A sluice ( ) is a water channel containing a sluice gate, a type of

lock Lock(s) or Locked may refer to: Common meanings *Lock and key, a mechanical device used to secure items of importance *Lock (water navigation), a device for boats to transit between different levels of water, as in a canal Arts and entertainme ...

to manage the water flow and water level. There are various types of sluice gates, including flap sluice gates and fan gates. Different depths are calculated when design sluice gates. Sluices are used for channeling water toward a

water mill A watermill or water mill is a mill that uses hydropower. It is a structure that uses a water wheel or water turbine to drive a mechanical process such as milling (grinding), rolling, or hammering. Such processes are needed in the production ...

, including for transporting logs from steep hillsides. Different terms are used regionally for sluices; the terms ''sluice'', ''sluice gate'', ''knife gate'', and ''slide gate'' are used interchangeably in the water and

wastewater Wastewater (or waste water) is water generated after the use of freshwater, raw water, drinking water or saline water in a variety of deliberate applications or processes. Another definition of wastewater is "Used water from any combination of do ...

control industry.

Etymology

The term "sluice" originates from the Middle English word scluse, which derived from the Old French escluse (modern French: écluse). This, in turn, came from the Late Latin exclusa, a shortening of aqua exclusa, meaning "excluded water" or "a shut-off water channel." The Latin exclusa is the feminine past participle of excludere ("to shut out, exclude"), from *ex-* ("out") and claudere ("to close").

Regional names

* In the

Somerset Levels The Somerset Levels are a coastal plain and wetland area of Somerset, England, running south from the Mendips to the Blackdown Hills. The Somerset Levels have an area of about and are bisected by the Polden Hills; the areas to the south ...

, sluice gates are known as ''clyse'' or ''clyce''.Dunning R. W. (2004). ''History of the County of Somerset: Volume 8: The Poldens and the Levels'' (

Victoria County History The Victoria History of the Counties of England, commonly known as the Victoria County History (VCH), is an English history project which began in 1899 with the aim of creating an encyclopaedic history of each of the historic counties of Englan ...

). Oxford: Oxford University Press. . * Most of the inhabitants of

Guyana Guyana, officially the Co-operative Republic of Guyana, is a country on the northern coast of South America, part of the historic British West Indies. entry "Guyana" Georgetown, Guyana, Georgetown is the capital of Guyana and is also the co ...

refer to sluices as ''kokers''. * The Sinhala people in Sri Lanka, who had an ancient civilization based on harvested rain water, refer to sluices as ''Horovuwa''.

Description

A ''sluice'' is a water channel containing a ''sluice gate'', a movable gate allowing water to flow under it. Sluices are a type of

to manage the water flow and water level. When a sluice is lowered, water may spill over the top, in which case the gate operates as a

weir A weir or low-head dam is a barrier across the width of a river that alters the flow characteristics of water and usually results in a change in the height of the water level. Weirs are also used to control the flow of water for outlets of l ...

. Usually, a mechanism drives the sluice up or down. This may be a simple, hand-operated, chain pulled/lowered, worm drive or rack-and-pinion drive, or it may be electrically or hydraulically powered. A flap sluice, however, operates automatically, without external intervention or inputs.

Basic design

Sluice gates are one of the most common hydraulic structures used to control or measure the flow in open channels. Vertical rising sluice gates are the most common in open channels and can operate under two flow regimes: free flow and submerged flow. The most important depths in the designing of sluice gates are:

Types

; Fan gate: () This type of gate was invented by the Dutch

hydraulic engineer Hydraulic engineering as a sub-discipline of civil engineering is concerned with the flow and conveyance of fluids, principally water and sewage. One feature of these systems is the extensive use of gravity as the motive force to cause the move ...

in 1808. He was Inspector-General for ''Waterstaat'' (

Water resource management Water resources are natural resources of water that are potentially useful for humans, for example as a source of drinking water supply or irrigation water. These resources can be either Fresh water, freshwater from natural sources, or water produ ...

) of the Kingdom of Holland at the time. The fan door has the special property that it can open in the direction of high water solely using water pressure. This gate type was primarily used to purposely inundate certain regions, for instance in the case of the Hollandic Water Line. Nowadays this type of gate can still be found in a few places, for example in Gouda. A fan gate has a separate chamber that can be filled with water and is separated on the high-water-level side of the sluice by a large door. When a tube connecting the separate chamber with the high-water-level side of the sluice is opened, the water level, and with that the water pressure in this chamber, will rise to the same level as that on the high-water-level side. As there is no height difference across the larger gate, it exerts no force. However the smaller gate has a higher level on the upstream side, which exerts a force to close the gate. When the tube to the low water side is opened the water level in the chamber will fall. Due to the difference in the surface areas of the doors there will be a net force opening the gate. ; Flap sluice gate: A fully automatic type, controlled by the pressure head across it; operation is similar to that of a

check valve A check valve, non-return valve, reflux valve, retention valve, foot valve, or one-way valve is a valve that normally allows fluid (liquid or gas) to flow through it in only one direction. Check valves are two-port valves, meaning they have ...

. It is a gate hinged at the top. When pressure is from one side, the gate is kept closed; a pressure from the other side opens the sluice when a threshold pressure is surpassed. ; Logging sluices: In the mountains of the United States, sluices transported logs from steep hillsides to downslope

sawmill A sawmill (saw mill, saw-mill) or lumber mill is a facility where logging, logs are cut into lumber. Modern sawmills use a motorized saw to cut logs lengthwise to make long pieces, and crosswise to length depending on standard or custom sizes ...

ponds or yarding areas. Nineteenth-century

logging Logging is the process of cutting, processing, and moving trees to a location for transport. It may include skidder, skidding, on-site processing, and loading of trees or trunk (botany), logs onto logging truck, trucksmill race A mill race, millrace or millrun, mill lade (Scotland) or mill leat (Southwest England) is the current of water that turns a water wheel, or the channel ( sluice) conducting water to or from a water wheel. Compared with the broad waters of a m ...

leet Leet (or "1337"), also known as eleet or leetspeak, or simply hacker speech, is a system of modified spellings used primarily on the Internet. It often uses character replacements in ways that play on the similarity of their glyphs via refle ...

, flume, penstock or lade is a sluice channeling water toward a

. ; Needle sluice: A sluice formed by a number of thin needles held against a solid frame through water pressure as in a needle dam. ; Radial sluice gate: A structure, where a small part of a cylindrical surface serves as the gate, supported by radial constructions going through the cylinder's radius. On occasion, a counterweight is provided. ; Rising sector sluice gate: Also a part of a cylindrical surface, which rests at the bottom of the channel and rises by rotating around its centre. ; Vertical rising sluice gate: A plate sliding in the vertical direction, which may be controlled by machinery.

Gallery

File:MagomeSluice.jpg, A small wooden sluice in Magome, Japan, used to power a waterwheel File:Sluice gates-KayEss-1.jpeg , Sluice gates near Henley, on the

River Thames The River Thames ( ), known alternatively in parts as the The Isis, River Isis, is a river that flows through southern England including London. At , it is the longest river entirely in England and the Longest rivers of the United Kingdom, s ...

File:Gorinchem - deur van de Korenbrugsluis.jpg, The Korenbrugsluice in

Gorinchem Gorinchem ( ), pronunciation respelling, also spelled Gorkum, is a city and municipality in the western Netherlands, in the province of South Holland. The municipality covers an area of of which is water. It had a population of in . The munici ...

is a fan sluice

References

External links

Soar Valley Sluice Gates

{{Authority control Canals Hydraulic engineering Water transport infrastructure Dutch words and phrases