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Reservoir (water)
A RESERVOIR (from French réservoir – a "storehouse" ) is a storage space for fluids. These fluids may be water, hydrocarbons or gas. A reservoir usually means an enlarged NATURAL or ARTIFICIAL LAKE, STORAGE POND or IMPOUNDMENT created using a dam or lock to store water. Reservoirs can be created by controlling a stream that drains an existing body of water. They can also be constructed in river valleys using a dam. Alternately, a reservoir can be built by excavating flat ground or constructing retaining walls and levees . Tank reservoirs store liquids or gases in storage tanks that may be elevated, at grade level, or buried. Tank reservoirs for water are also called cisterns . Underground reservoirs are used to store liquids, principally either water or petroleum , below ground
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Lake Salto
LAGO DEL SALTO is a reservoir lake in the Province of Rieti
Province of Rieti
, Lazio
Lazio
, Italy
Italy
. At an elevation of 535 m, its surface area is 10 km². This Lazio
Lazio
location article is a stub . You can help by expanding it
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Drainage Basin
A DRAINAGE BASIN or CATCHMENT AREA is any area of land where precipitation collects and drains off into a common outlet, such as into a river , bay , or other body of water. The drainage basin includes all the surface water from rain runoff , snowmelt , and nearby streams that run downslope towards the shared outlet, as well as the groundwater underneath the earth's surface. Drainage basins connect into other drainage basins at lower elevations in a hierarchical pattern , with smaller SUB-DRAINAGE BASINS, which in turn drain into another common outlet. Other terms used to describe drainage basins are CATCHMENT, CATCHMENT BASIN, DRAINAGE AREA, RIVER BASIN and WATER BASIN. In North America
North America
, the term WATERSHED is commonly used to mean a drainage basin, though in other English-speaking countries, it is used only in its original sense, to mean a drainage divide , a ridge that separates adjacent drainage basins
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Llyn Clywedog
The CLYWEDOG RESERVOIR (Welsh : Llyn Clywedog) is a reservoir near Llanidloes , Wales
Wales
. Completed in 1967, the reservoir was built near the B4518 road , Powys
Powys
, to supply water to Birmingham and the English Midlands by river regulation and to mitigate flooding in the lower Severn by storing excess winter rainfall. The reservoir was formed by damming the Afon Clywedog , a tributary of the River Severn
River Severn
. Its concrete buttress dam is the tallest concrete dam in the UK, with a height of 72 metres and a length of 230 metres. When at capacity the reservoir contains approximately 50,000 megalitres of water. A second, much smaller embankment dam is located at Bwlch-y-gle to prevent overflow into the next valley
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Mid Wales
MID WALES (Welsh : Canolbarth Cymru or simply Y Canolbarth "The Midlands") is the name given to the central region of Wales
Wales
. The Mid Wales
Wales
Regional Committee of the National Assembly for Wales
Wales
covered the counties of Ceredigion and Powys and the area of Gwynedd
Gwynedd
that had previously been the district of Meirionydd . A similar definition is used by the BBC
BBC
. The Wales
Wales
Spatial Plan defines a region known as "Central Wales" which covers Ceredigion and Powys. If Mid Wales
Wales
is classed as Ceredigion and Powys, the area would be 6,962 square kilometres (about the size of Cumbria )
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Petrella Salto
PETRELLA SALTO is a comune (municipality) in the Province of Rieti
Province of Rieti
in the Italian region Latium
Latium
, located about 60 kilometres (37 mi) northeast of
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Llyn Celyn
LLYN CELYN is a large reservoir constructed between 1960 and 1965 in the valley of the River Tryweryn in Gwynedd
Gwynedd
, Wales
Wales
. It measures roughly 2.5 miles (4.0 km) long by 1 mile (1.6 km) wide, and has a maximum depth of 140 ft (43 m). It has the capacity to hold 71,200,000 cubic metres (93,100,000 cu yd) of water. It was originally to be named Llyn Tryweryn Mawr (meaning "Great Tryweryn Lake"), but in September 1964 Liverpool
Liverpool
Corporation agreed to the name change following a letter by the Tryweryn Defence Committee. CONTENTS * 1 Construction and opposition * 2 Operation of reservoir * 3 Diversions and closures of transport links * 4 See also * 5 References * 6 External links CONSTRUCTION AND OPPOSITIONConstruction of the reservoir involved flooding the village of Capel Celyn and adjacent farmland, a deeply controversial move
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Nile
The NILE ( Arabic
Arabic
: النيل‎‎, Egyptian Arabic en-Nīl, Standard Arabic an-Nīl; Coptic : ⲫⲓⲁⲣⲱ, P(h)iaro; Ancient Egyptian : Ḥ'pī and Jtrw; Biblical Hebrew : היאור, Ha-Ye'or or השיחור, Ha-Shiḥor) is a major north-flowing river in northeastern Africa . It is generally regarded as the longest river in the world, however other conflicting sources cite a 2007 study that gave the title to the Amazon River
River
in South America
South America

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Egypt
Coordinates : 26°N 30°E / 26°N 30°E / 26; 30 Arab Republic
Republic
of Egypt جمهورية مصر العربية * ARABIC : Jumhūrīyat Miṣr al-ʿArabīyah EGYPTIAN : Gomhoreyet Maṣr El ʿArabeya Flag Coat of arms ANTHEM: Bilady, Bilady, Bilady My country, my country, my country Capital and largest city
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River Taff
The RIVER TAFF (Welsh : AFON TAF) is a river in Wales
Wales
. It rises as two rivers in the Brecon Beacons
Brecon Beacons
— the Taf Fechan (Little Taff) and the Taf Fawr (Big Taff) — before joining to form the Taff north of Merthyr Tydfil
Merthyr Tydfil
. The river supports a number of migratory fish , including salmon , sea trout , and eel . CONTENTS* 1 Course * 1.1 Diversion in Cardiff
Cardiff
* 2 Taf Fawr * 3 Taf Fechan * 4 Tributaries * 4.1 Nant Ffrwd * 4.2 Nant Morlais and Nant Rhydycar * 4.3 Taff Bargoed, Cynon, Nant Clydach and Rhondda * 5 Mouth of the Taff * 6 "Taffy" * 7 See also * 8 References * 9 External links COURSEFrom its confluence at Cefn-coed-y-cymmer, the river flows south, passing several towns
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Llwyn-on Reservoir
LLWYN-ON RESERVOIR is the largest and southernmost of the three reservoirs in the Taff Fawr valley in South Wales
South Wales
. It is owned by Welsh Water . It is located in the Brecon Beacons National Park . The eastern half is in the Merthyr Tydfil
Merthyr Tydfil
unitary authority area and the western half is in the Rhondda Cynon Taff
Rhondda Cynon Taff
unitary authority area. The reservoir is within the historic county boundaries of Breconshire . The dam is adjacent to Llwyn-On village . Nant Gwinau , Nant Car and Garwnant are the major streams that enter the reservoir. To the east of the reservoir is the 462m mountain of Garn Ddu , and to the west is the 485m mountain of Cadair Fawr
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Road Roller
A ROAD ROLLER (sometimes called a roller-compactor, or just roller) is a compactor type engineering vehicle used to compact soil , gravel , concrete , or asphalt in the construction of roads and foundations . Similar rollers are used also at landfills or in agriculture. In some parts of the world, road rollers are still known colloquially as steam rollers , regardless of their method of propulsion
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Turbidity
TURBIDITY is the cloudiness or haziness of a fluid caused by large numbers of individual particles that are generally invisible to the naked eye , similar to smoke in air . The measurement of turbidity is a key test of water quality . Fluids can contain suspended solid matter consisting of particles of many different sizes. While some suspended material will be large enough and heavy enough to settle rapidly to the bottom of the container if a liquid sample is left to stand (the settable solids ), very small particles will settle only very slowly or not at all if the sample is regularly agitated or the particles are colloidal . These small solid particles cause the liquid to appear turbid. TURBIDITY (or haze) is also applied to transparent solids such as glass or plastic. In plastic production, haze is defined as the percentage of light that is deflected more than 2.5° from the incoming light direction
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River Thames
The RIVER THAMES (/tɛmz/ ( listen ) TEMZ ) is a river that flows through southern England
England
, most notably through London. At 215 miles (346 km), it is the longest river entirely in England
England
and the second longest in the United Kingdom , after the River Severn . It also flows through Oxford
Oxford
(where it is called Isis ), Reading , Henley-on-Thames and Windsor . The lower reaches of the river are called the Tideway
Tideway
, derived from its long tidal reach up to Teddington Lock . It rises at Thames Head
Thames Head
in Gloucestershire, and flows into the North Sea via the Thames Estuary . The Thames drains the whole of Greater