80-504: Chasewater is a reservoir located in the parish of Burntwood and the district of Lichfield in Staffordshire, England. Originally known as Norton Pool and Cannock Chase Reservoir, it was created as a canal feeder reservoir in 1797. The reservoir was created to directly supply the Wyrley and Essington Canal and maintain levels in the 160-mile (260 km) Birmingham Canal Network . During
160-479: A heritage railway . The line is approximately 2 miles (3.2 km) in length, contained entirely within Chasewater Country Park. The route, which forms a horse-shoe shape around the lake, passes through heathland, including a Site of Special Scientific Interest , and passes over a 1 ⁄ 4 -mile (0.40 km) long causeway . Prior to preservation, the line was part of the network operated by
240-537: A block for migrating fish, trapping them in one area, producing food and a habitat for various water-birds. They can also flood various ecosystems on land and may cause extinctions. Creating reservoirs can alter the natural biogeochemical cycle of mercury . After a reservoir's initial formation, there is a large increase in the production of toxic methylmercury (MeHg) via microbial methylation in flooded soils and peat. MeHg levels have also been found to increase in zooplankton and in fish. Dams can severely reduce
320-457: A capacity of 4,400,000m (4.4 billion litres) and a surface area of 1.08 km (270 acres) with a maximum water depth of 11.3 metres (37 ft) near its eastern end. Chasewater is the third largest reservoir in Staffordshire by capacity and second by surface area. The Chasewater habitat supports several rare plant and animal species including: floating water-plantain ( Luronium natans ), round-leaved wintergreen ( Pyrola rotundifolia ),
400-791: A chain up the valley. Coastal reservoirs are fresh water storage reservoirs located on the sea coast near a river mouth to store the flood water of a river. As the land-based reservoir construction is fraught with substantial land submergence, coastal reservoirs are preferred economically and technically since they do not use scarce land area. Many coastal reservoirs were constructed in Asia and Europe. Saemanguem in South Korea, Marina Barrage in Singapore, Qingcaosha in China, and Plover Cove in Hong Kong are
480-636: A conventional oil-fired thermal generation plant. For instance, In 1990, the impoundment behind the Balbina Dam in Brazil (inaugurated in 1987) had over 20 times the impact on global warming than would generating the same power from fossil fuels, due to the large area flooded per unit of electricity generated. Another study published in the Global Biogeochemical Cycles also found that newly flooded reservoirs released more carbon dioxide and methane than
560-529: A drop of water seep into the ocean without benefiting mankind." He created the reservoir named Parakrama Samudra ("sea of King Parakrama"). Vast artificial reservoirs were also built by various ancient kingdoms in Bengal, Assam, and Cambodia. Many dammed river reservoirs and most bank-side reservoirs are used to provide the raw water feed to a water treatment plant which delivers drinking water through water mains. The reservoir does not merely hold water until it
640-525: A few such coastal reservoirs. Where water is pumped or siphoned from a river of variable quality or size, bank-side reservoirs may be built to store the water. Such reservoirs are usually formed partly by excavation and partly by building a complete encircling bund or embankment , which may exceed 6 km (4 miles) in circumference. Both the floor of the reservoir and the bund must have an impermeable lining or core: initially these were often made of puddled clay , but this has generally been superseded by
720-480: A heritage line. Following an inspection in 2006 it was discovered that remedial works were needed to the eastern dam. As a result of this the reservoir was drawn down 8 metres (26 ft) in spring 2010 for works to be complete by spring 2012. In May 2011 Staffordshire County Council took over ownership of the reservoir to ensure completion of the remedial works. Chasewater reservoir is retained by two earth embankment dams . The main eastern dam runs north-south along
800-455: A high-level reservoir is filled with water using high-performance electric pumps at times when electricity demand is low, and then uses this stored water to generate electricity by releasing the stored water into a low-level reservoir when electricity demand is high. Such systems are called pump-storage schemes. Reservoirs can be used in a number of ways to control how water flows through downstream waterways: Reservoirs can be used to balance
880-414: A little further up the shore. By the early 1960s the sailing club moved to its present position and a funfair etc. was set up on the south shore, in 1961 the pier and the castle were built along the south shore. The 1960s saw the final rail traffic passing over the causeway and the final coal barge leaving Anglesey Basin. In 1984 a Chasewater Master Plan and Development Strategy was published, which recognised
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#1733086191974960-570: A loss in both quantity and quality of water necessary for maintaining ecological balance and pose a risk of increasing severity and duration of droughts due to climate change. In summary, they consider it a misadaptation to climate change. Proponents of reservoirs or substitution reserves, on the other hand, see them as a solution for sustainable agriculture while waiting for a truly durable agricultural model. Without such reserves, they fear that unsustainable imported irrigation will be inevitable. They believe that these reservoirs should be accompanied by
1040-419: A narrow valley or canyon may cover relatively little vegetation, while one situated on a plain may flood a great deal of vegetation. The site may be cleared of vegetation first or simply flooded. Tropical flooding can produce far more greenhouse gases than in temperate regions. The following table indicates reservoir emissions in milligrams per square meter per day for different bodies of water. Depending upon
1120-554: A new bridge over the motorway to access the southern side of the lake, where an Innovation Centre provides enhanced access to the waterfront. Selling land for motorway construction also allowed the Chasewater Railway to construct new premises and a large engine shed on the lake side. In June 2019, a parkrun (a free, weekly timed 5 km run/walk) event started at Chasewater, taking place every Saturday morning at 9am. Following an inspection in 2006 and further investigations in
1200-458: A period of great industrial growth in the Black Country region the maintenance of water levels in canal infrastructure was essential and Chasewater was in great demand. As canals became less essential for transport of goods during the mid-20th century, the reservoir diversified and became a popular public amenity with activities such as water-skiing, sailing, wakeboarding and cycling. Chasewater
1280-592: A reservoir is called the "conservation pool". In the United Kingdom, "top water level" describes the reservoir full state, while "fully drawn down" describes the minimum retained volume. There is a wide variety of software for modelling reservoirs, from the specialist Dam Safety Program Management Tools (DSPMT) to the relatively simple WAFLEX , to integrated models like the Water Evaluation And Planning system (WEAP) that place reservoir operations in
1360-720: A river valley, with the potential to wash away towns and villages and cause considerable loss of life, such as the devastation following the failure of containment at Llyn Eigiau which killed 17 people. (see also List of dam failures ) A notable case of reservoirs being used as an instrument of war involved the British Royal Air Force Dambusters raid on Germany in World War II (codenamed " Operation Chastise " ), in which three German reservoir dams were selected to be breached in order to damage German infrastructure and manufacturing and power capabilities deriving from
1440-574: A territorial project that unites all water stakeholders with the goal of preserving and enhancing natural environments. Two main types of reservoirs can be distinguished based on their mode of supply. Circa 3000 BC, the craters of extinct volcanoes in Arabia were used as reservoirs by farmers for their irrigation water. Dry climate and water scarcity in India led to early development of stepwells and other water resource management techniques, including
1520-471: Is a natural lake whose level was raised by a low dam and into which the River Dee flows or discharges depending upon flow conditions, as part of the River Dee regulation system . This mode of operation is a form of hydraulic capacitance in the river system. Many reservoirs often allow some recreational uses, such as fishing and boating . Special rules may apply for the safety of the public and to protect
1600-480: Is a water reservoir for agricultural use. They are filled using pumped groundwater , pumped river water or water runoff and are typically used during the local dry season. This type of infrastructure has sparked an opposition movement in France, with numerous disputes and, for some projects, protests, especially in the former Poitou-Charentes region where violent demonstrations took place in 2022 and 2023. In Spain, there
1680-437: Is also used technically to refer to certain forms of liquid storage, such the "coolant reservoir" that captures overflow of coolant in an automobile's cooling system. Dammed reservoirs are artificial lakes created and controlled by a dam constructed across a valley and rely on the natural topography to provide most of the basin of the reservoir. These reservoirs can either be on-stream reservoirs , which are located on
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#17330861919741760-399: Is an enlarged lake behind a dam , usually built to store fresh water , often doubling for hydroelectric power generation . Reservoirs are created by controlling a watercourse that drains an existing body of water, interrupting a watercourse to form an embayment within it, excavating, or building any number of retaining walls or levees to enclose any area to store water. The term
1840-501: Is greater acceptance because all beneficiary users are involved in the implementation of the system. The specific debate about substitution reservoirs is part of a broader discussion related to reservoirs used for agricultural irrigation, regardless of their type, and a certain model of intensive agriculture. Opponents view these reservoirs as a monopolization of resources benefiting only a few, representing an outdated model of productive agriculture. They argue that these reservoirs lead to
1920-466: Is needed: it can also be the first part of the water treatment process. The time the water is held before it is released is known as the retention time . This is a design feature that allows particles and silts to settle out, as well as time for natural biological treatment using algae , bacteria and zooplankton that naturally live in the water. However natural limnological processes in temperate climate lakes produce temperature stratification in
2000-528: Is now used by the Aquarius Golf Club. Service reservoirs perform several functions, including ensuring sufficient head of water in the water distribution system and providing water capacity to even-out peak demand from consumers, enabling the treatment plant to run at optimum efficiency. Large service reservoirs can also be managed to reduce the cost of pumping by refilling the reservoir at times of day when energy costs are low. An irrigation reservoir
2080-419: Is stored in the reservoir. Any excess water can be spilled via a specifically designed spillway. Stored water may be piped by gravity for use as drinking water , to generate hydro-electricity or to maintain river flows to support downstream uses. Occasionally reservoirs can be managed to retain water during high rainfall events to prevent or reduce downstream flooding. Some reservoirs support several uses, and
2160-511: Is the Chasewater Railway . The large house situated halfway along the dam wall was originally the weir master's cottage. The weir master would walk up to the hexagonal valve house, constructed to the same design as BCN tollhouses, and operate the gate valves to release water from Chasewater reservoir into the canal. The construction of the M6 Toll between the reservoir and the A5 required the construction of
2240-480: Is the third largest reservoir by volume in the county of Staffordshire and the largest canal feeder reservoir in the West Midlands . An act of Parliament, the Wyrley and Essington Canal Act 1794 ( 34 Geo. 3 . c. 25), received royal assent on 28 March 1794, entitled "An Act for extending the Wyrley and Essington Canal " , this authorised a long extension, from Sneyd past Lichfield to Huddlesford Junction on
2320-466: Is the portion of the reservoir that can be used for flood control, power production, navigation , and downstream releases. In addition, a reservoir's "flood control capacity" is the amount of water it can regulate during flooding. The "surcharge capacity" is the capacity of the reservoir above the spillway crest that cannot be regulated. In the United States, the water below the normal maximum level of
2400-628: The Coventry Canal , together with the raising of up to £115,000 to complete construction. As part of the act the Wyrley and Essington Canal Company were required to provide a water source to keep the new length of canal topped up. A site in the Crane Brook Valley was selected to be dammed to create a reservoir which would provide water to the new stretch of canal. Excavations started in the valley floor in 1796 and were used to build earthwork dams along
2480-573: The NCB to serve the coalfields of the Cannock Chase area. The exchange sidings, where the colliery line connected with the Midland Railway , were situated about 1 ⁄ 4 mile (0.40 km) north of the current Brownhills West Station. Significant changes happened in 2002/2003 caused by the closure of the original Brownhills West station due to the building of the M6 Toll motorway. This led to
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2560-448: The Ruhr and Eder rivers. The economic and social impact was derived from the enormous volumes of previously stored water that swept down the valleys, wreaking destruction. This raid later became the basis for several films. All reservoirs will have a monetary cost/benefit assessment made before construction to see if the project is worth proceeding with. However, such analysis can often omit
2640-407: The carnivorous round-leaved sundew ( Drosera rotundifolia ), adder's tongue ( Ophioglossum ), black spleenwort ( Asplenium adiantum-nigrum ), goldeneye duck ( Bucephala ) and tufted duck ( Aythya fuligula ) The surrounding area is designated as a country park. The reservoir hosts a variety of activities including water skiing , sailing, angling and bird watching. Running around Chasewater
2720-646: The 1800s, most of which are lined with brick. A good example is the Honor Oak Reservoir in London, constructed between 1901 and 1909. When it was completed it was said to be the largest brick built underground reservoir in the world and it is still one of the largest in Europe. This reservoir now forms part of the southern extension of the Thames Water Ring Main . The top of the reservoir has been grassed over and
2800-655: The Anglesey Branch at the toe of the dam. After barely eight years of operation the colliery last drew coal in January 1857, as it became impossible to work due to the influx of sand and gravel caused by working too close to unconsolidated surface deposits. Many other collieries were opened at this time around the reservoir and continued to be mined into the 20th century. After the opening of the South Staffordshire Railway Line in 1849 rail infrastructure serving
2880-463: The March 1800 the dam had been rebuilt by Thomas Dadford and the reservoir refilled. A watch house was built by the canal company with a full-time watchman to safeguard against any similar incidents in the future. In 1840 ownership of the reservoir passed to Birmingham Canal Navigations after the company acquired the Wyrley and Essington Canal Company. During the mid-19th century the coal deposits beneath
2960-710: The Meroitic town of Butana . The Hafirs catch the water during rainy seasons in order to ensure water is available for several months during dry seasons to supply drinking water, irrigate fields and water cattle. The Great Reservoir near the Lion Temple in Musawwarat es-Sufra is a notable hafir in Kush. In Sri Lanka , large reservoirs were created by ancient Sinhalese kings in order to store water for irrigation. The famous Sri Lankan king Parākramabāhu I of Sri Lanka said "Do not let
3040-485: The US. The capacity, volume, or storage of a reservoir is usually divided into distinguishable areas. Dead or inactive storage refers to water in a reservoir that cannot be drained by gravity through a dam's outlet works , spillway, or power plant intake and can only be pumped out. Dead storage allows sediments to settle, which improves water quality and also creates an area for fish during low levels. Active or live storage
3120-505: The amount of water reaching countries downstream of them, causing water stress between the countries, e.g. the Sudan and Egypt , which damages farming businesses in the downstream countries, and reduces drinking water. Chasewater Railway The Chasewater Railway is a former colliery railway running round the shores of Chasewater in Staffordshire , England . It is now operated as
3200-523: The area flooded versus power produced, a reservoir built for hydro- electricity generation can either reduce or increase the net production of greenhouse gases when compared to other sources of power. A study for the National Institute for Research in the Amazon found that hydroelectric reservoirs release a large pulse of carbon dioxide from decay of trees left standing in the reservoirs, especially during
3280-428: The base of the dam or some distance away. In a flat river valley a reservoir needs to be deep enough to create a head of water at the turbines; and if there are periods of drought the reservoir needs to hold enough water to average out the river's flow throughout the year(s). Run-of-the-river hydro in a steep valley with constant flow needs no reservoir. Some reservoirs generating hydroelectricity use pumped recharge:
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3360-472: The building of a causeway across the Crane Brook valley at the western end of the reservoir. Subsidence in the 1890s led to the extension of the western embankment north to the railway causeway and Norton East Road. In the late 19th and early 20th centuries the eastern dam was raised, with this a new hexagonal valve house and weir was built and the capacity of the reservoir was increased. The increased capacity of
3440-547: The building of a reservoir at Girnar in 3000 BC. Artificial lakes dating to the 5th century BC have been found in ancient Greece. The artificial Bhojsagar lake in present-day Madhya Pradesh state of India, constructed in the 11th century, covered 650 square kilometres (250 sq mi). The Kingdom of Kush invented the Hafir , a type of reservoir, during the Meroitic period . 800 ancient and modern hafirs have been registered in
3520-476: The burst was not clear however it was likely that no overflow system was provided and a summer storm caused the dam to overtop and erode the earth embankment. The flood wave caused significant damage with roads and bridges destroyed, fields flooded and livestock killed. The canal company paid out compensation to all who had suffered losses and set about rebuilding the dam. The dam was rebuilt thicker and wider than previously with its inner faces lined with limestone. In
3600-425: The capacity of the reservoir. The dam was raised by approximately 1.5 metres (4.9 ft), a new bridge was built across the outflow basin above the old one, a new valve house was constructed on the raised crest and a 3 feet (0.91 m) wave wall was built along the crest. The western dam stretches from approximately 300 metres (980 ft) north of Brownhills West station to Norton East Road. The embankment dams
3680-814: The collieries around the reservoir began to expand. John Robinson McClean engineered the rail line linking the South Staffordshire Line to the Hammerwich and Uxbridge Collieries as well as the Norton Branch. McClean leased pits from the Marquess of Anglesey and formed the Cannock Chase Colliery Company in 1859. In 1871 the rail line linking the Norton Branch and the Uxbridge Colliery was built. This line, now used by Chasewater Railway , involved
3760-442: The context of system-wide demands and supplies. In many countries large reservoirs are closely regulated to try to prevent or minimize failures of containment. While much of the effort is directed at the dam and its associated structures as the weakest part of the overall structure, the aim of such controls is to prevent an uncontrolled release of water from the reservoir. Reservoir failures can generate huge increases in flow down
3840-548: The dam located at the narrowest practical point to provide strength and the lowest cost of construction. In many reservoir construction projects, people have to be moved and re-housed, historical artifacts moved or rare environments relocated. Examples include the temples of Abu Simbel (which were moved before the construction of the Aswan Dam to create Lake Nasser from the Nile in Egypt ),
3920-423: The dam. To meet regulations the reservoir has to be able to withstand a 1 in 10,000-year storm event. To increase the overflow capacity culverts were installed through the causeway carrying Chasewater Railway , this was to increase water flows from Jeffries Swag into the main body of the reservoir. A new bridge, weir and spillway were built at the southeastern end of the reservoir. The drawdown culvert which runs from
4000-460: The developed world Naturally occurring lakes receive organic sediments which decay in an anaerobic environment releasing methane and carbon dioxide . The methane released is approximately 8 times more potent as a greenhouse gas than carbon dioxide. As a human-made reservoir fills, existing plants are submerged and during the years it takes for this matter to decay, will give off considerably more greenhouse gases than lakes do. A reservoir in
4080-507: The downstream river to maintain river quality, support fisheries, to maintain downstream industrial and recreational uses or for a range of other purposes. Such releases are known as compensation water . The units used for measuring reservoir areas and volumes vary from country to country. In most of the world, reservoir areas are expressed in square kilometers; in the United States, acres are commonly used. For volume, either cubic meters or cubic kilometers are widely used, with acre-feet used in
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#17330861919744160-472: The eastern and western edges of the reservoir. A feeder channel to supply water to the canal was cut through from the eastern dam to the top of the locks at Ogley Hay 1.5 miles (2.4 km) to the south east. The reservoir opened on 8 May 1797, however in June 1799 the eastern dam burst releasing a flood wave downstream along the Crane Brook Valley towards Shenstone , about 4.5 miles to the south east. The cause of
4240-419: The eastern side of the reservoir and is 560 metres (1,840 ft) long with a maximum height of 14 metres (46 ft), a crest width of 15 metres (49 ft) and maximum width at its base of 70 metres (230 ft). The secondary western dam is a continuous embankment along the western side of the reservoir and is 1,300 metres (4,300 ft) long with a maximum height of 4 metres (13 ft). The eastern dam
4320-440: The environmental impacts of dams and the reservoirs that they contain. Some impacts, such as the greenhouse gas production associated with concrete manufacture, are relatively easy to estimate. Other impacts on the natural environment and social and cultural effects can be more difficult to assess and to weigh in the balance but identification and quantification of these issues is now commonly required in major construction projects in
4400-491: The first decade after flooding. This elevates the global warming impact of the dams to levels much higher than would occur by generating the same power from fossil fuels . According to the World Commission on Dams report (Dams And Development), when the reservoir is relatively large and no prior clearing of forest in the flooded area was undertaken, greenhouse gas emissions from the reservoir could be higher than those of
4480-413: The flow in highly managed systems, taking in water during high flows and releasing it again during low flows. In order for this to work without pumping requires careful control of water levels using spillways . When a major storm approaches, the dam operators calculate the volume of water that the storm will add to the reservoir. If forecast storm water will overfill the reservoir, water is slowly let out of
4560-481: The headwaters of streams which formerly flowed westwards to discharge into the River Penk . The dam was constructed between 1796 and 1797 with excavated materials from the reservoir bed, however it was extended northwards in the 1890s to counteract the settlement of the land due to mining subsidence . The extended section of the dam was formed with tipped material containing burnt clay and a core of clay puddle . South of
4640-580: The hydroelectric reservoirs there do emit greenhouse gases, it is on a much smaller scale than thermal power plants of similar capacity. Hydropower typically emits 35 to 70 times less greenhouse gases per TWh of electricity than thermal power plants. A decrease in air pollution occurs when a dam is used in place of thermal power generation, since electricity produced from hydroelectric generation does not give rise to any flue gas emissions from fossil fuel combustion (including sulfur dioxide , nitric oxide and carbon monoxide from coal ). Dams can produce
4720-432: The landscape is relatively flat. Other service reservoirs can be storage pools, water tanks or sometimes entirely underground cisterns , especially in more hilly or mountainous country. Modern reserviors will often use geomembrane liners on their base to limit seepage and/or as floating covers to limit evaporation, particularly in arid climates. In the United Kingdom, Thames Water has many underground reservoirs built in
4800-470: The modern use of rolled clay. The water stored in such reservoirs may stay there for several months, during which time normal biological processes may substantially reduce many contaminants and reduce turbidity . The use of bank-side reservoirs also allows water abstraction to be stopped for some time, for instance when the river is unacceptably polluted or when flow conditions are very low due to drought . The London water supply system exhibits one example of
4880-406: The nature conservation value of Chasewater and the surrounding land. In 1994 Lichfield District Council became responsible for management of Chasewater and the site became a country park in 1998. Continued investment in the nature and leisure value at Chasewater led to the building of the £1.9 million Forest of Mercia Innovation Centre in 2000 and the restoration of the Chasewater Railway as
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#17330861919744960-593: The new top water level exceeds the watershed height on one or more of the feeder streams such as at Llyn Clywedog in Mid Wales . In such cases additional side dams are required to contain the reservoir. Where the topography is poorly suited to forming a single large reservoir, a number of smaller reservoirs may be constructed in a chain, as in the River Taff valley where the Llwyn-on , Cantref and Beacons Reservoirs form
5040-415: The operating rules may be complex. Most modern reservoirs have a specially designed draw-off tower that can discharge water from the reservoir at different levels, both to access water as the water level falls, and to allow water of a specific quality to be discharged into the downstream river as "compensation water": the operators of many upland or in-river reservoirs have obligations to release water into
5120-428: The original streambed of the downstream river and are filled by creeks , rivers or rainwater that runs off the surrounding forested catchments, or off-stream reservoirs , which receive diverted water from a nearby stream or aqueduct or pipeline water from other on-stream reservoirs. Dams are typically located at a narrow part of a downstream of a natural basin. The valley sides act as natural walls, with
5200-477: The pre-flooded landscape, noting that forest lands, wetlands, and preexisting water features all released differing amounts of carbon dioxide and methane both pre- and post-flooding. The Tucuruí Dam in Brazil (completed in 1984) had only 0.4 times the impact on global warming than would generating the same power from fossil fuels. A two-year study of carbon dioxide and methane releases in Canada concluded that while
5280-437: The quality of the water and the ecology of the surrounding area. Many reservoirs now support and encourage less formal and less structured recreation such as natural history , bird watching , landscape painting , walking and hiking , and often provide information boards and interpretation material to encourage responsible use. Water falling as rain upstream of the reservoir, together with any groundwater emerging as springs,
5360-407: The railway causeway the dam was widened when the area was landscaped using colliery waste as fill, it now does not resemble a dam although it still acts as one. The extension of the western dam allowed the overflow to be raised on the eastern dam in the late 19th century. This increased the capacity of the reservoir and created Jeffries Swag on the north side of the railway causeway. The reservoir has
5440-588: The rebuilding of Brownhills West slightly north of the old station with significantly improved facilities, including a new carriage shed and heritage centre, and completion of the Chasetown section of the line (the 'Chasetown Extension Railway' between Chasewater Heaths and Chasetown Church Street). In 2016 the Railway was awarded The Queens Award for Voluntary Services. The buildings at Brownhills West house Chasewater Railway Museum . Volunteers are working to establish
5520-464: The relocation of the village of Capel Celyn during the construction of Llyn Celyn , and the relocation of Borgo San Pietro of Petrella Salto during the construction of Lake Salto . Construction of a dammed reservoir will usually require the river to be diverted during part of the build, often through a temporary tunnel or by-pass channel. In hilly regions, reservoirs are often constructed by enlarging existing lakes. Sometimes in such reservoirs,
5600-597: The reservoir and the surrounding area began to be mined on a large scale due to the Industrial Revolution . The landowner of the area, the Marquess of Anglesey planned to open pits near to the reservoir. The Anglesey Branch of the Wyrley and Essington Canal was constructed between 1848 and 1850 and made the existing feeder channel navigable. In 1849 the marquess opened the Hammerwich Colliery, located adjacent to
5680-578: The reservoir bed to the canal was inspected and restored for the first time in 200 years. The £5.5 million repairs were completed in April 2012. When the water was lowered, two suspected bombs were discovered on the reservoir bed, these were later determined to be mortar rounds dating from the Second World War . Reservoir (water) A reservoir ( / ˈ r ɛ z ər v w ɑːr / ; from French réservoir [ʁezɛʁvwaʁ] )
5760-410: The reservoir created Jeffries Swag at the western end of the reservoir. Under the terms of an act of Parliament authoring abandonment obtained in 1954, most of the branches of the original Wyrley and Essington Canal were closed, including the branch from Ogley to Huddlesford , which was abandoned in 1955. The closing of this section of canal reduced the demand for water from Chasewater. On 21 Oct 1957
5840-627: The reservoir prior to, and during, the storm. If done with sufficient lead time, the major storm will not fill the reservoir and areas downstream will not experience damaging flows. Accurate weather forecasts are essential so that dam operators can correctly plan drawdowns prior to a high rainfall event. Dam operators blamed a faulty weather forecast on the 2010–2011 Queensland floods . Examples of highly managed reservoirs are Burrendong Dam in Australia and Bala Lake ( Llyn Tegid ) in North Wales . Bala Lake
5920-475: The reservoir was purchased by Brownhills Urban District Council from the British Transport Commission for £5,600 and the reservoir was renamed Chasewater. During the mid-20th century the majority of mines were closed around Chasewater and the area was becoming increasingly used for leisure purposes. In the early 1950s sailing dinghies were the first to arrive, subsequently speedboats joined them
6000-493: The use of bank-side storage: here water is taken from the River Thames and River Lee into several large Thames-side reservoirs, such as Queen Mary Reservoir that can be seen along the approach to London Heathrow Airport . Service reservoirs store fully treated potable water close to the point of distribution. Many service reservoirs are constructed as water towers , often as elevated structures on concrete pillars where
6080-412: The water, which tends to partition some elements such as manganese and phosphorus into deep, cold anoxic water during the summer months. In the autumn and winter the lake becomes fully mixed again. During drought conditions, it is sometimes necessary to draw down the cold bottom water, and the elevated levels of manganese in particular can cause problems in water treatment plants. In 2005, about 25% of
6160-431: The works. The county council maintained the principal contractor and appointed civil engineers, URS to complete the works. The water level in the reservoir was lowered by 8 metres (26 ft) from February to April in 2010, in order for the works to be carried out on the eastern dam. To reduce the risk of internal erosion filters were installed at the downstream toe of the embankment to control and monitor seepage through
6240-476: The world's 33,105 large dams (over 15 metres in height) were used for hydroelectricity. The U.S. produces 3% of its electricity from 80,000 dams of all sizes. An initiative is underway to retrofit more dams as a good use of existing infrastructure to provide many smaller communities with a reliable source of energy. A reservoir generating hydroelectricity includes turbines connected to the retained water body by large-diameter pipes. These generating sets may be at
6320-476: The years that followed, it was decided that maintenance works were needed to the eastern dam. The threats to the dam included internal erosion and overtopping of the dam during a storm event. Lichfield District Council appointed Galliford Try as principal contractor for works to start in December 2010. In May 2011 ownership of the reservoir passed to Staffordshire County Council to ensure successful completion of
6400-457: Was constructed between 1796 and 1797 across the Crane Brook valley damming Crane Brook; a tributary of the River Tame . The dam was constructed with the boulder clay and alluvium excavated from the reservoir bed. Later additions to the dam are formed with colliery waste from mining activity in the area. The overflow level of the dam was raised in the late 19th and early 20th centuries to increase
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