Sơn La is a province nestled in the northwestern part of Vietnam , renowned for its stunning landscapes and rich cultural heritage. The province is characterized by rolling hills, lush valleys , and terraced rice fields . The province is home to diverse ethnic communities , including the Thai , H'Mong , and Muong people.
122-528: Sơn La Dam , the largest hydroelectric power station in Southeast Asia . is located in this province. Sơn La is subdivided into 12 district-level sub-divisions and 204 commune-level sub-divisions: This article about a location in Sơn La Province , Vietnam is a stub . You can help Misplaced Pages by expanding it . Hydroelectric power station Hydroelectricity , or hydroelectric power ,
244-554: A NOAA gauging station above the falls. During winter, the Power Authority of New York works with Ontario Power Generation to prevent ice on the Niagara River from interfering with power production or causing flooding of shoreline property. One of their joint efforts is an 2,700-metre-long (8,800 ft) ice boom, which prevents the buildup of ice, yet allows water to continue flowing downstream. In addition to minimum water volume,
366-737: A greenhouse gas . According to the World Commission on Dams report, where the reservoir is large compared to the generating capacity (less than 100 watts per square metre of surface area) and no clearing of the forests in the area was undertaken prior to impoundment of the reservoir, greenhouse gas emissions from the reservoir may be higher than those of a conventional oil-fired thermal generation plant. In boreal reservoirs of Canada and Northern Europe, however, greenhouse gas emissions are typically only 2% to 8% of any kind of conventional fossil-fuel thermal generation. A new class of underwater logging operation that targets drowned forests can mitigate
488-676: A landslide . This drastically reduced power production and put tens of thousands of manufacturing jobs at stake. In 1957, Congress passed the Niagara Redevelopment Act, which granted the New York Power Authority the right to fully develop the United States' share of the Niagara River's hydroelectric potential. In 1961, when the Niagara Falls hydroelectric project went online, it was the largest hydropower facility in
610-463: A low-head hydro power plant with hydrostatic head of few meters to few tens of meters can be classified either as an SHP or an LHP. The other distinction between SHP and LHP is the degree of the water flow regulation: a typical SHP primarily uses the natural water discharge with very little regulation in comparison to an LHP. Therefore, the term SHP is frequently used as a synonym for the run-of-the-river power plant . The largest power producers in
732-560: A weir – the International Control Dam – with movable gates upstream from Horseshoe Falls. The water flow is halved at night and during the low tourist season winter months and only attains a minimum flow of 1,400 cubic metres per second (49,000 cu ft/s). Water diversion is regulated by the 1950 Niagara Treaty and is administered by the International Niagara Board of Control. The verdant green color of
854-569: A barrel with only minor injuries. Soucek was fined $ 500 for performing the stunt without a license. In 1985, he was fatally injured while attempting to re-create the Niagara drop at the Houston Astrodome . His aim was to climb into a barrel hoisted to the rafters of the Astrodome and to drop 55 m (180 ft) into a water tank on the floor. After his barrel released prematurely, it hit the side of
976-574: A brief account of the experience: "When I came into its awful presence the power of discription failed me, an irrisistible power closed my lips." Being on the Canadian border, Niagara Falls was on one of the routes of the Underground Railroad . The falls were also a popular tourist attraction for Southern slaveowners, who would bring their enslaved workers on the trip. "Many a time the trusted body-servant, or slave-girl, would leave master or mistress in
1098-426: A dam and reservoir is a flexible source, since the amount of electricity produced can be increased or decreased in seconds or minutes in response to varying electricity demand. Once a hydroelectric complex is constructed, it produces no direct waste, and almost always emits considerably less greenhouse gas than fossil fuel -powered energy plants. However, when constructed in lowland rainforest areas, where part of
1220-577: A descendant of Schoellkopf's firm, formed the Cataract Company headed by Edward Dean Adams, with the intent of expanding Niagara Falls' power capacity. In 1890, a five-member International Niagara Commission headed by Sir William Thomson among other distinguished scientists deliberated on the expansion of Niagara hydroelectric capacity based on seventeen proposals but could not select any as the best combined project for hydraulic development and distribution. In 1893, Westinghouse Electric (which had built
1342-413: A few shelters designed to protect the landscape while allowing large numbers of visitors to enjoy the falls. Commemorative statues, shops, restaurants, and a 1959 glass and metal observation tower were added later. Preservationists continue to strive to strike a balance between Olmsted's idyllic vision and the realities of administering a popular scenic attraction. Preservation efforts continued well into
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#17328908042171464-421: A flood and fail. Changes in the amount of river flow will correlate with the amount of energy produced by a dam. Lower river flows will reduce the amount of live storage in a reservoir therefore reducing the amount of water that can be used for hydroelectricity. The result of diminished river flow can be power shortages in areas that depend heavily on hydroelectric power. The risk of flow shortage may increase as
1586-469: A focus of pleasure and honeymoon visits. After World War II, the auto industry, along with local tourism boards, began to promote Niagara honeymoons. In about 1840, the English industrial chemist Hugh Lee Pattinson traveled to Canada, stopping at Niagara Falls long enough to make the earliest known photograph of the falls, a daguerreotype in the collection of Newcastle University . It was once believed that
1708-809: A large natural height difference between two waterways, such as a waterfall or mountain lake. A tunnel is constructed to take water from the high reservoir to the generating hall built in a cavern near the lowest point of the water tunnel and a horizontal tailrace taking water away to the lower outlet waterway. A simple formula for approximating electric power production at a hydroelectric station is: P = − η ( m ˙ g Δ h ) = − η ( ( ρ V ˙ ) g Δ h ) {\displaystyle P=-\eta \ ({\dot {m}}g\ \Delta h)=-\eta \ ((\rho {\dot {V}})\ g\ \Delta h)} where Efficiency
1830-451: A larger amount of methane than those in temperate areas. Like other non-fossil fuel sources, hydropower also has no emissions of sulfur dioxide, nitrogen oxides, or other particulates. Reservoirs created by hydroelectric schemes often provide facilities for water sports , and become tourist attractions themselves. In some countries, aquaculture in reservoirs is common. Multi-use dams installed for irrigation support agriculture with
1952-531: A location roughly approximately 60 metres (200 ft) south of the Railway Suspension Bridge. This one was of an entirely different design; it was a cantilever bridge to provide greater strength. The Niagara Cantilever Bridge had two cantilevers which were joined by steel sections; it opened officially in December 1883, and improvements were made over the years for a stronger structure. As rail traffic
2074-548: A long tradition of daredevils trying to go over the falls. Englishman Captain Matthew Webb , the first man to swim the English Channel , drowned in 1883 trying to swim the rapids downriver from the falls. On October 24, 1901, 63-year-old Michigan school teacher Annie Edson Taylor became the first person to go over the falls in a barrel as a publicity stunt; she survived, bleeding, but otherwise unharmed. Soon after exiting
2196-586: A positive risk adjusted return, unless appropriate risk management measures are put in place. While many hydroelectric projects supply public electricity networks, some are created to serve specific industrial enterprises. Dedicated hydroelectric projects are often built to provide the substantial amounts of electricity needed for aluminium electrolytic plants, for example. The Grand Coulee Dam switched to support Alcoa aluminium in Bellingham, Washington , United States for American World War II airplanes before it
2318-563: A potential source of power. The first known effort to harness the waters was in 1750, when Daniel Joncaire built a small canal above the falls to power his sawmill. Augustus and Peter Porter purchased this area and all of American Falls in 1805 from the New York state government, and enlarged the original canal to provide hydraulic power for their gristmill and tannery. In 1853, the Niagara Falls Hydraulic Power and Mining Company
2440-464: A proposal for international discussions on the establishment of a public park. Goat Island was one of the inspirations for the American side of the effort. William Dorsheimer , moved by the scene from the island, brought Olmsted to Buffalo in 1868 to design a city park system, which helped promote Olmsted's career. In 1879, the New York state legislature commissioned Olmsted and James T. Gardner to survey
2562-545: A relatively constant water supply. Large hydro dams can control floods, which would otherwise affect people living downstream of the project. Managing dams which are also used for other purposes, such as irrigation , is complicated. In 2021 the IEA called for "robust sustainability standards for all hydropower development with streamlined rules and regulations". Large reservoirs associated with traditional hydroelectric power stations result in submersion of extensive areas upstream of
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#17328908042172684-470: A result of climate change . One study from the Colorado River in the United States suggest that modest climate changes, such as an increase in temperature in 2 degree Celsius resulting in a 10% decline in precipitation, might reduce river run-off by up to 40%. Brazil in particular is vulnerable due to its heavy reliance on hydroelectricity, as increasing temperatures, lower water flow and alterations in
2806-494: A series of bridges. In 1955, the area between the rocks and Goat Island was filled in, creating Terrapin Point . In the early 1980s, the U.S. Army Corps of Engineers filled in more land and built diversion dams and retaining walls to force the water away from Terrapin Point. Altogether, 120 m (400 ft) of Horseshoe Falls were eliminated, including 30 m (100 ft) on the Canadian side. According to author Ginger Strand,
2928-448: A small TV/radio). Even smaller turbines of 200–300 W may power a few homes in a developing country with a drop of only 1 m (3 ft). A Pico-hydro setup is typically run-of-the-river , meaning that dams are not used, but rather pipes divert some of the flow, drop this down a gradient, and through the turbine before returning it to the stream. An underground power station is generally used at large facilities and makes use of
3050-455: A source of low-cost renewable energy. Alternatively, small hydro projects may be built in isolated areas that would be uneconomic to serve from a grid, or in areas where there is no national electrical distribution network. Since small hydro projects usually have minimal reservoirs and civil construction work, they are seen as having a relatively low environmental impact compared to large hydro. This decreased environmental impact depends strongly on
3172-414: A start-up time of the order of a few minutes. Although battery power is quicker its capacity is tiny compared to hydro. It takes less than 10 minutes to bring most hydro units from cold start-up to full load; this is quicker than nuclear and almost all fossil fuel power. Power generation can also be decreased quickly when there is a surplus power generation. Hence the limited capacity of hydropower units
3294-521: A state reservation at Niagara, and the Niagara Falls Association, a private citizens group founded in 1882, mounted a great letter-writing campaign and petition drive in support of the park. Professor Charles Eliot Norton and Olmsted were among the leaders of the public campaign, while New York Governor Alonzo Cornell opposed. Preservationists' efforts were rewarded on April 30, 1885, when Governor David B. Hill signed legislation creating
3416-478: A supplemental report detailing plans to restore the falls. Their intent was "to restore and conserve the natural surroundings of the Falls of Niagara, rather than to attempt to add anything thereto", and the report anticipated fundamental questions, such as how to provide access without destroying the beauty of the falls, and how to restore natural landscapes damaged by man. They planned a park with scenic roadways, paths and
3538-581: A total of 1,500 terawatt-hours (TWh) of electrical energy in one full cycle" which was "about 170 times more energy than the global fleet of pumped storage hydropower plants". Battery storage capacity is not expected to overtake pumped storage during the 2020s. When used as peak power to meet demand, hydroelectricity has a higher value than baseload power and a much higher value compared to intermittent energy sources such as wind and solar. Hydroelectric stations have long economic lives, with some plants still in service after 50–100 years. Operating labor cost
3660-448: A year's worth of rain fell within 24 hours (see 1975 Banqiao Dam failure ). The resulting flood resulted in the deaths of 26,000 people, and another 145,000 from epidemics. Millions were left homeless. The creation of a dam in a geologically inappropriate location may cause disasters such as 1963 disaster at Vajont Dam in Italy, where almost 2,000 people died. Niagara Falls This
3782-435: Is electricity generated from hydropower (water power). Hydropower supplies 15% of the world's electricity , almost 4,210 TWh in 2023, which is more than all other renewable sources combined and also more than nuclear power . Hydropower can provide large amounts of low-carbon electricity on demand, making it a key element for creating secure and clean electricity supply systems. A hydroelectric power station that has
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3904-448: Is hydroelectric power on a scale serving a small community or industrial plant. The definition of a small hydro project varies but a generating capacity of up to 10 megawatts (MW) is generally accepted as the upper limit. This may be stretched to 25 MW and 30 MW in Canada and the United States. Small hydro stations may be connected to conventional electrical distribution networks as
4026-462: Is about 790 m (2,590 ft) wide, while the American Falls is 320 m (1,050 ft) wide. The distance between the American extremity of Niagara Falls and the Canadian extremity is 1,039 m (3,409 ft). The peak flow over Horseshoe Falls was recorded at 6,370 m /s (225,000 cu ft/s). The average annual flow rate is 2,400 m /s (85,000 cu ft/s). Since
4148-627: Is also usually low, as plants are automated and have few personnel on site during normal operation. Where a dam serves multiple purposes, a hydroelectric station may be added with relatively low construction cost, providing a useful revenue stream to offset the costs of dam operation. It has been calculated that the sale of electricity from the Three Gorges Dam will cover the construction costs after 5 to 8 years of full generation. However, some data shows that in most countries large hydropower dams will be too costly and take too long to build to deliver
4270-469: Is an accepted version of this page Niagara Falls ( / n aɪ ˈ æ ɡ ər ə , - ɡ r ə / ny- AGG -ər-ə, -grə ) is a group of three waterfalls at the southern end of Niagara Gorge , spanning the border between the province of Ontario in Canada and the state of New York in the United States. The largest of the three is Horseshoe Falls , which straddles the international border of
4392-484: Is composed of hard, erosion-resistant limestone and dolomite of the Lockport Formation (Middle Silurian ). That hard layer of stone eroded more slowly than the underlying materials. Immediately below the caprock lies the weaker, softer, sloping Rochester Formation (Lower Silurian). This formation is composed mainly of shale , though it has some thin limestone layers. It also contains ancient fossils . In time,
4514-504: Is derived from the name given to a branch of the local native Neutral Confederacy , who are described as the Niagagarega people on several late-17th-century French maps of the area. According to George R. Stewart , it comes from the name of an Iroquois town called Onguiaahra , meaning "point of land cut in two". In 1847, an Iroquois interpreter stated that the name came from Jaonniaka-re , meaning "noisy point or portage". To Mohawks ,
4636-489: Is diverted via four huge tunnels that arise far upstream from the waterfalls. The water then passes through hydroelectric turbines that supply power to nearby areas of Canada and the United States before returning to the river well past the falls. When electrical demand is low, the Lewiston units can operate as pumps to transport water from the lower bay back up to the plant's reservoir , allowing this water to be used again during
4758-434: Is famed for its beauty and is a valuable source of hydroelectric power . Balancing recreational, commercial, and industrial uses has been a challenge for the stewards of the falls since the 19th century. Niagara Falls is 27 km (17 mi) northwest of Buffalo, New York , and 69 km (43 mi) southeast of Toronto , between the twin cities of Niagara Falls, Ontario , and Niagara Falls, New York . Niagara Falls
4880-466: Is highest in the winter when solar energy is at a minimum. Pico hydro is hydroelectric power generation of under 5 kW . It is useful in small, remote communities that require only a small amount of electricity. For example, the 1.1 kW Intermediate Technology Development Group Pico Hydro Project in Kenya supplies 57 homes with very small electric loads (e.g., a couple of lights and a phone charger, or
5002-445: Is initially produced during construction of the project, and some methane is given off annually by reservoirs, hydro has one of the lowest lifecycle greenhouse gas emissions for electricity generation. The low greenhouse gas impact of hydroelectricity is found especially in temperate climates . Greater greenhouse gas emission impacts are found in the tropical regions because the reservoirs of power stations in tropical regions produce
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5124-462: Is not an energy source, and appears as a negative number in listings. Run-of-the-river hydroelectric stations are those with small or no reservoir capacity, so that only the water coming from upstream is available for generation at that moment, and any oversupply must pass unused. A constant supply of water from a lake or existing reservoir upstream is a significant advantage in choosing sites for run-of-the-river. A tidal power station makes use of
5246-452: Is not generally used to produce base power except for vacating the flood pool or meeting downstream needs. Instead, it can serve as backup for non-hydro generators. The major advantage of conventional hydroelectric dams with reservoirs is their ability to store water at low cost for dispatch later as high value clean electricity. In 2021, the IEA estimated that the "reservoirs of all existing conventional hydropower plants combined can store
5368-499: Is now illegal, on both sides of the border, to attempt to go over the falls. Charles Stephens , a 58-year-old barber from Bristol, England, went over the falls in a wooden barrel in July 1920 and was the first person to die in an endeavor of this type. Bobby Leach went over Horseshoe Falls in a crude steel barrel in 1911 and needed rescuing by William "Red" Hill Sr. Hill again came to the rescue of Leach following his failed attempt to swim
5490-410: Is often higher (that is, closer to 1) with larger and more modern turbines. Annual electric energy production depends on the available water supply. In some installations, the water flow rate can vary by a factor of 10:1 over the course of a year. Hydropower is a flexible source of electricity since stations can be ramped up and down very quickly to adapt to changing energy demands. Hydro turbines have
5612-657: The Bonneville Dam in 1937 and being recognized by the Flood Control Act of 1936 as the premier federal flood control agency. Hydroelectric power stations continued to become larger throughout the 20th century. Hydropower was referred to as "white coal". Hoover Dam 's initial 1,345 MW power station was the world's largest hydroelectric power station in 1936; it was eclipsed by the 6,809 MW Grand Coulee Dam in 1942. The Itaipu Dam opened in 1984 in South America as
5734-533: The Industrial Revolution would drive development as well. In 1878, the world's first hydroelectric power scheme was developed at Cragside in Northumberland , England, by William Armstrong . It was used to power a single arc lamp in his art gallery. The old Schoelkopf Power Station No. 1 , US, near Niagara Falls , began to produce electricity in 1881. The first Edison hydroelectric power station,
5856-778: The International Exhibition of Hydropower and Tourism , with over one million visitors 1925. By 1920, when 40% of the power produced in the United States was hydroelectric, the Federal Power Act was enacted into law. The Act created the Federal Power Commission to regulate hydroelectric power stations on federal land and water. As the power stations became larger, their associated dams developed additional purposes, including flood control , irrigation and navigation . Federal funding became necessary for large-scale development, and federally owned corporations, such as
5978-474: The Niagara Gorge in 1920. In 1928, "Smiling Jean" Lussier tried an entirely different concept, going over the falls in a large rubber ball; he was successful and survived the ordeal. In the "Miracle at Niagara", on July 9, 1960, Roger Woodward, a seven-year-old American boy, was swept over Horseshoe Falls after the boat in which he was cruising lost power; two tourists pulled his 17-year-old sister Deanne from
6100-850: The North America Railway Hall of Fame in 2006. There was a lengthy dispute as to which agency should build the replacement for the Niagara Railway Arch, or Lower Steel Arch Bridge in the Upper Niagara area. When that was resolved, construction of a steel bridge commenced in February 1940. Named the Rainbow Bridge , and featuring two lanes for traffic separated by a barrier, it opened in November 1941 and remains in use today. The enormous energy of Niagara Falls has long been recognized as
6222-529: The St. Lawrence River , the combined falls have the highest flow rate of any waterfall in North America that has a vertical drop of more than 50 m (160 ft). During peak daytime tourist hours, more than 168,000 m (5.9 million cu ft) of water goes over the crest of the falls every minute. Horseshoe Falls is the most powerful waterfall in North America, as measured by flow rate. Niagara Falls
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#17328908042176344-605: The Tennessee Valley Authority (1933) and the Bonneville Power Administration (1937) were created. Additionally, the Bureau of Reclamation which had begun a series of western US irrigation projects in the early 20th century, was now constructing large hydroelectric projects such as the 1928 Hoover Dam . The United States Army Corps of Engineers was also involved in hydroelectric development, completing
6466-522: The Vanderbilts had fueled the construction of giant underground conduits leading to turbines generating upwards of 75 megawatts (100,000 hp ), sent as far as Buffalo, 32 km (20 mi) away. Some of the original designs for the power transmission plants were created by the Swiss firm Faesch & Piccard, which also constructed the original 3.7 MW (5,000 hp) waterwheels. Private companies on
6588-569: The Vulcan Street Plant , began operating September 30, 1882, in Appleton, Wisconsin , with an output of about 12.5 kilowatts. By 1886 there were 45 hydroelectric power stations in the United States and Canada; and by 1889 there were 200 in the United States alone. At the beginning of the 20th century, many small hydroelectric power stations were being constructed by commercial companies in mountains near metropolitan areas. Grenoble , France held
6710-506: The potential energy of dammed water driving a water turbine and generator . The power extracted from the water depends on the volume and on the difference in height between the source and the water's outflow. This height difference is called the head . A large pipe (the " penstock ") delivers water from the reservoir to the turbine. This method produces electricity to supply high peak demands by moving water between reservoirs at different elevations. At times of low electrical demand,
6832-400: The water frame , and continuous production played a significant part in the development of the factory system, with modern employment practices. In the 1840s, hydraulic power networks were developed to generate and transmit hydro power to end users. By the late 19th century, the electrical generator was developed and could now be coupled with hydraulics. The growing demand arising from
6954-591: The 20th century. J. Horace McFarland, the Sierra Club , and the Appalachian Mountain Club persuaded the United States Congress in 1906 to enact legislation to preserve the falls by regulating the waters of the Niagara River. The act sought, in cooperation with the Canadian government, to restrict diversion of water, and a treaty resulted in 1909 that limited the total amount of water diverted from
7076-413: The Canadian side also began to harness the energy of the falls. The Government of Ontario eventually brought power transmission operations under public control in 1906, distributing Niagara's energy to various parts of the Canadian province. Other hydropower plants were being built along the Niagara River. But in 1956, disaster struck when the region's largest hydropower station was partially destroyed in
7198-485: The Falls was the wreck of the schooner Michigan in 1827. Local hotel owners acquired a former Lake Erie freighter, loaded it with animals and effigies of people, towed it to a spot above the falls and let it plunge over the brink. Admission of fifty cents was charged. In October 1829, Sam Patch , who called himself "the Yankee Leapster", jumped from a high tower into the gorge below the falls and survived; this began
7320-494: The Horseshoe Falls is now entirely in Canada. Other sources say "most of" Horseshoe Falls is in Canada. The only recorded freeze-up of the river and falls was caused by an ice jam on March 29, 1848. No water (or at best a trickle) fell for as much as 40 hours. Waterwheels stopped, and mills and factories shut down for having no power. In 1912, American Falls was completely frozen, but the other two falls kept flowing. Although
7442-463: The IEA released a main-case forecast of 141 GW generated by hydropower over 2022–2027, which is slightly lower than deployment achieved from 2017–2022. Because environmental permitting and construction times are long, they estimate hydropower potential will remain limited, with only an additional 40 GW deemed possible in the accelerated case. In 2021 the IEA said that major modernisation refurbishments are required. Most hydroelectric power comes from
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#17328908042177564-418: The Niagara Falls was between present-day Queenston, Ontario , and Lewiston, New York , but erosion of the crest caused the falls to retreat approximately 10.9 kilometres (6.8 mi) southward. The shape of Horseshoe Falls has changed through the process of erosion, evolving from a small arch to a horseshoe bend to the present day V-shape. Just upstream from the falls' current location, Goat Island splits
7686-753: The Niagara Reservation, New York's first state park. New York State began to purchase land from developers, under the charter of the Niagara Reservation State Park . In the same year, the province of Ontario established the Queen Victoria Niagara Falls Park for the same purpose. On the Canadian side, the Niagara Parks Commission governs land usage along the entire course of the Niagara River, from Lake Erie to Lake Ontario. In 1887, Olmsted and Calvert Vaux issued
7808-450: The Western world. Today, Niagara is still the largest electricity producer in New York state, with a generating capacity of 2.4 GW. Up to 1,420 cubic metres per second (50,000 cu ft/s) of water is diverted from the Niagara River through conduits under the city of Niagara Falls to the Lewiston and Robert Moses power plants. Currently between 50% and 75% of the Niagara River's flow
7930-566: The Wisconsin glaciation about 10,000 years ago. The retreat of the ice sheet left behind a large amount of meltwater (see Lake Algonquin , Lake Chicago , Glacial Lake Iroquois , and Champlain Sea ) that filled up the basins that the glaciers had carved, thus creating the Great Lakes as we know them today. Scientists posit there is an old valley, St David's Buried Gorge , buried by glacial drift , at
8052-464: The ability to transport particles heavier than itself downstream. This has a negative effect on dams and subsequently their power stations, particularly those on rivers or within catchment areas with high siltation. Siltation can fill a reservoir and reduce its capacity to control floods along with causing additional horizontal pressure on the upstream portion of the dam. Eventually, some reservoirs can become full of sediment and useless or over-top during
8174-464: The approximate location of the present Welland Canal . When the ice melted, the upper Great Lakes emptied into the Niagara River, which followed the rearranged topography across the Niagara Escarpment . In time, the river cut a gorge through the north-facing cliff, or cuesta . Because of the interactions of three major rock formations, the rocky bed did not erode evenly. The caprock formation
8296-595: The balance between stream flow and power production. Micro hydro means hydroelectric power installations that typically produce up to 100 kW of power. These installations can provide power to an isolated home or small community, or are sometimes connected to electric power networks. There are many of these installations around the world, particularly in developing nations as they can provide an economical source of energy without purchase of fuel. Micro hydro systems complement photovoltaic solar energy systems because in many areas water flow, and thus available hydro power,
8418-499: The barrel, she said, "No one ought ever do that again." Days before Taylor's attempt, her domestic cat was sent over the falls in her barrel to test its strength. The cat survived the plunge unharmed and later posed with Taylor in photographs. Since Taylor's historic ride, over a dozen people have intentionally gone over the falls in or on a device, despite her advice. Some have survived unharmed, but others have drowned or been severely injured. Survivors face charges and stiff fines, as it
8540-411: The course of the Niagara River, resulting in the separation of Horseshoe Falls to the west from the American and Bridal Veil Falls to the east. Engineering has slowed erosion and recession. The current rate of erosion is approximately 30 centimeters (0.98 feet) per year, down from a historical average of 0.9 m (3.0 ft) per year. At this rate, in about 50,000 years Niagara Falls will have eroded
8662-532: The crest of Horseshoe falls was reduced to maintain an uninterrupted "curtain of water". In August 2005, Ontario Power Generation , which is responsible for the Sir Adam Beck stations , started a major civil engineering project, called the Niagara Tunnel Project , to increase power production by building a new 12.7-metre (42 ft) diameter, 10.2-kilometre-long (6.3 mi) water diversion tunnel. It
8784-404: The daily rise and fall of ocean water due to tides; such sources are highly predictable, and if conditions permit construction of reservoirs, can also be dispatchable to generate power during high demand periods. Less common types of hydro schemes use water's kinetic energy or undammed sources such as undershot water wheels . Tidal power is viable in a relatively small number of locations around
8906-505: The dams, sometimes destroying biologically rich and productive lowland and riverine valley forests, marshland and grasslands. Damming interrupts the flow of rivers and can harm local ecosystems, and building large dams and reservoirs often involves displacing people and wildlife. The loss of land is often exacerbated by habitat fragmentation of surrounding areas caused by the reservoir. Hydroelectric projects can be disruptive to surrounding aquatic ecosystems both upstream and downstream of
9028-482: The daytime when electricity use peaks. During peak electrical demand, the same Lewiston pumps are reversed and become generators. To preserve Niagara Falls' natural beauty, a 1950 treaty signed by the U.S. and Canada limited water usage by the power plants. The treaty allows higher summertime diversion at night when tourists are fewer and during the winter months when there are even fewer tourists. This treaty, designed to ensure an "unbroken curtain of water" flowing over
9150-732: The discharge of some errand, and never come back." This sometimes led to conflict. Early town father Peter Porter assisted slavecatchers in finding runaway slaves, even leading, in the case of runaway Solomon Moseby, to a riot in Niagara-on-the-Lake, Canada. Much of this history is memorialized in the Niagara Falls Underground Railroad Heritage Center . After the American Civil War , the New York Central Railroad publicized Niagara Falls as
9272-690: The effect of forest decay. Another disadvantage of hydroelectric dams is the need to relocate the people living where the reservoirs are planned. In 2000, the World Commission on Dams estimated that dams had physically displaced 40–80 million people worldwide. Because large conventional dammed-hydro facilities hold back large volumes of water, a failure due to poor construction, natural disasters or sabotage can be catastrophic to downriver settlements and infrastructure. During Typhoon Nina in 1975 Banqiao Dam in Southern China failed when more than
9394-399: The excess generation capacity is used to pump water into the higher reservoir, thus providing demand side response . When the demand becomes greater, water is released back into the lower reservoir through a turbine. In 2021 pumped-storage schemes provided almost 85% of the world's 190 GW of grid energy storage and improve the daily capacity factor of the generation system. Pumped storage
9516-506: The falls and to create the single most important document in the Niagara preservation movement, a "Special Report on the preservation of Niagara Falls". The report advocated for state purchase, restoration and preservation through public ownership of the scenic lands surrounding Niagara Falls. Restoring the former beauty of the falls was described in the report as a "sacred obligation to mankind". In 1883, New York Governor Grover Cleveland drafted legislation authorizing acquisition of lands for
9638-505: The falls by both nations to approximately 1,600 cubic metres per second (56,000 cu ft/s). That limitation remained in effect until 1950. Erosion control efforts have always been of importance. Underwater weirs redirect the most damaging currents, and the top of the falls has been strengthened. In June 1969, a temporary rock and earth dam was constructed, completely diverting the Niagara River from American Falls for several months. During this time, two bodies were removed from under
9760-522: The falls commonly ice up most winters, the river and the falls do not freeze completely. The years 1885, 1902, 1906, 1911, 1932, 1936, 2014, 2017 and 2019 are noted for partial freezing of the falls. A so-called ice bridge was common in certain years at the base of the falls and was used by people who wanted to cross the river before bridges had been built. During some winters, the ice sheet was as thick as 12 to 30 metres (40 to 100 ft), but that thickness has not occurred since 1954. The ice bridge of 1841
9882-470: The falls is credited to Belgian missionary, Father Louis Hennepin in 1677, after traveling with the explorer René-Robert Cavelier, Sieur de La Salle , thus bringing the falls to the attention of Europeans. French Jesuit missionary Paul Ragueneau likely visited the falls some 35 years before Hennepin's visit while working among the Huron First Nation in Canada. Jean de Brébeuf also may have visited
10004-476: The falls much easier. The story of Niagara Falls in the 20th century is largely that of efforts to harness the energy of the falls for hydroelectric power , and to control the development on both sides that threaten the area's natural beauty. Before the late 20th century, the northeastern end of Horseshoe Falls was in the United States, flowing around the Terrapin Rocks, which were once connected to Goat Island by
10126-471: The falls while passing through New York en route to Cumberland House as part of his second Arctic expedition, calling them "so justly celebrated as the first in the world for grandeur". In 1843, Frederick Douglass joined the American Anti-Slavery Society 's "One Hundred Conventions" tour throughout New York and the midwest. Sometime on this tour, Douglass visited Niagara Falls and wrote
10248-614: The falls) was a two-level suspension structure that opened in January 1869; it was destroyed during a severe storm in January 1889. The replacement was built quickly and opened in May 1889. In order to handle heavy traffic, a second bridge was commissioned, slightly closer to American Falls. This one was a steel bridge and opened to traffic in June 1897; it was known as the Upper Steel Arch Bridge but
10370-555: The falls, affords the closest view of the falls and is open to non-commercial vehicle traffic and pedestrians. The Whirlpool Rapids Bridge lies 1.6 kilometres (1 mi) north of the Rainbow Bridge and is the oldest bridge over the Niagara River. Nearby Niagara Falls International Airport and Buffalo Niagara International Airport were named after the waterfall, as were Niagara University , countless local businesses, and even an asteroid . The first recorded publicity stunt using
10492-405: The falls, including a man who had been seen jumping over the falls, and the body of a woman, which was discovered once the falls dried. While Horseshoe Falls absorbed the extra flow, the U.S. Army Corps of Engineers studied the riverbed and mechanically bolted and strengthened any faults they found; faults that would, if left untreated, have hastened the retreat of American Falls. A plan to remove
10614-424: The falls, states that during daylight time during the tourist season (April 1 to October 31) there must be 2,800 cubic metres per second (100,000 cu ft/s) of water flowing over the falls, and during the night and off-tourist season there must be 1,400 cubic metres per second (50,000 cu ft/s) of water flowing over the falls. This treaty is monitored by the International Niagara Board of Control, using
10736-580: The falls, while spending time with the Neutral Nation . The Finland-Swedish naturalist Pehr Kalm explored the area in the early 18th century and is credited with the first scientific description of the falls. In 1762, Captain Thomas Davies , a British Army officer and artist, surveyed the area and painted the watercolor, An East View of the Great Cataract of Niagara , the first eyewitness painting of
10858-419: The falls. During the 19th century, tourism became popular, and by the mid-century, it was the area's main industry. Theodosia Burr Alston (daughter of Vice President Aaron Burr ) and her husband Joseph Alston were the first recorded couple to honeymoon there in 1801. Napoleon Bonaparte 's brother Jérôme visited with his bride in the early 19th century. In 1825, British explorer John Franklin visited
10980-463: The flow is a direct function of the Lake Erie water elevation, it typically peaks in late spring or early summer. During the summer months, at least 2,800 m /s (99,000 cu ft/s) of water traverse the falls, some 90% of which goes over Horseshoe Falls, while the balance is diverted to hydroelectric facilities and then on to American Falls and Bridal Veil Falls. This is accomplished by employing
11102-534: The forest is inundated, substantial amounts of greenhouse gases may be emitted. Construction of a hydroelectric complex can have significant environmental impact, principally in loss of arable land and population displacement. They also disrupt the natural ecology of the river involved, affecting habitats and ecosystems, and siltation and erosion patterns. While dams can ameliorate the risks of flooding, dam failure can be catastrophic. In 2021, global installed hydropower electrical capacity reached almost 1,400 GW,
11224-658: The gorge. It opened for use by the public in July 1848 and remained in use until 1855. A second bridge in the Upper Falls area was commissioned, with two levels or decks, one for use by the Great Western Railway . This Niagara Falls Suspension Bridge opened in 1855. It was used by conductors on the Underground Railroad to escort runaway slaves to Canada. In 1882, the Grand Trunk Railway took over control of
11346-506: The highest among all renewable energy technologies. Hydroelectricity plays a leading role in countries like Brazil, Norway and China. but there are geographical limits and environmental issues. Tidal power can be used in coastal regions. China added 24 GW in 2022, accounting for nearly three-quarters of global hydropower capacity additions. Europe added 2 GW, the largest amount for the region since 1990. Meanwhile, globally, hydropower generation increased by 70 TWh (up 2%) in 2022 and remains
11468-453: The huge mound of talus deposited in 1954 was abandoned owing to cost, and in November 1969, the temporary dam was dynamited , restoring flow to American Falls. Even after these undertakings, Luna Island , the small piece of land between the American Falls and Bridal Veil Falls, remained off limits to the public for years owing to fears that it was unstable and could collapse into the gorge. Commercial interests have continued to encroach on
11590-516: The land surrounding the state park, including the construction of several tall buildings (most of them hotels) on the Canadian side. The result is a significant alteration and urbanisation of the landscape. One study found that the tall buildings changed the breeze patterns and increased the number of mist days from 29 per year to 68 per year, but another study disputed this idea. In 2013, New York State began an effort to renovate Three Sisters Islands located south of Goat Island. Funds were used from
11712-519: The largest renewable energy source, surpassing all other technologies combined. Hydropower has been used since ancient times to grind flour and perform other tasks. In the late 18th century hydraulic power provided the energy source needed for the start of the Industrial Revolution . In the mid-1700s, French engineer Bernard Forest de Bélidor published Architecture Hydraulique , which described vertical- and horizontal-axis hydraulic machines, and in 1771 Richard Arkwright 's combination of water power ,
11834-731: The largest, producing 14 GW , but was surpassed in 2008 by the Three Gorges Dam in China at 22.5 GW . Hydroelectricity would eventually supply some countries, including Norway , Democratic Republic of the Congo , Paraguay and Brazil , with over 85% of their electricity. In 2021 the International Energy Agency (IEA) said that more efforts are needed to help limit climate change . Some countries have highly developed their hydropower potential and have very little room for growth: Switzerland produces 88% of its potential and Mexico 80%. In 2022,
11956-475: The name refers to "the neck", pronounced "onyara"; the portage or neck of land between lakes Erie and Ontario onyara . Many figures have been suggested as first circulating a European eyewitness description of Niagara Falls. The Frenchman Samuel de Champlain visited the area as early as 1604 during his exploration of what is now Canada, and members of his party reported to him the spectacular waterfalls, which he described in his journals. The first description of
12078-633: The plant site. Generation of hydroelectric power changes the downstream river environment. Water exiting a turbine usually contains very little suspended sediment, which can lead to scouring of river beds and loss of riverbanks. The turbines also will kill large portions of the fauna passing through, for instance 70% of the eel passing a turbine will perish immediately. Since turbine gates are often opened intermittently, rapid or even daily fluctuations in river flow are observed. Drought and seasonal changes in rainfall can severely limit hydropower. Water may also be lost by evaporation. When water flows it has
12200-450: The rainfall regime, could reduce total energy production by 7% annually by the end of the century. Lower positive impacts are found in the tropical regions. In lowland rainforest areas, where inundation of a part of the forest is necessary, it has been noted that the reservoirs of power plants produce substantial amounts of methane . This is due to plant material in flooded areas decaying in an anaerobic environment and forming methane,
12322-664: The re-licensing of the New York Power Authority hydroelectric plant downriver in Lewiston, New York, to rebuild walking paths on the Three Sisters Islands and to plant native vegetation on the islands. The state also renovated the area around Prospect Point at the brink of American Falls in the state park. Theories differ as to the origin of the name of the falls. The Native American word Ongiara means thundering water ; The New York Times used this in 1925. According to Iroquoian scholar Bruce Trigger , Niagara
12444-691: The remaining 32 km (20 mi) to Lake Erie, and the falls will cease to exist. In the 1870s, sightseers had limited access to Niagara Falls and often had to pay for a glimpse, and industrialization threatened to carve up Goat Island to further expand commercial development. Other industrial encroachments and lack of public access led to a conservation movement in the U.S. known as Free Niagara, led by such notables as Hudson River School artist Frederic Edwin Church , landscape designer Frederick Law Olmsted , and architect Henry Hobson Richardson . Church approached Lord Dufferin , governor-general of Canada, with
12566-587: The river eroded the soft layer that supported the hard layers, undercutting the hard caprock, which gave way in great chunks. This process repeated countless times, eventually carving out the falls. Submerged in the river in the lower valley, hidden from view, is the Queenston Formation (Upper Ordovician ), which is composed of shales and fine sandstones . All three formations were laid down in an ancient sea, their differences of character deriving from changing conditions within that sea. About 10,900 years ago,
12688-569: The river only 6 m (20 ft) from the lip of the Horseshoe Falls at Goat Island. Minutes later, Woodward was plucked from the roiling plunge pool beneath Horseshoe Falls after grabbing a life ring thrown to him by the crew of the Maid of the Mist boat. The children's uncle, Jim Honeycutt, who had been steering the boat, was swept over the edge to his death. On July 2, 1984, Canadian Karel Soucek from Hamilton, Ontario , plunged over Horseshoe Falls in
12810-490: The rocks above the falls. The two men on the scow were rescued, but the vessel remained trapped on rocks in the river, and is still visible there in a deteriorated state, although its position shifted by 50 meters (160 ft) during a storm on October 31, 2019. Daredevil William "Red" Hill Sr. was particularly praised for his role in the rescue. After the First World War , tourism boomed as automobiles made getting to
12932-548: The second deck after it absorbed the Great Western company. Significant structural improvements were made in the late 1870s and then in 1886; this bridge remained in use until 1897. Because of the volume of traffic, the decision was made to construct a new arch bridge nearby, under and around the existing bridge. After it opened in September 1897, a decision was made to remove and scrap the railway suspension bridge. This new bridge
13054-700: The small figure standing silhouetted with a top hat was added by an engraver working from imagination as well as the daguerreotype as his source, but the figure is clearly present in the photograph. Because of the very long exposure required, of ten minutes or more, the figure is assumed by Canada's Niagara Parks agency to be Pattinson. The image is left-right inverted and taken from the Canadian side . Pattinson made other photographs of Horseshoe Falls; these were then transferred to engravings to illustrate Noël Marie Paymal Lerebours ' Excursions Daguerriennes (Paris, 1841–1864). On August 6, 1918, an iron scow became stuck on
13176-455: The smaller-scale Ames Hydroelectric Generating Plant near Ophir, Colorado , two years earlier) was hired to design a system to generate alternating current on Niagara Falls, and three years after that a large-scale AC power system was created (activated on August 26, 1895). The Adams Power Plant Transformer House remains as a landmark of the original system. By 1896, financing from moguls including J. P. Morgan , John Jacob Astor IV , and
13298-422: The tank, and he died the next day from his injuries. In August 1985, Steve Trotter , an aspiring stuntman from Rhode Island , became the youngest person ever (age 22) and the first American in 25 years to go over the falls in a barrel. Ten years later, Trotter went over the falls again, becoming the second person to go over the falls twice and survive. It was also the second "duo"; Lori Martin joined Trotter for
13420-591: The two countries. It is also known as the Canadian Falls. The smaller American Falls and Bridal Veil Falls lie within the United States. Bridal Veil Falls is separated from Horseshoe Falls by Goat Island and from American Falls by Luna Island , with both islands situated in New York. Formed by the Niagara River , which drains Lake Erie into Lake Ontario before flowing out to the Atlantic Ocean through
13542-459: The water flowing over Niagara Falls is a byproduct of the estimated 60 tonnes/minute of dissolved salts and rock flour (very finely ground rock) generated by the erosive force of the Niagara River. The Niagara River is an important bird area due to its impact on Bonaparte's gulls , ring-billed gulls , and herring gulls . Several thousand birds migrate and winter in the surrounding area. The features that became Niagara Falls were created by
13664-524: The world are hydroelectric power stations, with some hydroelectric facilities capable of generating more than double the installed capacities of the current largest nuclear power stations . Although no official definition exists for the capacity range of large hydroelectric power stations, facilities from over a few hundred megawatts are generally considered large hydroelectric facilities. Currently, only seven facilities over 10 GW ( 10,000 MW ) are in operation worldwide, see table below. Small hydro
13786-539: The world. The classification of hydropower plants starts with two top-level categories: The classification of a plant as an SHP or LHP is primarily based on its nameplate capacity , the threshold varies by the country, but in any case a plant with the capacity of 50 MW or more is considered an LHP. As an example, for China, SHP power is below 25 MW, for India - below 15 MW, most of Europe - below 10 MW. The SHP and LHP categories are further subdivided into many subcategories that are not mutually exclusive. For example,
13908-573: Was allowed to provide irrigation and power to citizens (in addition to aluminium power) after the war. In Suriname , the Brokopondo Reservoir was constructed to provide electricity for the Alcoa aluminium industry. New Zealand 's Manapouri Power Station was constructed to supply electricity to the aluminium smelter at Tiwai Point . Since hydroelectric dams do not use fuel, power generation does not produce carbon dioxide . While carbon dioxide
14030-426: Was chartered, which eventually constructed the canals that would be used to generate electricity. In 1881, under the leadership of Jacob F. Schoellkopf , the Niagara River's first hydroelectric generating station was built. The water fell 26 metres (86 ft) and generated direct current electricity, which ran the machinery of local mills and lit up some of the village streets. The Niagara Falls Power Company,
14152-570: Was formed when glaciers receded at the end of the Wisconsin glaciation (the last ice age ), and water from the newly formed Great Lakes carved a path over and through the Niagara Escarpment en route to the Atlantic Ocean. Horseshoe Falls is about 57 m (187 ft) high, while the height of the American Falls varies between 21 and 30 m (69 and 98 ft) because of the presence of giant boulders at its base. The larger Horseshoe Falls
14274-609: Was improved and incorporated into the Saint Lawrence Seaway in the mid-1950s. While the seaway diverted water traffic from nearby Buffalo and led to the demise of its steel and grain mills, other industries in the Niagara River valley flourished with the help of the electric power produced by the river. However, since the 1970s the region has declined economically. The cities of Niagara Falls, Ontario, Canada, and Niagara Falls, New York, United States, are connected by two international bridges. The Rainbow Bridge, just downriver from
14396-592: Was increasing, the Michigan Central Railroad company decided to build a new bridge in 1923, to be located between the Lower Steel Arch Bridge and the Cantilever Bridge. The Michigan Central Railway Bridge opened in February 1925 and remained in use until the early 21st century. The Cantilever Bridge was removed and scrapped after the new rail bridge opened. Nonetheless, it was inducted into
14518-490: Was initially known as the Niagara Railway Arch, or Lower Steel Arch Bridge; it had two decks, the lower one used for carriages and the upper for trains. In 1937, it was renamed the Whirlpool Rapids Bridge and remains in use today. All of the structures built up to that time were referred to as Lower Niagara bridges and were some distance from the falls. The first bridge in the so-called Upper Niagara area (closer to
14640-504: Was officially placed into service in March 2013, helping to increase the generating complex's nameplate capacity by 150 megawatts. It did so by tapping water from farther up the Niagara River than was possible with the preexisting arrangement. The tunnel provided new hydroelectricity for approximately 160,000 homes. Ships can bypass Niagara Falls by means of the Welland Canal , which
14762-484: Was often called the Honeymoon Bridge . The single level included a track for trolleys and space for carriages and pedestrians. The design led to the bridge being very close to the surface of the river and in January 1938, an ice jam twisted the steel frame of the bridge which later collapsed on January 27, 1938. Another Lower Niagara bridge had been commissioned in 1883 by Cornelius Vanderbilt for use by railways at
14884-478: Was said to be at least 30 metres (100 ft) thick. On February 4, 1912, the ice bridge which had formed on January 15 began breaking up while people were still on it. Many escaped, but three died during the event, later named the Ice Bridge Tragedy. A number of bridges have spanned the Niagara River in the general vicinity of the falls. The first, not far from the whirlpool , was a suspension bridge above
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