flow rates in sluices and canals , or they may be designed to stop water flow entirely as part of a levee or storm surge system.
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The lock-keeper's cottage stands on an island formed by a section of the River Lee Flood Relief Channel which flows through an automatic sluice gate adjacent to the lock.. To the east of the lock is the Amwell Quarry nature reserve a Site of Special Scientific Interest (SSSI) [2] and a section of the Old River Lea known as the Amwell Magna Fishery where it merges with its tributary the River Ash.
There were further improvements throughout the 19th century, including the Lee Navigation Improvement Act 1850 (13 & 14 Vict. c. cix) to authorise new lock cuts at Hoddesdon, Carthagena Lock , Waltham Marsh, Tottenham, Walthamstow, Hackney, Leyton and Bromley-by-Bow and new locks at Hunter's Gate (Bow Bridge) and Old Ford.
It has conventional mitre gates at one end, but uses rotating sector gates at the tidal end, each one weighing 12.1 tonnes. [22] It is a dual-purpose structure, designed so that it can be used as a sluice to discharge water by gravity when tide levels in The Haven are appropriate. [17] The lock opened up nearly 12 miles (19 km) of waterway.