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165-526: The earliest proposals for exploitation of hydropower on the Potomac were made in the 1880s. By the 1920s the U.S. Army Corps of Engineers reviewed the possibilities for hydroelectric power. After a new study mandated by Congress in 1936-37, the Corps of Engineers in 1938 proposed a dam for flood control, power generation and water quality improvement, to be located above Great Falls at Riverbend. The scheme

330-531: A containment policy to stop Soviet expansion. In June 1943, a visiting politician had suggested to Eisenhower that he might become president after the war. Believing that a general should not participate in politics, Merlo J. Pusey wrote that "figuratively speaking, [Eisenhower] kicked his political-minded visitor out of his office". As others asked him about his political future, Eisenhower told one that he could not imagine wanting to be considered for any political job "from dogcatcher to Grand High Supreme King of

495-510: A parkway on the canal right-of-way from Cumberland to Washington. Opposition to this plan gained force during the 1950s and culminated in a 1954 letter to the Washington Post by U.S. Supreme Court Justice William O. Douglas blasting the plan and urging the canal's preservation as a wild park, and challenging Post editors to walk the 185-mile (298 km) length of the canal towpath. Joined by conservation leaders and supported by

660-608: A very bloody large-scale battle , and the Germans finally surrendered on May 7, 1945. Throughout 1945, the allied armies liberated numerous Nazi concentration camps throughout Europe. As the allies learned the full extend of the Holocaust , Eisenhower anticipated that, in the future, attempts to recharacterize Nazi crimes as propaganda ( Holocaust denial ) would be made, and took steps against it by demanding extensive photo and film documentation of Nazi death camps . Following

825-492: A 24,000-acre (9,700 ha) reservoir with a reservoir at 215 feet above sea level. Power generation capacity was planned at 105 MW and total cost was projected at $ 18,616,000 in 1921. By direction of Congress in 1936 and 1937 the Army Corps of Engineers, which manages Washington D.C.'s water supply system, examined possibilities for flood control along the Potomac. The Corps returned with an ambitious agenda for 14 dams on

990-493: A Southern Europe hydropower race. In Italy's Po Valley , the main 20th century transition was not the creation of hydropower but the transition from mechanical to electrical hydropower. 12,000 watermills churned in the Po watershed in the 1890s, but the first commercial hydroelectric plant, completed in 1898, signaled the end of the mechanical reign. These new large plants moved power away from rural mountainous areas to urban centers in

1155-657: A basic golf facility installed at Camp David, and he became close friends with the Augusta National Chairman Clifford Roberts , inviting Roberts to stay at the White House on numerous occasions. Roberts, an investment broker, also handled the Eisenhower family's investments. He began oil painting while at Columbia University, after watching Thomas E. Stephens paint Mamie's portrait. Eisenhower painted about 260 oils during

1320-443: A billion tonnes of CO2 greenhouse gas a year. This occurs when organic matters accumulate at the bottom of the reservoir because of the deoxygenation of water which triggers anaerobic digestion . People who live near a hydro plant site are displaced during construction or when reservoir banks become unstable. Another potential disadvantage is cultural or religious sites may block construction. A watermill or water mill

1485-854: A broken-down Tin Lizzie , loaded with paint, has been driven over it". Angels in the Outfield was Eisenhower's favorite movie. His favorite reading material for relaxation was the Western novels of Zane Grey . With his excellent memory and ability to focus, Eisenhower was skilled at cards. He learned poker, which he called his "favorite indoor sport", in Abilene. Eisenhower recorded West Point classmates' poker losses for payment after graduation and later stopped playing because his opponents resented having to pay him. A friend reported that after learning to play contract bridge at West Point, Eisenhower played

1650-464: A camp for thousands of troops and developing a full combat training schedule. After the war, Eisenhower reverted to his regular rank of captain and a few days later was promoted to major , a rank he held for 16 years. The major was assigned in 1919 to a transcontinental Army convoy to test vehicles and dramatize the need for improved roads. Indeed, the convoy averaged only 5 miles per hour (8.0 km/h) from Washington, D.C. to San Francisco; later

1815-412: A desire to secure a reliable water supply for Washington, D.C. increased the attractiveness of a major dam on the Potomac. A detailed plan for a major dam on the Potomac at Great Falls was first advanced by the Corps of Engineers in a 1921 report, which proposed a concrete gravity dam which would include a hydroelectric powerplant. Reservoir capacity was projected at 300,000 acre-feet (0.37 km) for

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1980-433: A device to serve wine, and five devices to lift water from rivers or pools, where three of them are animal-powered and one can be powered by animal or water. Moreover, they included an endless belt with jugs attached, a cow-powered shadoof (a crane-like irrigation tool), and a reciprocating device with hinged valves. In the 19th century, French engineer Benoît Fourneyron developed the first hydropower turbine. This device

2145-670: A life-threatening stomach ailment but recovered fully. Eisenhower was promoted to the rank of permanent lieutenant colonel in 1936. He also learned to fly with the Philippine Army Air Corps at the Zablan Airfield in Camp Murphy under Capt. Jesus Villamor , making a solo flight over the Philippines in 1937, and obtained his private pilot's license in 1939 at Fort Lewis . Also around this time, he

2310-611: A lower dam at Blockhouse Point, near the mouth of Little Seneca Creek , to be called Seneca Dam. This proposal was debated through the 1960s until it was finally abandoned in 1969. Beginning in the 1880s a series of proposals were made to use the Potomac River 's hydropower potential, which arises from the steep drop of the river at Great Falls as it crosses the Atlantic Seaboard fall line , dropping to sea level over about 10 miles (16 km). Frequent flooding and

2475-484: A man's character by the way he plays cards. Eisenhower is a calm and collected player and never whines at his losses. He is brilliant in victory but never commits the bridge player's worst crime of gloating when he wins." Bridge expert Oswald Jacoby frequently participated in the White House games and said, "The President plays better bridge than golf. He tries to break 90 at golf. At bridge, you would say he plays in

2640-464: A microturbine in a cylindrical housing. Electricity generated by that turbine is used to charge 12-volt batteries." The term rain power has also been applied to hydropower systems which include the process of capturing the rain. Evidence suggests that the fundamentals of hydropower date to ancient Greek civilization . Other evidence indicates that the waterwheel independently emerged in China around

2805-473: A military mistake for him to attack Berlin and said orders to that effect would have to be explicit. The British backed down but then wanted Eisenhower to move into Czechoslovakia for political reasons. Washington refused to support Churchill's plan to use Eisenhower's army for political maneuvers against Moscow . The actual division of Germany followed the lines that Roosevelt, Churchill and Stalin had previously agreed upon. The Soviet Red Army captured Berlin in

2970-490: A mutual need for hydropower could lead to cooperation between otherwise adversarial nations. Hydropower technology and attitude began to shift in the second half of the 20th century. While countries had largely abandoned their small hydropower systems by the 1930s, the smaller hydropower plants began to make a comeback in the 1970s, boosted by government subsidies and a push for more independent energy producers. Some politicians who once advocated for large hydropower projects in

3135-563: A pessimistic assessment, stating he had an "uneasy feeling" about Chaney and his staff. On June 23, 1942, he returned to London as Commanding General, European Theater of Operations (ETOUSA), based in London and with a house in Coombe, Kingston upon Thames , and took over command of ETOUSA from Chaney. He was promoted to lieutenant general on July 7. In November 1942, Eisenhower was also appointed Supreme Commander Allied Expeditionary Force of

3300-474: A railroad mechanic and then at a creamery. By 1898, the parents made a decent living and provided a suitable home for their large family. Eisenhower was born David Dwight Eisenhower in Denison, Texas, on October 14, 1890, the third of seven sons born to Ida and David. His mother soon reversed his two forenames after his birth to avoid the confusion of having two Davids in the family. He was named Dwight after

3465-501: A relatively consistent source of power. Nonetheless, it has economic, sociological, and environmental downsides and requires a sufficiently energetic source of water, such as a river or elevated lake . International institutions such as the World Bank view hydropower as a low-carbon means for economic development . Since ancient times, hydropower from watermills has been used as a renewable energy source for irrigation and

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3630-535: A remote sensor." Villazon suggested a better application would be to collect the water from fallen rain and use it to drive a turbine, with an estimated energy generation of 3 kWh of energy per year for a 185 m roof. A microturbine-based system created by three students from the Technological University of Mexico has been used to generate electricity. The Pluvia system "uses the stream of rainwater runoff from houses' rooftop rain gutters to spin

3795-446: A stream can vary widely from season to season. The development of a hydropower site requires analysis of flow records , sometimes spanning decades, to assess the reliable annual energy supply. Dams and reservoirs provide a more dependable source of power by smoothing seasonal changes in water flow. However, reservoirs have a significant environmental impact , as does alteration of naturally occurring streamflow. Dam design must account for

3960-684: A tool to interfere in the economic development of African countries, such as the World Bank with the Kariba and Akosombo Dams , and the Soviet Union with the Aswan Dam . The Nile River especially has borne the consequences of countries both along the Nile and distant foreign actors using the river to expand their economic power or national force. After the British occupation of Egypt in 1882,

4125-485: A turbine with 90% efficiency. He applied scientific principles and testing methods to the problem of turbine design. His mathematical and graphical calculation methods allowed the confident design of high-efficiency turbines to exactly match a site's specific flow conditions. The Francis reaction turbine is still in use. In the 1870s, deriving from uses in the California mining industry, Lester Allan Pelton developed

4290-587: A unit that trained tank crews. Between the wars he served in staff positions in the US and the Philippines, reaching the rank of brigadier general shortly before the entry of the US into World War II in 1941. After further promotion Eisenhower oversaw the Allied invasions of North Africa and Sicily before supervising the invasions of France and Germany . After the war ended in Europe, he served as military governor of

4455-408: A voracious reader on the subject. Other favorite subjects early in his education were arithmetic and spelling. Eisenhower's parents set aside specific times at breakfast and at dinner for daily family Bible reading. Chores were regularly assigned and rotated among all the children, and misbehavior was met with unequivocal discipline, usually from David. His mother, previously a member (with David) of

4620-535: Is a mill that uses hydropower. It is a structure that uses a water wheel or water turbine to drive a mechanical process such as milling (grinding) , rolling , or hammering . Such processes are needed in the production of many material goods, including flour , lumber , paper , textiles , and many metal products. These watermills may comprise gristmills , sawmills , paper mills , textile mills , hammermills , trip hammering mills, rolling mills , and wire drawing mills. One major way to classify watermills

4785-509: Is achieved by converting the gravitational potential or kinetic energy of a water source to produce power. Hydropower is a method of sustainable energy production. Hydropower is now used principally for hydroelectric power generation , and is also applied as one half of an energy storage system known as pumped-storage hydroelectricity . Hydropower is an attractive alternative to fossil fuels as it does not directly produce carbon dioxide or other atmospheric pollutants and it provides

4950-501: Is available on demand to be used to generate electricity by passing through channels that connect the dam to the reservoir. The water spins a turbine, which is connected to the generator that produces electricity. The other type is called a run-of-river plant. In this case, a barrage is built to control the flow of water, absent a reservoir . The run-of river power plant needs continuous water flow and therefore has less ability to provide power on demand. The kinetic energy of flowing water

5115-400: Is by an essential trait about their location: tide mills use the movement of the tide; ship mills are water mills onboard (and constituting) a ship. A plentiful head of water can be made to generate compressed air directly without moving parts. In these designs, a falling column of water is deliberately mixed with air bubbles generated through turbulence or a venturi pressure reducer at

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5280-445: Is by using hybrid solar panels called "all-weather solar panels" that can generate electricity from both the sun and the rain. According to zoologist and science and technology educator, Luis Villazon, "A 2008 French study estimated that you could use piezoelectric devices, which generate power when they move, to extract 12 milliwatts from a raindrop. Over a year, this would amount to less than 0.001kWh per square metre – enough to power

5445-420: Is by wheel orientation (vertical or horizontal), one powered by a vertical waterwheel through a gear mechanism, and the other equipped with a horizontal waterwheel without such a mechanism. The former type can be further subdivided, depending on where the water hits the wheel paddles, into undershot, overshot, breastshot and pitchback (backshot or reverse shot) waterwheel mills. Another way to classify water mills

5610-439: Is lost from erosion. Furthermore, studies found that the construction of dams and reservoirs can result in habitat loss for some aquatic species. Large and deep dam and reservoir plants cover large areas of land which causes greenhouse gas emissions from underwater rotting vegetation. Furthermore, although at lower levels than other renewable energy sources, it was found that hydropower produces methane equivalent to almost

5775-482: Is named, married Richard Nixon 's daughter Julie in 1968. Eisenhower was a golf enthusiast later in life, and he joined the Augusta National Golf Club in 1948. He played golf frequently during and after his presidency and was unreserved in his passion for the game, to the point of golfing during winter; he ordered his golf balls painted black so he could see them better against snow. He had

5940-403: Is the decreased efficiency of electricity generation because the process depends on the speed of the seasonal river flow. This means that the rainy season increases electricity generation compared to the dry season. The size of hydroelectric plants can vary from small plants called micro hydro , to large plants that supply power to a whole country. As of 2019, the five largest power stations in

6105-407: Is the energy per unit weight (or unit mass) of water. The static head is proportional to the difference in height through which the water falls. Dynamic head is related to the velocity of moving water. Each unit of water can do an amount of work equal to its weight times the head. The power available from falling water can be calculated from the flow rate and density of water, the height of fall, and

6270-423: Is the main source of energy. Both designs have limitations. For example, dam construction can result in discomfort to nearby residents. The dam and reservoirs occupy a relatively large amount of space that may be opposed by nearby communities. Moreover, reservoirs can potentially have major environmental consequences such as harming downstream habitats. On the other hand, the limitation of the run-of-river project

6435-423: Is used to validate the manufacturer's efficiency guarantee. Detailed calculation of the efficiency of a hydropower turbine accounts for the head lost due to flow friction in the power canal or penstock, rise in tailwater level due to flow, the location of the station and effect of varying gravity, the air temperature and barometric pressure, the density of the water at ambient temperature, and the relative altitudes of

6600-679: The Allied forces 2 to 1. In December 1943, President Roosevelt decided that Eisenhower – not Marshall – would be Supreme Allied Commander in Europe. The following month, he resumed command of ETOUSA and the following month was officially designated as the Supreme Allied Commander of the Allied Expeditionary Force (SHAEF), serving in a dual role until the end of hostilities in Europe in May 1945. He

6765-590: The American-occupied zone of Germany (1945), Army Chief of Staff (1945–1948), president of Columbia University (1948–1953), and as the first supreme commander of NATO (1951–1952). In 1952, Eisenhower entered the presidential race as a Republican to block the isolationist foreign policies of Senator Robert A. Taft , who opposed NATO . Eisenhower won that year's election and the 1956 election in landslides , both times defeating Adlai Stevenson II . Eisenhower's main goals in office were to contain

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6930-814: The Army Industrial College in 1933 and later served on the faculty (it was later expanded to become the Industrial College of the Armed Services and is now known as the Dwight D. Eisenhower School for National Security and Resource Strategy). His primary duty was planning for the next war, which proved most difficult in the midst of the Great Depression . He then was posted as chief military aide to General Douglas MacArthur, Army Chief of Staff. In 1932, he participated in

7095-540: The Ball's Bluff battlefield would have been submerged, as well as the Monocacy Aqueduct . Roads and railroads were expected to be flooded by the reservoir and would have had to be replaced. The 1963 report described the relocations as "extensive." Road relocations were budgeted at $ 8,500,000 and railroads at $ 10,040,000. About 21,000 acres (8,500 ha) of wildlife habitat was expected to be inundated, including

7260-722: The Civil Rights Act of 1957 and sent Army troops to enforce federal court orders which integrated schools in Little Rock, Arkansas . His administration undertook the development and construction of the Interstate Highway System , which remains the largest construction of roadways in American history. In 1957, following the Soviet launch of Sputnik , Eisenhower led the American response which included

7425-924: The Columbia River and its tributaries. The Bureau of Reclamation built the Hoover Dam in 1931, symbolically linking the job creation and economic growth priorities of the New Deal . The federal government quickly followed Hoover with the Shasta Dam and Grand Coulee Dam . Power demand in Oregon did not justify damming the Columbia until WWI revealed the weaknesses of a coal-based energy economy. The federal government then began prioritizing interconnected power—and lots of it. Electricity from all three dams poured into war production during WWII . After

7590-546: The Command and General Staff College at Fort Leavenworth , Kansas, where he graduated first in a class of 245 officers. During the late 1920s and early 1930s, Eisenhower's career stalled somewhat, as military priorities diminished; many of his friends resigned for high-paying business jobs. He was assigned to the American Battle Monuments Commission directed by General Pershing, and with

7755-656: The Democratic Republic of the Congo and Ghana , frequently sell excess power to neighboring countries. Foreign actors such as Chinese hydropower companies have proposed a significant amount of new hydropower projects in Africa, and already funded and consulted on many others in countries like Mozambique and Ghana. Small hydropower also played an important role in early 20th century electrification across Africa. In South Africa, small turbines powered gold mines and

7920-504: The French armed forces . The Allied leaders were "thunderstruck" by this from a political standpoint, though none had offered Eisenhower guidance with the problem in planning the operation. Eisenhower was severely criticized for the move. Darlan was assassinated on December 24 by Fernand Bonnier de La Chapelle , a French antifascist monarchist. Eisenhower later appointed as High Commissioner General Henri Giraud , who had been installed by

8085-598: The Geneva Convention . Eisenhower followed the orders laid down by the Joint Chiefs of Staff (JCS) in directive JCS 1067 but softened them by bringing in 400,000 tons of food for civilians and allowing more fraternization . In response to the devastation in Germany, including food shortages and an influx of refugees, he arranged distribution of American food and medical equipment. His actions reflected

8250-602: The Industrial Revolution would drive development as well. At the beginning of the Industrial Revolution in Britain, water was the main power source for new inventions such as Richard Arkwright 's water frame . Although water power gave way to steam power in many of the larger mills and factories, it was still used during the 18th and 19th centuries for many smaller operations, such as driving

8415-688: The Italian leader , had fallen in Italy, the Allies switched their attention to the mainland with Operation Avalanche . But while Eisenhower argued with President Roosevelt and British Prime Minister Churchill, who both insisted on unconditional surrender in exchange for helping the Italians, the Germans pursued an aggressive buildup of forces in the country. The Germans made the already tough battle more difficult by adding 19 divisions and initially outnumbering

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8580-714: The Japanese attack on Pearl Harbor , Eisenhower was assigned to the General Staff in Washington , where he served until June 1942 with responsibility for creating the major war plans to defeat Japan and Germany. He was appointed Deputy Chief in charge of Pacific Defenses under the Chief of War Plans Division (WPD), General Leonard T. Gerow , and then succeeded Gerow as Chief of the War Plans Division. Next, he

8745-697: The Mauryan , Gupta and Chola empires. Another example of the early use of hydropower is seen in hushing , a historic method of mining that uses flood or torrent of water to reveal mineral veins. The method was first used at the Dolaucothi Gold Mines in Wales from 75 AD onwards. This method was further developed in Spain in mines such as Las Médulas . Hushing was also widely used in Britain in

8910-555: The McKee-Beshers and Dierssen wildlife management areas. 13,120 acres (5,310 ha) of replacement habitat was expected to be required to mitigate habitat loss. The project was judged to have little effect on agriculture and forestry. 460 families were expected to be displaced. Hydropower Hydropower (from Ancient Greek ὑδρο -, "water"), also known as water power , is the use of falling or fast-running water to produce electricity or to power machines. This

9075-891: The Medieval and later periods to extract lead and tin ores. It later evolved into hydraulic mining when used during the California Gold Rush in the 19th century. The Islamic Empire spanned a large region, mainly in Asia and Africa, along with other surrounding areas. During the Islamic Golden Age and the Arab Agricultural Revolution (8th–13th centuries), hydropower was widely used and developed. Early uses of tidal power emerged along with large hydraulic factory complexes. A wide range of water-powered industrial mills were used in

9240-663: The North African Theater of Operations (NATOUSA) through the new operational Headquarters Allied (Expeditionary) Force Headquarters (A(E)FHQ). The word "expeditionary" was dropped soon after his appointment for security reasons. The campaign in North Africa was designated Operation Torch and was planned in the underground headquarters within the Rock of Gibraltar . Eisenhower was the first non-British person to command Gibraltar in 200 years. French cooperation

9405-555: The Panama Canal Zone , where, joined by Mamie, he served until 1924. Under Conner's tutelage, he studied military history and theory (including Carl von Clausewitz 's On War ), and later cited Conner's enormous influence on his military thinking, saying in 1962 that "Fox Conner was the ablest man I ever knew." Conner's comment on Eisenhower was, "[He] is one of the most capable, efficient and loyal officers I have ever met." On Conner's recommendation, in 1925–1926 he attended

9570-745: The River Brethren ( Brethren in Christ Church ) sect of the Mennonites , joined the International Bible Students Association , later known as Jehovah's Witnesses . The Eisenhower home served as the local meeting hall from 1896 to 1915, though Dwight never joined. His later decision to attend West Point saddened his mother, who felt that warfare was "rather wicked", but she did not overrule his decision. Speaking of himself in 1948, Eisenhower said he

9735-406: The Suez Crisis of 1956, he condemned the Israeli, British, and French invasion of Egypt, and he forced them to withdraw. He also condemned the Soviet invasion during the Hungarian Revolution of 1956 but took no action. He deployed 15,000 soldiers during the 1958 Lebanon crisis . Near the end of his term, a summit meeting with the Soviet leader Nikita Khrushchev was cancelled when a US spy plane

9900-618: The creation of NASA and the establishment of a stronger, science-based education via the National Defense Education Act . The Soviet Union began to reinforce their own space program , escalating the Space Race . His two terms saw unprecedented economic prosperity except for a minor recession in 1958 . In his farewell address , he expressed his concerns about the dangers of massive military spending , particularly deficit spending and government contracts to private military manufacturers, which he dubbed "the military–industrial complex ". Historical evaluations of his presidency place him among

10065-401: The upper tier of American presidents . The Eisenhauer (German for "iron hewer" or "iron miner") family migrated from the German village of Karlsbrunn to the Province of Pennsylvania in 1741. Accounts vary as to how and when the German name Eisenhauer was anglicized . David Jacob Eisenhower, Eisenhower's father, was a college-educated engineer, despite his own father's urging to stay on

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10230-433: The 4th century BC refer to the term cakkavattaka (turning wheel), which commentaries explain as arahatta-ghati-yanta (machine with wheel-pots attached), however whether this is water or hand powered is disputed by scholars India received Roman water mills and baths in the early 4th century AD when a certain according to Greek sources. Dams, spillways, reservoirs, channels, and water balance would develop in India during

10395-447: The 70s." Eisenhower served initially in logistics and then the infantry at various camps in Texas and Georgia until 1918. When the US entered World War I , he immediately requested an overseas assignment but was denied and assigned to Ft. Leavenworth, Kansas . In February 1918, he was transferred to Camp Meade in Maryland with the 65th Engineers . His unit was later ordered to France, but, to his chagrin, he received orders for

10560-404: The AFHQ to the SHAEF. Many thought that victory in Europe would come by summer's end, but the Germans did not capitulate for almost a year. From then until the end of the war in Europe on May 8, 1945, Eisenhower, through SHAEF, commanded all Allied forces, and through his command of ETOUSA had administrative command of all US forces on the Western Front north of the Alps . He was ever mindful of

10725-735: The Allied command, on December 20, 1944, he was promoted to General of the Army , equivalent to the rank of Field Marshal in most European armies. In this and the previous high commands he held, Eisenhower showed his great talents for leadership and diplomacy. Although he had never seen action himself, he won the respect of front-line commanders. He interacted adeptly with allies such as Winston Churchill , Field Marshal Bernard Montgomery and General Charles de Gaulle . He had serious disagreements with Churchill and Montgomery over questions of strategy, but these rarely upset his relationships with them. He dealt with Soviet Marshal Zhukov , his Russian counterpart, and they became good friends. In December 1944,

10890-549: The Allies as Darlan's commander-in-chief. Operation Torch also served as a valuable training ground for Eisenhower's combat command skills; during the initial phase of Generalfeldmarschall Erwin Rommel 's move into the Kasserine Pass , Eisenhower created some confusion in the ranks by interference with the execution of battle plans by his subordinates. He also was initially indecisive in his removal of Lloyd Fredendall , commanding II Corps . He became more adroit in such matters in later campaigns. In February 1943, his authority

11055-578: The American West, organized opposition to hydroelectric dams sparked up in the 1950s and 60s based on environmental concerns. Environmental movements successfully shut down proposed hydropower dams in Dinosaur National Monument and the Grand Canyon , and gained more hydropower-fighting tools with 1970s environmental legislation. As nuclear and fossil fuels grew in the 70s and 80s and environmental activists push for river restoration, hydropower gradually faded in American importance. Foreign powers and IGOs have frequently used hydropower projects in Africa as

11220-479: The British worked with Egypt to construct the first Aswan Dam, which they heightened in 1912 and 1934 to try to hold back the Nile floods. Egyptian engineer Adriano Daninos developed a plan for the Aswan High Dam, inspired by the Tennessee Valley Authority's multipurpose dam. When Gamal Abdel Nasser took power in the 1950s, his government decided to undertake the High Dam project, publicizing it as an economic development project. After American refusal to help fund

11385-465: The Cherbourg-Havre area have failed to gain a satisfactory foothold and I have withdrawn the troops. My decision to attack at this time and place was based on the best information available. The troops, the air and the Navy did all that bravery and devotion to duty could do. If any blame or fault attaches to the attempt, it is mine alone. Every ground commander seeks the battle of annihilation; so far as conditions permit, he tries to duplicate in modern war

11550-463: The German unconditional surrender, Eisenhower was appointed military governor of the American-occupied zone of Germany, located primarily in Southern Germany , and headquartered in Frankfurt am Main . Upon discovery of the Nazi concentration camps , he ordered camera crews to document evidence for use in the Nuremberg Trials . He reclassified German prisoners of war (POWs) in US custody as Disarmed Enemy Forces (DEFs), who were no longer subject to

11715-435: The Germans launched a surprise counteroffensive, the Battle of the Bulge , which the Allies turned back in early 1945 after Eisenhower repositioned his armies and improved weather allowed the Army Air Force to engage. German defenses continued to deteriorate on both the Eastern Front with the Red Army and the Western Front with the Western Allies. The British wanted to capture Berlin , but Eisenhower decided it would be

11880-697: The Grand Coulee to build a nuclear site placed on the banks of the Columbia. The nuclear site leaked radioactive matter into the river, contaminating the entire area. Post-WWII Americans, especially engineers from the Tennessee Valley Authority , refocused from simply building domestic dams to promoting hydropower abroad. While domestic dam building continued well into the 1970s, with the Reclamation Bureau and Army Corps of Engineers building more than 150 new dams across

12045-612: The Hun waterwheel; some of the earliest ones are the Jijiupian dictionary of 40 BC, Yang Xiong 's text known as the Fangyan of 15 BC, as well as Xin Lun, written by Huan Tan about 20 AD. It was also during this time that the engineer Du Shi (c. AD 31) applied the power of waterwheels to piston - bellows in forging cast iron. Ancient Indian texts dating back to

12210-700: The Maryland side, Seneca Creek would have been flooded past Dawsonville , and the Monocacy River would have been flooded past Frederick to Ceresville . The main river pool would have extended to Sandy Hook, Maryland. Maps of the reservoir show that portions of Point of Rocks and Buckeystown , Maryland would have been flooded by the full flood pool, and most or all of Lilypons and Seneca in Maryland, Limestone School and Fairview in Virginia and White's Ferry in Maryland and Virginia. The lower portion of

12375-639: The Nile, hydroelectric projects cover the rivers and lakes of Africa. The Inga powerplant on the Congo River had been discussed since Belgian colonization in the late 19th century, and was successfully built after independence. Mobutu's government failed to regularly maintain the plants and their capacity declined until the 1995 formation of the Southern African Power Pool created a multi-national power grid and plant maintenance program. States with an abundance of hydropower, such as

12540-605: The Pacific. Eisenhower also insisted that the British give him exclusive command over all strategic air forces to facilitate Overlord, to the point of threatening to resign unless Churchill relented, which he did. Eisenhower then designed a bombing plan in France in advance of Overlord and argued with Churchill over the latter's concern with civilian casualties; de Gaulle interjected that the casualties were justified, and Eisenhower prevailed. He also had to skillfully manage to retain

12705-485: The Park Service, the hike was accomplished in seven days and brought the preservationist cause extensive publicity. In 1958 the Corps again was directed by Congress to study dams, this time to improve water quality in addition to flood control. Tension between legislation for park use and water management use increased, until President Dwight D. Eisenhower proclaimed Chesapeake and Ohio Canal National Monument under

12870-475: The Philippines, which was denied; because of the ongoing Mexican Revolution , he was posted to Fort Sam Houston in San Antonio , Texas, under the command of General Funston. In 1916, while stationed at Fort Sam Houston, Funston convinced him to become the football coach for Peacock Military Academy ; he later became the coach at St. Louis College, now St. Mary's University , and was an honorary member of

13035-488: The Seneca Dam proposal had been publicly abandoned by the Corps of Engineers. Water quality and supply concerns that had previously been cited as reasons for dam building were addressed by new Federal requirements for stringent sewage treatment, which greatly improved water quality on the lower Potomac, eliminating the need to dilute effluent in reservoirs. Mine waste discharge was also regulated, with dilution provided by

13200-677: The Sigma Beta Chi fraternity there. While Eisenhower was stationed in Texas, he met Mamie Doud of Boone, Iowa . They were immediately taken with each other. He proposed to her on Valentine's Day in 1916. A November wedding date in Denver was moved up to July 1 due to the impending American entry into World War I ; Funston approved 10 days of leave for their wedding. The Eisenhowers moved many times during their first 35 years of marriage. The Eisenhowers had two sons. In late 1917 while he

13365-1276: The United States' hydroelectric plants in Niagara Falls and the Sierra Nevada inspired bigger and bolder creations across the globe. American and USSR financers and hydropower experts also spread the gospel of dams and hydroelectricity across the globe during the Cold War , contributing to projects such as the Three Gorges Dam and the Aswan High Dam . Feeding desire for large scale electrification with water inherently required large dams across powerful rivers, which impacted public and private interests downstream and in flood zones. Inevitably smaller communities and marginalized groups suffered. They were unable to successfully resist companies flooding them out of their homes or blocking traditional salmon passages. The stagnant water created by hydroelectric dams provides breeding ground for pests and pathogens , leading to local epidemics . However, in some cases,

13530-909: The Universe", and another that he could not serve as Army Chief of Staff if others believed he had political ambitions. In 1945, Truman told Eisenhower during the Potsdam Conference that if desired, the president would help the general win the 1948 election , and in 1947 he offered to run as Eisenhower's running mate on the Democratic ticket if MacArthur won the Republican nomination. As the election approached, other prominent citizens and politicians from both parties urged Eisenhower to run. In January 1948, after learning of plans in New Hampshire to elect delegates supporting him for

13695-484: The authority of the Antiquities Act on January 18, 1961. The proclamation earned the enmity of House Interior and Insular Affairs Committee Chairman Wayne Aspinall . Later in 1961 a park authorization bill was proposed with Aspinall's support that would allow dam construction on the Potomac. In May 1962 the Corps proposed a new scheme for 16 dams on the Potomac and its tributaries. This version scrapped most of

13860-470: The baseball team at West Point was one of the greatest disappointments of my life, maybe my greatest". He made the varsity football team and was a starter at halfback in 1912, when he tried to tackle the legendary Jim Thorpe of the Carlisle Indians . Eisenhower suffered a torn knee while being tackled in the next game, which was the last he played; he reinjured his knee on horseback and in

14025-635: The bellows in small blast furnaces (e.g. the Dyfi Furnace ) and gristmills , such as those built at Saint Anthony Falls , which uses the 50-foot (15 m) drop in the Mississippi River . Technological advances moved the open water wheel into an enclosed turbine or water motor . In 1848, the British-American engineer James B. Francis , head engineer of Lowell's Locks and Canals company, improved on these designs to create

14190-456: The boxing ring, so he turned to fencing and gymnastics. Eisenhower later served as junior varsity football coach and cheerleader, which caught the attention of General Frederick Funston . He graduated from West Point in the middle of the class of 1915, which became known as " the class the stars fell on ", because 59 members eventually became general officers . After graduation in 1915, Second Lieutenant Eisenhower requested an assignment in

14355-442: The center and south of the front (respectively). Eisenhower worked tirelessly to address the demands of the rival commanders to optimize Allied forces, often by giving them tactical latitude; many historians conclude this delayed the Allied victory in Europe. However, due to Eisenhower's persistence, the pivotal supply port at Antwerp was successfully, albeit belatedly, opened in late 1944 . In recognition of his senior position in

14520-475: The classic example of Cannae . Once the coastal assault had succeeded, Eisenhower insisted on retaining personal control over the land battle strategy and was immersed in the command and supply of multiple assaults through France on Germany. Field Marshal Montgomery insisted priority be given to his 21st Army Group 's attack being made in the north, while Generals Bradley ( 12th US Army Group ) and Devers ( Sixth US Army Group ) insisted they be given priority in

14685-753: The clearing of the Bonus March encampment in Washington, D.C. Although he was against the actions taken against the veterans and strongly advised MacArthur against taking a public role in it, he later wrote the Army's official incident report, endorsing MacArthur's conduct. In 1935, he accompanied MacArthur to the Philippines, where he served as assistant military adviser to the Philippine government in developing their army. MacArthur allowed Eisenhower to handpick an officer whom he thought would contribute to

14850-440: The cost of building new hydroelectric dams increased 4% annually between 1965 and 1990, due both to the increasing costs of construction and to the decrease in high quality building sites. In the 1990s, only 18% of the world's electricity came from hydropower. Tidal power production also emerged in the 1960s as a burgeoning alternative hydropower system, though still has not taken hold as a strong energy contender. Especially at

15015-737: The dam, and anti-British sentiment in Egypt and British interests in neighboring Sudan combined to make the United Kingdom pull out as well, the Soviet Union funded the Aswan High Dam. Between 1977 and 1990 the dam's turbines generated one third of Egypt's electricity. The building of the Aswan Dam triggered a dispute between Sudan and Egypt over the sharing of the Nile, especially since the dam flooded part of Sudan and decreased

15180-619: The early 20th century, two major factors motivated the expansion of hydropower in Europe: in the northern countries of Norway and Sweden high rainfall and mountains proved exceptional resources for abundant hydropower, and in the south coal shortages pushed governments and utility companies to seek alternative power sources. Early on, Switzerland dammed the Alpine rivers and the Swiss Rhine , creating, along with Italy and Scandinavia ,

15345-532: The effects of upstream sewage discharge, especially during periods of low river flow, and opined that unless sewage was diverted by pipeline to the Chesapeake Bay , a dam would be necessary to dilute the effluent to an acceptable level. However, the Corps projected that the Seneca reservoir would not be able to assure sufficient water flow and quality without support from upstream dams on tributaries. The dam

15510-439: The evangelist Dwight L. Moody . All of the boys were nicknamed "Ike", such as "Big Ike" ( Edgar ) and "Little Ike" (Dwight); the nickname was intended as an abbreviation of their last name. By World War II, only Dwight was still called "Ike". In 1892, the family moved to Abilene, Kansas, which Eisenhower considered his hometown. As a child, he was involved in an accident that cost his younger brother Earl an eye, for which he

15675-603: The eventual construction of Jennings Randolph Lake on the North Branch of the Potomac by the Corps of Engineers. The Riverbend Dam was to be a 119-foot (36 m) dam at the westward bend of the Potomac just above Great Falls. Its reservoir was to extend nearly to Harpers Ferry, with branches extending up the Monocacy River past Frederick and major branches on streams in Loudoun County, Virginia . The dam

15840-570: The falls far enough away to actually reach enough people and justify installation. The project succeeded in large part due to Nikola Tesla's invention of the alternating current motor . On the other side of the country, San Francisco engineers, the Sierra Club , and the federal government fought over acceptable use of the Hetch Hetchy Valley . Despite ostensible protection within a national park, city engineers successfully won

16005-667: The family farm. Eisenhower's mother, Ida Elizabeth (Stover) Eisenhower , of predominantly German Protestant ancestry, moved to Kansas from Virginia. She married David on September 23, 1885, in Lecompton, Kansas , on the campus of their alma mater, Lane University . David owned a general store in Hope, Kansas , but the business failed due to economic conditions and the family became impoverished. The Eisenhowers lived in Texas from 1889 until 1892, and later returned to Kansas, with $ 24 (equivalent to $ 814 in 2023) to their name. David worked as

16170-590: The first century BC. The Barbegal mill , located in modern-day France, had 16 water wheels processing up to 28 tons of grain per day. Roman waterwheels were also used for sawing marble such as the Hierapolis sawmill of the late 3rd century AD. Such sawmills had a waterwheel that drove two crank-and-connecting rods to power two saws. It also appears in two 6th century Eastern Roman sawmills excavated at Ephesus and Gerasa respectively. The crank and connecting rod mechanism of these Roman watermills converted

16335-446: The first electric railway in the 1890s, and Zimbabwean farmers installed small hydropower stations in the 1930s. While interest faded as national grids improved in the second half of the century, 21st century national governments in countries including South Africa and Mozambique, as well as NGOs serving countries like Zimbabwe, have begun re-exploring small-scale hydropower to diversify power sources and improve rural electrification. In

16500-403: The first half of the 20th century began to speak out against them, and citizen groups organizing against dam projects increased. In the 1980s and 90s the international anti-dam movement had made finding government or private investors for new large hydropower projects incredibly difficult, and given rise to NGOs devoted to fighting dams. Additionally, while the cost of other energy sources fell,

16665-527: The first to use such a weapon." Initially, Eisenhower hoped for cooperation with the Soviets. He even visited Warsaw in 1945. Invited by Bolesław Bierut and decorated with the highest military decoration , he was shocked by the scale of destruction in the city. However, by mid-1947, as east–west tensions over economic recovery in Germany and the Greek Civil War escalated, Eisenhower agreed with

16830-446: The forebay and tailbay. For precise calculations, errors due to rounding and the number of significant digits of constants must be considered. Some hydropower systems such as water wheels can draw power from the flow of a body of water without necessarily changing its height. In this case, the available power is the kinetic energy of the flowing water. Over-shot water wheels can efficiently capture both types of energy. The flow in

16995-417: The forthcoming Republican National Convention , Eisenhower stated through the Army that he was "not available for and could not accept nomination to high political office"; "life-long professional soldiers", he wrote, "in the absence of some obvious and overriding reason, [should] abstain from seeking high political office". Eisenhower maintained no political party affiliation during this time. Many believed he

17160-544: The funds. They made a pact to take alternate years at college while the other worked to earn the tuitions. Edgar took the first turn at school, and Dwight was employed as a night supervisor at the Belle Springs Creamery. When Edgar asked for a second year, Dwight consented. At that time, a friend Edward "Swede" Hazlett was applying to the Naval Academy and urged Dwight to apply, since no tuition

17325-409: The game six nights a week for five months. Eisenhower continued to play bridge throughout his military career. While stationed in the Philippines, he played regularly with President Manuel Quezon , earning him the nickname the "Bridge Wizard of Manila". An unwritten qualification for an officer's appointment to Eisenhower's staff during World War II was the ability to play bridge. He played even during

17490-432: The hazing, though he willingly accepted it as a plebe. He was also a regular violator of the more detailed regulations and finished school with a less than stellar discipline rating. Academically, Eisenhower's best subject by far was English. Otherwise, his performance was average, though he thoroughly enjoyed the typical emphasis of engineering on science and mathematics. In athletics, Eisenhower later said that "not making

17655-563: The help of his brother Milton Eisenhower , then a journalist at the Agriculture Department , he produced a guide to American battlefields in Europe. He then was assigned to the Army War College and graduated in 1928. After a one-year assignment in France, Eisenhower served as executive officer to General George V. Moseley , Assistant Secretary of War , from 1929 to February 1933. Major Eisenhower graduated from

17820-460: The high-efficiency Pelton wheel impulse turbine , which used hydropower from the high head streams characteristic of the Sierra Nevada . The modern history of hydropower begins in the 1900s, with large dams built not simply to power neighboring mills or factories but provide extensive electricity for increasingly distant groups of people. Competition drove much of the global hydroelectric craze: Europe competed amongst itself to electrify first, and

17985-400: The high-level intake. This allows it to fall down a shaft into a subterranean, high-roofed chamber where the now-compressed air separates from the water and becomes trapped. The height of the falling water column maintains compression of the air in the top of the chamber, while an outlet, submerged below the water level in the chamber allows water to flow back to the surface at a lower level than

18150-401: The highest among all renewable energy technologies. Hydroelectricity generation starts with converting either the potential energy of water that is present due to the site's elevation or the kinetic energy of moving water into electrical energy. Hydroelectric power plants vary in terms of the way they harvest energy. One type involves a dam and a reservoir . The water in the reservoir

18315-561: The improvement of highways became a signature issue for Eisenhower as president. He assumed duties again at Camp Meade , Maryland, commanding a battalion of tanks, where he remained until 1922. His schooling continued, focused on the nature of the next war and the role of the tank. His new expertise in tank warfare was strengthened by a close collaboration with George S. Patton , Sereno E. Brett , and other senior tank leaders. Their leading-edge ideas of speed-oriented offensive tank warfare were strongly discouraged by superiors, who considered

18480-400: The inevitable loss of life and suffering that would be experienced by the troops under his command and their families. This prompted him to make a point of visiting every division involved in the invasion. Eisenhower's sense of responsibility was underscored by his draft of a statement to be issued if the invasion failed. It has been called one of the great speeches of history: Our landings in

18645-598: The intake. A separate outlet in the roof of the chamber supplies the compressed air. A facility on this principle was built on the Montreal River at Ragged Shutes near Cobalt, Ontario , in 1910 and supplied 5,000 horsepower to nearby mines. Hydroelectricity is the biggest hydropower application. Hydroelectricity generates about 15% of global electricity and provides at least 50% of the total electricity supply for more than 35 countries.  In 2021, global installed hydropower electrical capacity reached almost 1400 GW,

18810-470: The last 20 years of his life. The images were mostly landscapes but also portraits of subjects such as Mamie, their grandchildren, General Montgomery, George Washington , and Abraham Lincoln . Wendy Beckett stated that Eisenhower's paintings, "simple and earnest", caused her to "wonder at the hidden depths of this reticent president". A conservative in both art and politics, Eisenhower in a 1962 speech denounced modern art as "a piece of canvas that looks like

18975-497: The last unexploited energy sources in nature. When it rains, billions of litres of water can fall, which have an enormous electric potential if used in the right way." Research is being done into the different methods of generating power from rain, such as by using the energy in the impact of raindrops. This is in its very early stages with new and emerging technologies being tested, prototyped and created. Such power has been called rain power. One method in which this has been attempted

19140-673: The legitimate government of China, and he won congressional approval of the Formosa Resolution . His administration provided major aid to help the French fight off Vietnamese Communists in the First Indochina War . After the French left, he gave strong financial support to the new state of South Vietnam . He supported regime-changing military coups in Iran and Guatemala orchestrated by his own administration. During

19305-572: The local acceleration due to gravity: To illustrate, the power output of a turbine that is 85% efficient, with a flow rate of 80 cubic metres per second (2800 cubic feet per second) and a head of 145 metres (476 feet), is 97 megawatts: Operators of hydroelectric stations compare the total electrical energy produced with the theoretical potential energy of the water passing through the turbine to calculate efficiency. Procedures and definitions for calculation of efficiency are given in test codes such as ASME PTC 18 and IEC 60041. Field testing of turbines

19470-436: The lower plain. Italy prioritized early near-nationwide electrification, almost entirely from hydropower, which powered their rise as a dominant European and imperial force. However, they failed to reach any conclusive standard for determining water rights before WWI. Dwight D. Eisenhower Dwight David Eisenhower (born David Dwight Eisenhower ; October 14, 1890 – March 28, 1969), also known by his nickname Ike ,

19635-522: The main stem of the Potomac, its branches and its major tributaries. Beginning at tidewater, a dam at Chain Bridge would extend to Bear Island , where another dam would back a reservoir up to Great Falls. Just above Great Falls the Riverbend Dam would create a reservoir up to Sandy Hook , just below Harpers Ferry . Dams at Sandy Hook, Rocky Marsh Run, Pinesburg and Little Orleans would convert

19800-585: The main stem of the river to a series of slackwater reservoirs. More dams on the North and South Forks of the Potomac, the North River and the Shenandoah River would complete the scheme. The Corps suggested that the discharge from the Riverbend Dam could enhance flow over Great Falls during daylight hours. Locks were to be provided to allow small craft to reach Harpers Ferry. The cost of this program

19965-475: The mainstem dams in favor of more tributary dams, and moved the Riverbend Dam to a site at Seneca, 4.5 miles (7.2 km) upstream. The Seneca Dam was to be lower than Riverbend. Douglas immediately attacked the proposal, as did Maryland Representative Charles Mathias . A task force review in 1966 opposed the Seneca Dam. In 1968 draft legislation proposed the Potomac National River, eliminating

20130-689: The mission. Hence he chose James Ord , a classmate of his at West Point. Having been brought up in Mexico, which inculcated into him the Spanish culture which influenced both Mexico and the Philippines, Ord was deemed the right pick for the job. Eisenhower had strong philosophical disagreements with MacArthur regarding the role of the Philippine Army and the leadership qualities that an American army officer should exhibit and develop in his subordinates. The antipathy between Eisenhower and MacArthur lasted

20295-492: The new tank corps , where he was promoted to brevet lieutenant colonel in the National Army . He commanded a unit that trained tank crews at Camp Colt  – his first command. Though Eisenhower and his tank crews never saw combat, he displayed excellent organizational skills as well as an ability to accurately assess junior officers' strengths and make optimal placements of personnel. His spirits were raised when

20460-530: The new American attitudes of the German people as Nazi victims not villains, while aggressively purging the ex-Nazis. In November 1945, Eisenhower returned to Washington to replace Marshall as Chief of Staff of the Army . His main role was the rapid demobilization of millions of soldiers, which was delayed by lack of shipping. Eisenhower was convinced in 1946 that the Soviet Union did not want war and that friendly relations could be maintained; he strongly supported

20625-669: The new United Nations and favored its involvement in the control of atomic bombs. However, in formulating policies regarding the atomic bomb and relations with the Soviets, Truman was guided by the State Department and ignored Eisenhower and the Pentagon . Indeed, Eisenhower had opposed the use of the atomic bomb against the Japanese, writing, "First, the Japanese were ready to surrender and it wasn't necessary to hit them with that awful thing. Second, I hated to see our country be

20790-467: The new approach too radical and preferred to continue using tanks in a strictly supportive role for the infantry. Eisenhower was even threatened with court-martial for continued publication of these proposed methods of tank deployment, and he relented. From 1920, Eisenhower served under a succession of talented generals – Fox Conner , John J. Pershing , Douglas MacArthur and George Marshall . He first became executive officer to General Conner in

20955-600: The next most difficult campaign against the Germans—a beach landing assault. His first struggles, however, were with Allied leaders and officers on matters vital to the success of the Normandy invasion; he argued with Roosevelt over an essential agreement with De Gaulle to use French resistance forces in covert operations against the Germans in advance of Operation Overlord. Admiral Ernest J. King fought with Eisenhower over King's refusal to provide additional landing craft from

21120-423: The operation of mechanical devices, such as gristmills , sawmills , textile mills, trip hammers , dock cranes , domestic lifts , and ore mills . A trompe , which produces compressed air from falling water, is sometimes used to power other machinery at a distance. A hydropower resource can be evaluated by its available power . Power is a function of the hydraulic head and volumetric flow rate . The head

21285-468: The possibility of a Seneca Dam in favor of more tributary dams. However, this proposal was opposed by landowners and other interests in the areas earmarked for dams on the Monocacy , Cacapon and upper Potomac rivers. In 1968 Congress converted the national monument into Chesapeake and Ohio Canal National Historical Park , effectively precluding dam construction anywhere along the length of the park. By 1969

21450-642: The regimental executive officer. In March 1941 he was promoted to colonel and assigned as chief of staff of the newly activated IX Corps under Major General Kenyon Joyce . In June 1941, he was appointed chief of staff to General Walter Krueger , Commander of the Third Army , at Fort Sam Houston in San Antonio, Texas. After successfully participating in the Louisiana Maneuvers , he was promoted to brigadier general on October 3, 1941. After

21615-606: The region including fulling mills, gristmills , paper mills , hullers , sawmills , ship mills , stamp mills , steel mills , sugar mills , and tide mills . By the 11th century, every province throughout the Islamic Empire had these industrial mills in operation, from Al-Andalus and North Africa to the Middle East and Central Asia . Muslim engineers also used water turbines while employing gears in watermills and water-raising machines. They also pioneered

21780-470: The rest of their lives. Historians have concluded that this assignment provided valuable preparation for handling the challenging personalities of Winston Churchill , George S. Patton, George Marshall, and Bernard Montgomery during World War II. Eisenhower later emphasized that too much had been made of the disagreements with MacArthur and that a positive relationship endured. While in Manila, Mamie suffered

21945-477: The rights to both water and power in the Hetch Hetchy Valley in 1913. After their victory they delivered Hetch Hetchy hydropower and water to San Francisco a decade later and at twice the promised cost, selling power to PG&E which resold to San Francisco residents at a profit. The American West, with its mountain rivers and lack of coal, turned to hydropower early and often, especially along

22110-514: The rotary motion of the waterwheel into the linear movement of the saw blades. Water-powered trip hammers and bellows in China, during the Han dynasty (202 BC – 220 AD), were initially thought to be powered by water scoops . However, some historians suggested that they were powered by waterwheels. This is since it was theorized that water scoops would not have had the motive force to operate their blast furnace bellows. Many texts describe

22275-513: The same period. Evidence of water wheels and watermills date to the ancient Near East in the 4th century BC. Moreover, evidence indicates the use of hydropower using irrigation machines to ancient civilizations such as Sumer and Babylonia . Studies suggest that the water wheel was the initial form of water power and it was driven by either humans or animals. In the Roman Empire , water-powered mills were described by Vitruvius by

22440-431: The services of the often unruly George S. Patton, by severely reprimanding him when Patton earlier had slapped a subordinate , and then when Patton gave a speech in which he made improper comments about postwar policy. The D-Day Normandy landings on June 6, 1944, were costly but successful. Two months later (August 15), the invasion of Southern France took place, and control of forces in the southern invasion passed from

22605-553: The spread of communism and reduce federal deficits . In 1953, he considered using nuclear weapons to end the Korean War and may have threatened China with nuclear attack if an armistice was not reached quickly. China did agree and an armistice resulted, which remains in effect. His New Look policy of nuclear deterrence prioritized "inexpensive" nuclear weapons while reducing funding for expensive Army divisions. He continued Harry S. Truman 's policy of recognizing Taiwan as

22770-489: The start of the American hydropower experiment, engineers and politicians began major hydroelectricity projects to solve a problem of 'wasted potential' rather than to power a population that needed the electricity. When the Niagara Falls Power Company began looking into damming Niagara, the first major hydroelectric project in the United States, in the 1890s they struggled to transport electricity from

22935-657: The stressful weeks leading up to the D-Day landings. His favorite partner was General Alfred Gruenther , considered the best player in the US Army; he appointed Gruenther his second-in-command at NATO partly because of his skill at bridge. Saturday night bridge games at the White House were a feature of his presidency. He was a strong player, though not an expert by modern standards. The great bridge player and popularizer Ely Culbertson described his game as classic and sound with "flashes of brilliance" and said that "you can always judge

23100-671: The unit under his command received orders overseas to France. This time his wishes were thwarted when the armistice was signed a week before his departure date. Completely missing out on the warfront left him depressed and bitter for a time, despite receiving the Distinguished Service Medal for his work at home. In World War II, rivals who had combat service in the Great War (led by Gen. Bernard Montgomery ) sought to denigrate Eisenhower for his previous lack of combat duty, despite his stateside experience establishing

23265-542: The use of dams as a source of water power, used to provide additional power to watermills and water-raising machines. Islamic irriguation techniques including Persian Wheels would be introduced to India, and would be combined with local methods, during the Delhi Sultanate and the Mughal Empire . Furthermore, in his book, The Book of Knowledge of Ingenious Mechanical Devices , the Muslim mechanical engineer, Al-Jazari (1136–1206) described designs for 50 devices. Many of these devices were water-powered, including clocks,

23430-536: The visual intrusion of the Riverbend Dam at Great Falls, Seneca Dam was placed at Blockhouse Point, about 1.6 miles (2.6 km) downstream from the mouth of Seneca Creek , about 4.5 miles (7.2 km) upstream from the Riverbend site and just downstream from the Chesapeake and Ohio Canal 's Dam Number 2. No immediate hydroelectric development was planned, the dam was meant to provide a water source, to control floods, and to provide recreation. The Corps of Engineers assumed that water quality would continue to decline under

23595-421: The volume of water available to them. Ethiopia , also located on the Nile, took advantage of the Cold War tensions to request assistance from the United States for their own irrigation and hydropower investments in the 1960s. While progress stalled due to the coup d'état of 1974 and following 17-year-long Ethiopian Civil War Ethiopia began construction on the Grand Ethiopian Renaissance Dam in 2011. Beyond

23760-415: The war, the Grand Coulee Dam and accompanying hydroelectric projects electrified almost all of the rural Columbia Basin , but failed to improve the lives of those living and farming there the way its boosters had promised and also damaged the river ecosystem and migrating salmon populations. In the 1940s as well, the federal government took advantage of the sheer amount of unused power and flowing water from

23925-618: The world are conventional hydroelectric power stations with dams. Hydroelectricity can also be used to store energy in the form of potential energy between two reservoirs at different heights with pumped-storage . Water is pumped uphill into reservoirs during periods of low demand to be released for generation when demand is high or system generation is low. Other forms of electricity generation with hydropower include tidal stream generators using energy from tidal power generated from oceans, rivers, and human-made canal systems to generating electricity. Rain has been referred to as "one of

24090-739: The worst-case, "probable maximum flood" that can be expected at the site; a spillway is often included to route flood flows around the dam. A computer model of the hydraulic basin and rainfall and snowfall records are used to predict the maximum flood. Some disadvantages of hydropower have been identified. Dam failures can have catastrophic effects, including loss of life, property and pollution of land. Dams and reservoirs can have major negative impacts on river ecosystems such as preventing some animals traveling upstream, cooling and de-oxygenating of water released downstream, and loss of nutrients due to settling of particulates. River sediment builds river deltas and dams prevent them from restoring what

24255-587: Was "one of the most deeply religious men I know" though unattached to any "sect or organization". He was baptized in the Presbyterian Church in 1953. Eisenhower attended Abilene High School and graduated in 1909. As a freshman, he injured his knee and developed a leg infection that extended into his groin, which his doctor diagnosed as life-threatening. The doctor insisted that the leg be amputated but Dwight refused to allow it, and surprisingly recovered, though he had to repeat his freshman year. He and brother Edgar both wanted to attend college, though they lacked

24420-463: Was appointed Assistant Chief of Staff in charge of the new Operations Division (which replaced WPD) under Chief of Staff General George C. Marshall, who spotted talent and promoted accordingly. At the end of May 1942, Eisenhower accompanied Lt. Gen. Henry H. Arnold , commanding general of the Army Air Forces , to London to assess the effectiveness of the theater commander in England, Maj. Gen. James E. Chaney . He returned to Washington on June 3 with

24585-403: Was born in Denison, Texas , and raised in Abilene, Kansas . His family had a strong religious background, and his mother became a Jehovah's Witness . Eisenhower, however, belonged to no organized church until 1952. He graduated from West Point in 1915 and later married Mamie Doud , with whom he had two sons. During World War I , he was denied a request to serve in Europe and instead commanded

24750-399: Was charged in these positions with planning and carrying out the Allied assault on the coast of Normandy in June 1944 under the code name Operation Overlord, the liberation of Western Europe and the invasion of Germany. Eisenhower, as well as the officers and troops under him, had learned valuable lessons in their previous operations, and their skills had all strengthened in preparation for

24915-432: Was deemed necessary to the campaign and Eisenhower encountered a "preposterous situation" with the multiple rival factions in France. His primary objective was to move forces successfully into Tunisia and intending to facilitate that objective, he gave his support to François Darlan as High Commissioner in North Africa, despite Darlan's previous high offices in Vichy France and his continued role as commander-in-chief of

25080-432: Was estimated at $ 235 million in 1945. The Corps plan, which would have inundated nearly all of the defunct Chesapeake and Ohio Canal was opposed by the National Park Service , which had acquired the canal property in 1938. A 1954 hearing at the Department of the Interior was attended by more than 1000 people, only three of whom spoke in favor of the Corps plan. In the meantime the Park Service had proposed its own plan for

25245-584: Was expected to be about 5 feet (1.5 m), with another 7 feet (2.1 m) for the rest of the year. The pool would have varied from 38,700 acres (15,700 ha) at maximum flood pool to 24,000 acres (9,700 ha) at full conservation pool, and 9,100 acres (3,700 ha) at minimum pool. Construction was expected to take six years. The reservoir was planned to store 550,000 acre-feet (0.68 km), of which 50,000 acre-feet (0.062 km) were allocated for sedimentation. An additional 643,000 acre-feet (0.793 km) were available for flood storage. The reservoir

25410-401: Was extended as commander of AFHQ across the Mediterranean basin to include the British Eighth Army , commanded by General Sir Bernard Montgomery. The Eighth Army had advanced across the Western Desert from the east and was ready for the start of the Tunisia Campaign . After the capitulation of Axis forces in North Africa, Eisenhower oversaw the invasion of Sicily . Once Mussolini ,

25575-497: Was implemented in the commercial plant of Niagara Falls in 1895 and it is still operating. In the early 20th century, English engineer William Armstrong built and operated the first private electrical power station which was located in his house in Cragside in Northumberland , England. In 1753, the French engineer Bernard Forest de Bélidor published his book, Architecture Hydraulique , which described vertical-axis and horizontal-axis hydraulic machines. The growing demand for

25740-591: Was in charge of training at Fort Oglethorpe in Georgia , his wife Mamie had their first son, Doud Dwight "Icky" Eisenhower , who died of scarlet fever at the age of three. Eisenhower was mostly reluctant to discuss his death. Their second son, John Eisenhower , was born in Denver , Colorado. John served in the United States Army , retired as a brigadier general, became an author and served as Ambassador to Belgium from 1969 to 1971. He married Barbara Jean Thompson and had four children: David , Barbara Ann, Susan Elaine and Mary Jean . David, after whom Camp David

25905-458: Was offered a post by the Philippine Commonwealth Government, namely by then Philippine President Manuel L. Quezon on recommendations by MacArthur, to become the chief of police of a new capital being planned, now named Quezon City , but he declined the offer. Eisenhower returned to the United States in December 1939 and was assigned as commanding officer of the 1st Battalion, 15th Infantry Regiment at Fort Lewis , Washington, later becoming

26070-500: Was planned as a straight-crested concrete gravity dam with a central overflow spillway regulated by 27 gates. Provision for future power generation was to be included in the south abutment, with water supply provisions on either end of the dam. No lock was to be provided for small craft. For flood control the project was designed to pass 150,000 cu ft/s (4,200 m/s) of a 400,000 cu ft/s (11,000 m/s) flood to minimize damage downstream. Drawdown from May to September

26235-525: Was projected to cost more than $ 100 million in 1962 dollars. The project was opposed by Maryland and Virginia, as well as by conservation organizations and fell out of favor with the Corps of Engineers in 1969. As with the Riverbend proposal, the reservoir was to spread along tributary creeks and reservoirs, in some cases considerable distances. On the Virginia side, Sugarland Run would have been flooded to Herndon , Broad Run to Sterling , Goose Creek to Evergreen Mill and Catoctin Creek to Taylorstown . On

26400-400: Was remorseful for the remainder of his life. Eisenhower developed a keen and enduring interest in exploring the outdoors. He learned about hunting and fishing, cooking, and card playing from a man named Bob Davis who camped on the Smoky Hill River . While his mother was against war, it was her collection of history books that first sparked Eisenhower's interest in military history; he became

26565-410: Was required. Eisenhower requested consideration for either Annapolis or West Point with his Senator, Joseph L. Bristow . Though Eisenhower was among the winners of the entrance-exam competition, he was beyond the age limit for the Naval Academy. He accepted an appointment to West Point in 1911. At West Point, Eisenhower relished the emphasis on traditions and on sports, but was less enthusiastic about

26730-413: Was revived following World War II. Opposition to the flooding of the entire river to Cumberland by a chain of dams, and to the inundation of the Chesapeake and Ohio Canal doomed the Riverbend proposal. However, in 1963 the Corps proposed a new plan to improve water quality on the Potomac, which moved water storage off the main stem of the Potomac to its upper tributaries and scaled the Riverbend dam back to

26895-407: Was shot down over the Soviet Union. Eisenhower approved the Bay of Pigs Invasion , which was left to John F. Kennedy to carry out. On the domestic front, Eisenhower governed as a moderate conservative who continued New Deal agencies and expanded Social Security . He covertly opposed Joseph McCarthy and contributed to the end of McCarthyism by openly invoking executive privilege . He signed

27060-444: Was the 34th president of the United States , serving from 1953 to 1961. During World War II , he was Supreme Commander of the Allied Expeditionary Force in Europe and achieved the five-star rank as General of the Army . Eisenhower planned and supervised two of the most consequential military campaigns of World War II : Operation Torch in the North Africa campaign in 1942–1943 and the invasion of Normandy in 1944. Eisenhower

27225-404: Was to incorporate small locks to allow pleasure boats to reach Harpers Ferry. After intense public opposition the Riverbend project was shelved in favor of less ambitious proposals The final proposal for a lower Potomac dam was Seneca Dam. The concept developed in the 1950s and was proposed by the Corps of Engineers in its final form in the 1963 Potomac River Basin Report . Answering objections to

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