112-693: Rutland Water is a reservoir in Rutland , England, east of Rutland's county town, Oakham . It is filled by pumping from the River Nene and River Welland , and provides water to the East Midlands . By surface area it is the largest reservoir in England, but its capacity is exceeded by that of Kielder Water in Northumberland . Its maximum depth is 33m (108 ft). Set in 3,100 acres (13 km) of countryside, it has
224-402: A citizen science project used by ornithologists to document trends in bird populations, it allows birders see recent reports by other birders and search by species and location. Some species, including endangered species and others likely to be disrupted by increased human activity, are designated "sensitive species" by eBird and have locations of sightings hidden from the general public. As
336-479: A country list , state list , county list , yard list , year list , or any combination of these. The early interest in observing birds for their aesthetic rather than utilitarian (mainly food) value is traced to the late 18th century in the works of Gilbert White , Thomas Bewick , George Montagu and John Clare . The study of birds, and of natural history in general, became increasingly prevalent in Britain during
448-404: A golden-winged warbler ( Vermivora chrysoptera ), which is native to North America. Twitchers have developed their own vocabulary . For example, a twitcher who fails to see a rare bird has dipped out ; if other twitchers do see the bird, they may feel gripped off . Suppression is the act of concealing news of a rare bird from other twitchers. Many birders maintain a life list , that is,
560-470: A spotting scope with tripod , a smartphone , a notepad, and one or more field guides . Hides (known as blinds in North America) or observation towers are often used to conceal the observers from birds, and/or to improve viewing conditions. Virtually all optics manufacturers offer specific binoculars for birding, and some have even geared their whole brand to birders. Recognition of bird vocalizations
672-403: A 23-mile (37 km) perimeter track, (17-mile (27 km) excluding Hambleton Peninsula ) for walking or cycling. Since the water is drawn upon when needed, the relative areas of land and water vary a little, but the flatter parts of the lake margin are enclosed by banks so that the wetland nature reserve is maintained ( grid reference SK886073 ). A 1,555 hectare area of lake and shore
784-537: 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
896-791: 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
1008-636: 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
1120-477: A distance away from nests and nesting colonies, and respecting private property. The lack of definite evidence, except arguably in the form of photographs, makes birding records difficult to prove but birdwatchers strive to build trust in their identification. One of the few major disputes was the case of the Hastings Rarities . Ethologist Nikolaas Tinbergen considers birdwatching to be an expression of
1232-529: 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
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#17328487988091344-525: 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
1456-455: 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
1568-559: A list of all of the species they have seen in their life, usually with details about the sighting such as date and location. The American Birding Association has specific rules about how a bird species may be documented and recorded in such a list if it is submitted to the ABA; however, the criteria for the personal recording of these lists are very subjective. Some birders "count" species they have identified audibly, while others only record species that they have identified visually. Some also maintain
1680-414: A list. The term originated in the 1950s, when it was used to describe the nervous behaviour of Howard Medhurst, a British birdwatcher. Earlier terms for those who chased rarities were pot-hunter , tally-hunter , or tick-hunter . The main goal of twitching is often to accumulate species on one's lists. Some birders engage in competition to accumulate the longest species list. The act of the pursuit itself
1792-570: 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
1904-484: A major business, with at least 127 companies offering tours worldwide. An average trip to a less-developed country costs $ 4,000 per person and includes about 12 participants for each of 150 trips a year. It has been suggested that this economic potential needs to be tapped for conservation. Birdwatching tourism is considered to be one of the fastest-growing nature-based tourism sectors in the world, often involving well-educated or wealthy travelers with specific interests in
2016-801: A minimum of 10% of its net profits to bird conservation and communities it operates in. Another tour operator, Hardy Boat, has donated $ 200,000 to Project Puffin to conserve puffin populations off the Atlantic Coast. One of the expectations of ecotourism is that the travels of birders to a place will contribute to the improvement of the local economy, ensuring that the environment is valued and protected. Birdwatchers contribute to conservation, helping build and disseminate environmental knowledge by participating in citizen science. However, birding can bring about an increased penetration of ecosystem services that are perceived as birdwatchers' indispensable attributes. By their presence and obstinacy, birdwatchers affect
2128-585: A more limited scope, perhaps not venturing far from their own yards or local parks to view birds. Indeed, in 1969 a Birding Glossary appeared in Birding magazine which gave the following definitions: Birder . The acceptable term used to describe the person who seriously pursues the hobby of birding. May be professional or amateur. Birding . A hobby in which individuals enjoy the challenge of bird study, listing, or other general activities involving bird life. Bird-watcher . A rather ambiguous term used to describe
2240-449: A much more widespread aspect of the hobby. As with the arrival of affordable digital cameras , the development of more compact and affordable digital video cameras has made them more attractive and accessible to the birding community. Cross-over, non-linear digital models now exist that take high-quality stills at acceptable resolutions, as well as being able to record and play audio and video. The ability to capture and reproduce not only
2352-419: 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
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#17328487988092464-499: A net input to the lake but its flow downstream is maintained. Most of the stored water is extracted from the River Welland at grid reference TF017060 , between Tinwell and Stamford , and from the River Nene upstream from Peterborough , a city which is a major user of the water. Because much of the valley is clay, material for the dam was extracted from pits dug within the area that would be subsequently flooded. The clay dam
2576-408: A part of birding, but in the past the cost of cameras with super-telephoto lenses made this a minority, often semi-professional, interest. The advent of affordable digital cameras , which can be used in conjunction with a spotting scope or binoculars (using the technique of afocal photography , referred to by the neologism " digiscoping " or sometimes digibinning for binoculars), have made this
2688-609: A possibility for a large number of people towards the 1980s. The need for global guides to birds increased, and one of the biggest resulting projects was the Handbook of the Birds of the World , begun in the 1990s by Josep del Hoyo, Jordi Sargatal, David A. Christie, and ornithologist Andy Elliott. Initially, birdwatching was largely restricted to developed countries such as the United Kingdom and
2800-535: 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
2912-720: 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
3024-580: A skeleton measuring about 10 metres in length and a skull weighing about a tonne, is the largest and most complete fossil of its kind found in the UK. The Anglian Water Birdwatching Centre, located in Egleton , features a gift shop operated by Anglian Water and a shop selling binoculars and telescopes. The centre includes the Rutland Environmental Education Centre, exhibits, and windows overlooking
3136-574: 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
3248-576: A useful tool for environmental education and awareness of environmental issues. Birdwatching can increase respect for nature and awareness of the fragility of ecosystems . Birding as a competitive event is organized in some parts of the world. Such competitions encourage individuals or teams to accumulate large numbers of species within a specified time or area with special rules. Some birdwatchers will also compete by attempting to increase their life list, national list, state list, provincial list, county list, or year list . The American Birding Association
3360-439: A visual enhancement device such as binoculars or a telescope , by listening for bird sounds, watching public webcams , or by viewing smart bird feeder cameras. Most birdwatchers pursue this activity for recreational or social reasons, unlike ornithologists , who engage in the study of birds using formal scientific methods. The first recorded use of the term birdwatcher was in 1712 by William Oldsworth. The term birding
3472-427: Is 115 feet (35 m) high, and around 1,300 yards (1,200 m) long. At its base, it is up to 890 yards (810 m) wide, and the finished structure has been landscaped to blend in with the environment, even when viewed from Empingham, the nearest village. Rutland Water contains a limnological tower for study of the reservoir's ecological conditions. Upper Hambleton and the remnant of Middle Hambleton, including
Rutland Water - Misplaced Pages Continue
3584-591: Is a biological Site of Special Scientific Interest , and a Nature Conservation Review site. An area of 1,333 hectares is an internationally important wetland site under the Ramsar Convention , and 393 hectares at the western end is managed by the Leicestershire and Rutland Wildlife Trust . The reservoir's construction, by damming the Gwash valley near Empingham , was completed in 1975. During its construction it
3696-471: 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
3808-480: 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
3920-437: 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
4032-399: 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
4144-424: Is an important part of a birder's toolkit. Sound information can assist in the locating, watching, identification, and sometimes sexing of birds. Recent developments in audio technology have seen recording and reproduction devices shrink in both size and price, making them accessible to a greater portion of the birding community. The non-linear nature of digital audio technology has also made selecting and accessing
4256-434: Is estimated that birdwatching ecotourism contributes $ 41 billion per year to the U.S. economy. The large funds generated by birdwatching ecotourism have been suggested as a replacement for tax revenue generated by bird hunting which has dropped to its lowest levels in decades. Birding ecotourism companies are also making contributions to conservation. Birding Ecotours, which runs both international and domestic trips, donates
4368-501: 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
4480-590: Is home to the Anglian Water Bird Watching Centre. Every August, the centre was the venue for the British Birdwatching Fair until 2019. Other birds found here include lapwing , coot , goldeneye , tufted duck , pochard , teal , wigeon , cormorant , great crested grebe , little grebe and, most notably, osprey , which were re-introduced to the area during 1996, including one called " Mr Rutland ". In 2021 there were 26 ospreys in
4592-466: 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
Rutland Water - Misplaced Pages Continue
4704-528: 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
4816-541: Is referred to as a twitch or a chase . A rare bird that stays long enough for people to see it is twitchable or chaseable . Twitching is highly developed in the United Kingdom, the Netherlands , Denmark , Ireland , Finland and Sweden . The size of these countries makes it possible to travel throughout them quickly and with relative ease. The most popular twitches in the UK have drawn large crowds; for example, approximately 2,500 people travelled to Kent , to view
4928-419: 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
5040-466: 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
5152-567: The Sibley Guide to Birds and the official Audubon Society app. Other apps utilize machine learning to automatically identifying birds from photographs and audio recordings, such as the Cornell Lab of Ornithology's Merlin Bird ID application and iNaturalist . Cornell Lab of Ornithology 's eBird database is a popular tool used by birders to document their sightings. In addition to serving as
5264-760: The American Birding Association and the Cornell Lab of Ornithology in North America. Many statewide or local Audubon organizations are also active in the United States, as are many provincial and local organizations in Canada. BirdLife International is an important global alliance of bird conservation organizations. Many countries and smaller regions (states/provinces) have "rarities committees" to check, accept or reject reports of rare birds made by birders. Equipment commonly used for birding includes binoculars ,
5376-479: The Christmas Bird Count , or follow carefully designed study protocols. This kind of citizen science can assist in identifying environmental threats to the well-being of birds or, conversely, in assessing outcomes of environmental management initiatives intended to ensure the survival of at-risk species or to encourage the breeding of species for aesthetic or ecological reasons. This more scientific side of
5488-448: 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
5600-461: The Victorian Era , often associated with collection , eggs and later skins being the artifacts of interest. Wealthy collectors made use of their contacts in the colonies to obtain specimens from around the world. It was only in the late 19th century that the call for bird protection led to the rising popularity of observations of living birds. The Audubon Society was started to protect birds from
5712-507: The World Wide Web , birders have been using the Internet to convey information; this can be via mailing lists , forums , bulletin-boards , web-based databases and other social media . While most birding lists are geographic in scope, there are special-interest lists that cater to bird-identification, 'twitchers', seabirds and raptor enthusiasts to name but a few. Messages can range from
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#17328487988095824-896: The 'scientification' of the pastime was 'undesirable'. This stand was to change only in 1936 when the RSPB was taken over by Tom Harrisson and others. Harrisson was instrumental in the organization of pioneering surveys of the great crested grebe . Increased mobility of birdwatchers ensured that books like Where to Watch Birds by John Gooders became best-sellers. By the 1960s air travel became feasible and long-distance holiday destinations opened up. By 1965, Britain's first birding tour company, Ornitholidays had been started by Lawrence Holloway. Travelling far away also led to problems in name usage: British birds such as "wheatear", "heron" and "swallow" needed adjectives to differentiate them in places where there were several related species. The falling cost of air travel made flying to remote birding destinations
5936-646: 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
6048-496: The Anglophone countries or Scandinavia. In the 20th century, most of the birding activity in North America was done on the east coast. The publication of Roger Tory Peterson's field guide in 1934 led to the initial increase in birding. Binoculars, an essential piece of birding equipment, became more easily available after World War II, making the hobby more accessible. The practice of travelling long distances to see rare bird species
6160-601: The Audubon Society, which was against the killing of birds, and the American Ornithologists' Union (AOU). The availability of first the bicycle and then the car increased the mobility of birdwatchers and this made new locations accessible. Networks of birdwatchers in the UK began to form in the late 1930s under the British Trust for Ornithology (BTO). The BTO saw the potential to produce scientific results through
6272-710: 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
6384-451: The Old Hall, are together now known simply as Hambleton and are to be found on a long peninsula in the middle of the lake, land that was formerly a ridge between the two valleys in which the lake now lies. The few houses of Normanton avoided flooding although its church did not. The lower part of the building was supported against water damage so that its upper part could be used to present
6496-467: The U.S. Fish and Wildlife Service in 2016, over 45 million Americans consider themselves birders. North American birders were estimated to have spent as much as US$ 32 billion in 2001. The spending is on the rise around the world. Kuşcenneti National Park (KNP) at Lake Manyas, a Ramsar site in Turkey, was estimated to attract birders who spent as much as US$ 103,320,074 annually. Guided bird tours have become
6608-561: The US was Birds through an Opera Glass (1889) by Florence Bailey . Birding in North America was focused in the early and mid-20th century in the eastern seaboard region, and was influenced by the works of Ludlow Griscom and later Roger Tory Peterson . Bird Neighbors (1897) by Neltje Blanchan , an early birding book, sold over 250,000 copies. It was illustrated with color photographs of stuffed birds. The organization and networking of those interested in birds began through organizations like
6720-511: The US), probably has the most subscribers, followed by the English-language fork of Eurobirdnet , Birding-Aus from Australia, SABirdnet from South Africa and Orientalbirding. The increasing availability of mobile devices in the 2010s allowed the smartphone to become a useful tool for birding. Mobile apps can be used as replacements for physical birding field guides, such as the digital version of
6832-440: 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
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#17328487988096944-540: The United States of America. Since the second half of the 20th century an increasing number of people in developing countries have engaged in this activity, such as in the Degua Tembien district of Ethiopia. Transnational birding has played an important role in this, as birders in developing countries usually take up the pastime under the influence of foreign cultures with a history of birding. A majority of transnational birders are middle-aged, male, affluent, and belong to
7056-553: The ability to store and play large quantities of information, pocket-sized devices allow a full birding multimedia library to be taken into the field and mobile Internet access makes obtaining and transmitting information possible in near real time. New technologies are allowing birdwatching activities to take place over the Internet, using robotic camera installations and mobile phones set up in remote wildlife areas. Projects such as CONE [1] allow users to observe and photograph birds over
7168-484: 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. Birdwatching Birdwatching , or birding , is the observing of birds , either as a recreational activity or as a form of citizen science . A birdwatcher may observe by using their naked eye, by using
7280-523: 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
7392-521: The area of Rutland Water. The lake is stocked with brown trout and rainbow trout, but there is a large head of coarse fish populated by water pumped in from the River Welland and River Nene, species include roach , bream , pike , zander , perch , eel , wels catfish and carp . In early 2021 an ichthyosaur fossil was discovered during the routine draining of a lagoon at the reservoir by nature reserve manager Joe Davis. A Temnodontosaurus with
7504-437: The attractiveness of the breeding migration or roosting sites for birds, flush birds, and otherwise increase the pressure on birds and their habitats (e.g., luring birds out of their hideouts and stressing them by playing their calls or exposing birds and their nests to predators). Furthermore, other impacts include disturbance to birds, the environment, local cultures and the economy. Methods to reduce negative impact and improve
7616-428: 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:
7728-485: The birds are more active and vocal making them easier to spot. Certain locations such as a local patch of forest, wetland and coast may be favoured according to the location and season. Seawatching , or pelagic birding, is a type of birding where observers based at a coastal watch point, such as a headland, watch birds flying over the sea. This is one form of pelagic birding, though birders also seek pelagic species from seagoing vessels. Weather plays an important role in
7840-547: 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
7952-442: 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
8064-548: 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 ),
8176-460: 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
8288-507: 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
8400-440: 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
8512-491: 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
8624-413: 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
8736-551: The growing trade in feathers in the United States while the Royal Society for the Protection of Birds began in Britain. The phrase "bird watching" appeared for the first time as the title of the book Bird Watching by Edmund Selous in 1901. In North America, the identification of birds, once thought possible only by shooting, was made possible by the emergence of optics and field identification guides. The earliest field guide in
8848-458: The hobby is an aspect of ornithology, coordinated in the UK by the British Trust for Ornithology . The Cornell Lab of Ornithology hosts many citizen-science projects to track the number and distribution of bird species across North America. These surveys help scientists note major changes from year to year which may occur as a result of climate change , disease, predation, and other factors. Because of their accessibility and ubiquity, birds are
8960-580: 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
9072-415: The lake. Birdwatching brings visitors from far afield. Large areas of wetland (as well as several small woods) at the western end of the lake form a nature reserve , managed by Leicestershire and Rutland Wildlife Trust . The area is designated a Special Protection Area of international importance for its wintering populations of gadwall (some 4% of this species’ European population) and shoveler . It
9184-432: 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
9296-483: The late 1980s. The income level of birders has been found to be well above average. The Sibley Guide to Birds , published in 2000, had sold 500,000 copies by 2002. It was found that the number of birdwatchers rose, but there appeared to be a drop in birdwatching in the backyard. According to a U.S. Fish and Wildlife Service study, birders contributed $ 36 billion to the US economy in 2006, and one fifth (20%) of all Americans are identified as birdwatchers. According to
9408-470: 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
9520-550: The networks, unlike the Royal Society for the Protection of Birds (RSPB) which like the Audubon Society originated from the bird protection movement. Like the AOU in North America, the BOU had a focus mainly on collection-based taxonomy. The BOU changed focus to ecology and behaviour only in the 1940s. The BTO movement towards 'organized birdwatching' was opposed by the RSPB, which claimed that
9632-593: 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
9744-403: The numbers of birdwatchers increases, there is growing concern about the impact of birdwatching on the birds and their habitat. Birdwatching etiquette is evolving in response to this concern. Some examples of birdwatching etiquette include promoting the welfare of birds and their environment, limiting use of photography, pishing and playback devices to mitigate stress caused to birds, maintaining
9856-417: The occurrence of rare birds. In Britain, suitable wind conditions may lead to drift migration , and an influx of birds from the east. In North America, birds caught in the tail-end of a hurricane may be blown inland. Birders may take part in censuses of bird populations and migratory patterns which are sometimes specific to individual species. These birdwatchers may also count all birds in a given area, as in
9968-415: 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
10080-428: 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
10192-432: The person who watches birds for any reason at all, and should not be used to refer to the serious birder. Twitching is a British term used to mean "the pursuit of a previously located rare bird." In North America, it is more often called chasing . The term twitcher , sometimes misapplied as a synonym for birder , is reserved for those who travel long distances to see a rare bird that would then be ticked , or counted on
10304-410: The places they visit. In addition to this, birdwatching tourism is considered a niche market of nature-based tourism. Birdwatching and other niche tourism markets are good for market diversification and mitigating the impacts of seasonality in a tourism market as well as bringing economic resources to remote communities, thus diversifying their economies and contributing to biodiversity conservation. It
10416-428: 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
10528-437: 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,
10640-508: The radio in Eric Simms' Countryside program but this did not catch on. In the 1960s people began using the telephone and some people became hubs for communication. In the 1970s some cafés, such as that in Cley, Norfolk run by Nancy Gull, became centers for meeting and communication. This was replaced by telephone hotline services such as "Birdline" and "Bird Information Service". With the advent of
10752-464: 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,
10864-536: The required recordings much more flexible than tape-based models. It is now possible to take a recording of every bird call you are likely to encounter in a given area out into the field stored on a device that will slip into your pocket and to retrieve calls for playback and comparison in any order you choose. As the technology continues to improve, researchers and hobby birders have started using convolutional neural networks to mine sound recordings to identify and track specific bird calls. Photography has always been
10976-627: 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
11088-416: The serious to trivial, notifying others of rarities, questioning the taxonomy or identification of a species, discussing field guides and other resources, asking for advice and guidance, or organizing groups to help save habitats. Occasional postings are mentioned in academic journals and therefore can be a valuable resource for professional and amateur birders alike. One of the oldest, Birdchat (based in
11200-487: The story of the construction of the reservoir to the public. Some funerary monuments from it can be seen at Edenham church, Lincolnshire. The reservoir is used not just for water storage, but is a popular sports centre – as well as water sports such as sailing , visitors enjoy fishing , walking and cycling along a 25 miles (40 km) perimeter track. A pleasure cruiser, the Rutland Belle , carries people around
11312-518: The term birder is unfamiliar to most lay people. At the most basic level, the distinction is perceived as one of dedication or intensity, though this is a subjective differentiation. Generally, self-described birders perceive themselves to be more versed in minutiae such as identification (aural and visual), molt, distribution, migration timing, and habitat usage. Whereas these dedicated birders may often travel specifically in search of birds, birdwatchers have been described by some enthusiasts as having
11424-493: 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
11536-517: The value of conservation are the subject of research. Many birders occupy themselves with observing local species (birding in their "local patch" ), but may also make specific trips to observe birds in other locales. The most active times of the year for birding in temperate zones are during the spring or fall migrations when the greatest variety of birds may be seen. On these occasions, large numbers of birds travel north or south to wintering or nesting locations. Early mornings are typically better as
11648-405: The visual characteristics of a bird, but also its patterns of movement and its sound, has wide applications for birders in the field. This class of product includes devices that can play (and in some cases record) a range of digital media, typically video, audio and still image files. Many modern digital cameras , mobile phones , and camcorders can be classified as portable media players . With
11760-412: 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
11872-473: The web; similarly, robotic cameras set up in largely inhospitable areas are being used to attempt the first photographs of the rare ivory-billed woodpecker . These systems represent new technologies in the birdwatcher's toolkit. In the early 1950s, the only way of communicating new bird sightings was through the postal system and it was generally too late for the recipients to act on the information. In 1953 James Ferguson-Lees began broadcasting rare bird news on
11984-499: The wetlands. Rutland Water Visitor Centre, located at Sykes Lane, is a charming visitor information centre where there are a range of visitor leaflets & maps, knowledgable staff, Rutland themed souvenirs & mini golf. The Lyndon Visitor Centre is located on the reserve's south shore. There are exhibits, bird viewing windows, trails and hides. Reservoir A reservoir ( / ˈ r ɛ z ər v w ɑːr / ; from French réservoir [ʁezɛʁvwaʁ] )
12096-476: 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
12208-420: Was aided by the availability of cars and their associated infrastructure. Nevertheless, distance to urban centres may still affect number of birdwatchers participating in observations of rare bird species. About 4% of North Americans were interested in birding in the 1970s, and in the mid-1980s at least 11% were found to watch birds at least 20 days of the year. The number of birders was estimated at 61 million in
12320-519: Was also used for the practice of fowling or hunting with firearms as in Shakespeare 's The Merry Wives of Windsor (1602): "She laments sir... her husband goes this morning a-birding." The terms birding and birdwatching are today used by some interchangeably, although some participants prefer birding , partly because it includes the auditory aspects of enjoying birds. In North America, many birders differentiate themselves from birdwatchers, and
12432-519: Was known as Empingham Reservoir . It flooded six or seven square kilometres of the Gwash valley as well as the side valley, at the head of which lies Oakham . Nether Hambleton and most of Middle Hambleton were demolished and their wells were plugged as part of the ground preparation. Their neighbouring village of Upper Hambleton survived, and now sits on the Hambleton Peninsula . The Gwash makes
12544-422: Was originally started as a club for "listers", but it now serves a much broader audience. Still, the ABA continues to publish an official annual report of North American list standings. Competitive birdwatching events include: Prominent national and continental organizations concerned with birding include the British Trust for Ornithology and Royal Society for the Protection of Birds in the United Kingdom, and
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