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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 needles are leaned against a solid frame and are not intended to be water-tight. Individual needles can be added or removed by hand to constrict the flow of the river, forming a sluice.
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 river level. There are many designs of weir, but commonly water flows freely over the top of the weir crest before cascading down to a lower level.
A sluice is a water channel controlled at its head by a gate. A mill race, leet, flume, penstock or lade is a sluice channelling water toward a water mill. The terms sluice, sluice gate, knife gate, and slide gate are used interchangeably in the water and wastewater control industry.
One early needle dam maintains the level of Lake Lucerne in Lucerne, Switzerland by restricting the flow of the Reuss, several are still in operation on the Meuse, France and others were built in the United States in the 19th century.
Lake Lucerne is a lake in central Switzerland and the fourth largest in the country.
The Reuss is a river in Switzerland. With a length of 164 kilometres (102 mi) and a drainage basin of 3,426 square kilometres (1,323 sq mi), it is the fourth largest river in Switzerland. The upper Reuss forms the main valley of the canton of Uri. The course of the lower Reuss runs from Lake Lucerne to the confluence with the Aare at Brugg and Windisch.
The Meuse or Maas is a major European river, rising in France and flowing through Belgium and the Netherlands before draining into the North Sea from the Rhine–Meuse–Scheldt delta. It has a total length of 925 km.
The first needle dam in the United States was completed in 1896 on the Big Sandy River, downstream from the city of Louisa, Kentucky.
Louisa is a home rule-class city located at the merger of the Levisa and Tug Forks into the Big Sandy River. It is located in Lawrence County, Kentucky, in the United States and is the seat of its county. The population was 2,467 at the 2010 census.
A similar approach, now known as paddle and rymer weirs, was used since medieval times on the River Thames in England to create flash locks.
The River Thames, known alternatively in parts as the Isis, is a river that flows through southern England including London. At 215 miles (346 km), it is the longest river entirely in England and the second longest in the United Kingdom, after the River Severn.
England is a country that is part of the United Kingdom. It shares land borders with Wales to the west and Scotland to the north-northwest. The Irish Sea lies west of England and the Celtic Sea lies to the southwest. England is separated from continental Europe by the North Sea to the east and the English Channel to the south. The country covers five-eighths of the island of Great Britain, which lies in the North Atlantic, and includes over 100 smaller islands, such as the Isles of Scilly and the Isle of Wight.
Early locks were designed with a single gate, known as a flash lock or staunch lock. The earliest European references to what were clearly flash locks were in Roman times.
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The Ruhr is a river in western Germany, a right tributary (east-side) of the Rhine.
Whitewater is formed in a rapid, when a river's gradient increases enough to generate so much turbulence that air is entrained into the water body, that is, it forms a bubbly or aerated and unstable current; the frothy water appears white. The term is also loosely used to refer to less turbulent, but still agitated, flows.
A stream gauge, streamgage or gauging station is a location used by hydrologists or environmental scientists to monitor and test terrestrial bodies of water. Hydrometric measurements of water level surface elevation ("stage") and/or volumetric discharge (flow) are generally taken and observations of biota and water quality may also be made. The location of gauging stations are often found on topographical maps. Some gauging stations are highly automated and may include telemetry capability transmitted to a central data logging facility.
The Shetucket River is a tributary of the Thames River, 20.4 miles (32.8 km) long, in eastern Connecticut in the United States.
The English River Thames is navigable from Cricklade or Lechlade to the sea, and this part of the river falls 71 meters (234 feet). There are 45 locks on the river, each with one or more adjacent weirs. These lock and weir combinations are used for controlling the flow of water down the river, most notably when there is a risk of flooding, and provide for navigation above the tideway.
The Doe River is a tributary of the Watauga River in northeast Tennessee in the United States. The river forms in Carter County near the North Carolina line, just south of Roan Mountain State Park, and flows to Elizabethton.
Teddington Lock is a complex of three locks and a weir on the River Thames in England between Ham and Teddington in the London Borough of Richmond upon Thames. It was first built in 1810.
Rymer may refer to:
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. Since most of these devices operate by controlling the water surface elevation being stored or routed, they are also known as crest gates. In the case of flood bypass systems, floodgates sometimes are also used to lower the water levels in a main river or canal channels by allowing more water to flow into a flood bypass or detention basin when the main river or canal is approaching a flood stage.
The Cotter River, a perennial river of the Murrumbidgee catchment within the Murray-Darling basin, is located in the Australian Capital Territory, Australia. The Cotter River, together with the Queanbeyan River, is one of two rivers that provides potable water to the Canberra and Queanbeyan region.
The Tuckasegee River flows entirely within western North Carolina. It begins its course in Jackson County above Cullowhee at the confluence of Panthertown and Greenland creeks. It flows in a northwesterly direction into Swain County and through the center of Bryson City, North Carolina. The river passes around the Bryson City Island Park, where it then enters Fontana Lake and then the Little Tennessee River.
The Ross River is a river located in northern Queensland, Australia. The 49-kilometre (30 mi) long river flows through the city of Townsville and empties into the Coral Sea. It is the major waterway flowing through Townsville and the city's main source of drinking water.
Hertford Castle Weir is a weir located in Hertford near to Hertford Castle and next to Hertford Theatre.
Sunbury Lock is a lock complex of the River Thames in England near Walton-on-Thames in north-west Surrey, the third lowest of forty four on the non-tidal reaches. The complex adjoins the right, southern bank about 1⁄2 mile (0.80 km) downstream of the Weir Hotel.
Hurley Lock is a lock and weir on the River Thames in England, situated in a clump of wooded islands close to the village of Hurley, Berkshire. The lock was first built by the Thames Navigation Commissioners in 1773.
Three Mills Wall River Weir is a weir on the Bow Back Rivers, in Bromley-by-Bow and Stratford in the London Borough of Newham, England, near to Three Mills. It was built in 2009, when the Bow Back Rivers were refurbished to make them a key feature of the Olympic Park, London, and maintains water levels through much of the park in conjunction with the Three Mills Lock and sluice on the Prescott Channel.