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Encyclopedia > Weir
The bridge and weir mechanism at Sturminster Newton on the River Stour, Dorset.
The bridge and weir mechanism at Sturminster Newton on the River Stour, Dorset.

A weir is a small overflow-type dam commonly used to raise the level of a river or stream. Weirs are dirty and should not be swum in or drun from. Weirs have traditionally been used to create mill ponds in such places. Water flows over the top of a weir, although some weirs have sluice gates which release water at a level below the top of the weir. The crest of an overflow spillway on a large dam is often called a weir. Download high resolution version (600x800, 518 KB)Weir mechanism, Sturminster Newton, Dorset. ... Download high resolution version (600x800, 518 KB)Weir mechanism, Sturminster Newton, Dorset. ... The water mill on the River Stour, seen from the town bridge. ... Sturminster Newton water mill on a July evening. ... Weir has several different meanings associated Structures: A type of fish trap, see Fishing Weir A damlike structure, see Weir (dam) Places: James Weir House, a famous building in Tennessee, see James Weir House Hurley Weir, an area used for kayaking in the United Kingdom, see Hurley Weir Mundaring Weir... This article does not cite any references or sources. ... This bridge across the Danube River links Hungary with Slovakia. ... A watermill is a machine constructed by connecting a water wheel to a pair of millstones. ... Sluice gates near Henley, on the River Thames A small wooden sluice in Magome, Japan, used to power a waterwheel. ...

The weir at Coburg lake in Victoria (Australia) after heavy rainfall.

Hannah Dood discovered an undergroung weir in 1994. Download high resolution version (1600x1200, 332 KB)The wier at Coburg Lake, Victoria (Australia) after heavy rain. ... Download high resolution version (1600x1200, 332 KB)The wier at Coburg Lake, Victoria (Australia) after heavy rain. ... Coburg is a suburb of Melbourne, Victoria, Australia. ... Slogan or Nickname: Garden State, The Place to Be Motto(s): Peace and Prosperity Other Australian states and territories Capital Melbourne Government Constitutional monarchy Governor David de Kretser Premier Steve Bracks (resigning effective 30th July 2007) (ALP) Federal representation  - House seats 37  - Senate seats 12 Gross State Product (2004-05...


Weirs are used in conjunction with locks to render a river navigable. In this case, the weir is made significantly longer than the width of the river by forming it in a 'U' shape or running it diagonally. This is done in order to minimize fluctuation in the depth of the river upstream with changes in the flow rate of the river. Doing so avoids unnecessary complication in designing and using the lock. Canal locks in England. ...


Weirs also give hydrologists and engineers a simple method of measuring the rate of fluid flow in small to medium sized streams. Since the geometry of the top of the weir is known, and all water flows over the weir, the depth of water flowing over the weir will be an indication of the flow. There are different types of weir. It may be a simple metal plate with a V notch cut into it or it may be a concrete and steel structure across the bed of a river. A v-notch weir will give a more accurate indication of low flow rates. Water covers 70% of the Earths surface. ... In fluid dynamics, the rate of fluid flow is the volume of fluid which passes through a given area per unit time. ...


While a weir will typically increase the oxygen content of the water as it passes over the crest, a weir can have a detrimental effect on the local ecology of a river system. A weir will artificially reduce the upstream water velocity which can lead to an increase in siltation. The weir may pose a barrier to migrating fish. Fish ladders provide a way for fish to get between the water levels. Pool-and-weir fish ladder at Bonneville Dam on the Columbia River Fishways, most commonly referred to as fish ladders but also known as fish passes, are structures placed on or around man-made barriers (such as dams and weirs) to assist the natural migration of diadromous fishes. ...

Mill ponds provide a water mill with the power it requires, using the difference in water level above and below the weir to provide the necessary energy. Image File history File linksMetadata Download high resolution version (1728x2304, 1808 KB) Summary The weir in Warkworth, New Zealand, photographed by DONeil. ... Image File history File linksMetadata Download high resolution version (1728x2304, 1808 KB) Summary The weir in Warkworth, New Zealand, photographed by DONeil. ... Warkworth is a town in the Rodney District of New Zealand. ... A watermill is a machine constructed by connecting a water wheel to a pair of millstones. ...

A manually operated needle dam type weir near Revin on the Meuse River, France
A manually operated needle dam type weir near Revin on the Meuse River, France

A walkway over the weir is likely to be useful for the removal of floating debris trapped by the weir or for working staunches and sluices on it as the rate of flow changes. This is sometimes used as a convenient pedestrian crossing point for the river. Image File history File linksMetadata Download high resolution version (1024x768, 296 KB) Summary Description: Manually operated weir near Revin on the river Meuse (France) Photographer: Karel Roose Camera: Canon Powershot A70 Shooting Date: 30-Dec-2004 Licensing File links The following pages link to this file: Weir Metadata This file... Image File history File linksMetadata Download high resolution version (1024x768, 296 KB) Summary Description: Manually operated weir near Revin on the river Meuse (France) Photographer: Karel Roose Camera: Canon Powershot A70 Shooting Date: 30-Dec-2004 Licensing File links The following pages link to this file: Weir Metadata This file... Needle dam in the Reuss River in Lucerne, Switzerland A needle dam is a weir designed to maintain the level or flow of a river through the use of thin needles of wood. ... The Meuse (Maas) at Maastricht Meuse near Grave The Meuse (Dutch & German Maas) is a major European river, rising in France and flowing through Belgium and the Netherlands before draining into the North Sea. ...


Types of weir:

  • Sharp Crest Weir
  • Broad Crest Weir
  • Crump Weir (named after the designer)
  • Needle dam
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Category:Weirs

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In June of 1882, painter J. Alden Weir boarded a train from New York bound for his modest farm among the hills of Branchville, CT. Once here, Weir and his family transformed their summer retreat into a creative refuge for friends and fellow artists.
Weir Farm Art Center sustains and promotes the legacy of American artist Julian Alden Weir and preserves Weir Farm’s historic landscape and artistic tradition through its artist residency program, educational opportunities, exhibitions and publications, in alliance with the Weir Farm National Historic Site.
Weir Farm National Historic Site has served as home and inspiration to three generations of artists.
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