PANAMA CANAL

The Panama Canal is a 77.1-kilometre (48 mi) ship canal in Panama that connects the Atlantic Ocean (via the Caribbean Sea) to the Pacific Ocean. The canal cuts across the Isthmus of Panama and is a key conduit for international maritime trade. There are locks at each end to lift ships up to Gatun Lake, 26 metres (85 ft) above sea level. Gatun Lake was created to reduce the amount of work required for the canal. The current locks are 33.5 metres (110 ft) wide. A third, wider lane of locks is currently under construction and is due to open in 2015.

Layout

The canal consists of artificial lakes, several improved and artificial channels, and three sets of locks. An additional artificial lake, Alajuela Lake (known during the American era as Madden Lake), acts as a reservoir for the canal. The layout of the canal as seen by a ship passing from the Atlantic to the Pacific is as follows:
While, globally, the Atlantic Ocean is east of the isthmus and the Pacific to the west, the general direction of the canal passage from the Atlantic to the Pacific is from northwest to southeast. This is because of a local anomaly in the shape of the isthmus at the point the canal occupies. The Bridge of the Americas (Spanish: Puente de las Américas) at the Pacific side is about a third of a degree east of the Colón end on the Atlantic side.^[35] Still, in formal nautical communications, the simplified directions "Southbound" and "Northbound" are used.

Lock size

Initially the locks at Gatun had been designed to be 28.5 m (94 ft) wide. In 1908, the United States Navy requested that width be increased to at least 36 m (118 ft), which would allow the passage of U.S. naval ships. Eventually a compromise was made and the locks were built 33.53 m (110.0 ft) wide. Each lock is 320 m (1,050 ft) long, with the walls ranging in thickness from 15 m (49 ft) at the base to 3 m (9.8 ft) at the top. The central wall between the parallel locks at Gatun is 18 m (59 ft) thick and over 24 m (79 ft) high. The steel lock gates measure an average of 2 m (6.6 ft) thick, 19.5 m (64 ft) wide, and 20 m (66 ft) high. It is the size of the locks, specifically the Pedro Miguel Locks, along with the height of the Bridge of the Americas at Balboa, that determine the Panamax metric and limit the size of ships that may use the canal.The size of the locks determines the maximum size of a ship that can pass through them. Because of the importance of the canal to international trade, many ships are built to the maximum size allowed. These are known as Panamax vessels. A Panamax cargo ship typically has a DWT of 65,000–80,000 tonnes, but its actual cargo is restricted to about 52,500 tonnes because of the 12.6 m (41.2 ft) draft restrictions within the canal. The longest ship ever to transit the canal was the San Juan Prospector (now Marcona Prospector), an ore-bulk-oil carrier that is 296.57 m (973 ft) long with a beam of 32.31 m (106 ft).^[41]

Capacity

The canal is currently handling more vessel traffic than had ever been envisioned by its builders. In 1934 it was estimated that the maximum capacity of the canal would be around 80 million tons per year; as noted above, canal traffic in 2009 reached 299.1 million tons of shipping.

Implementation of an enhanced locks lighting system;To improve capacity, a number of improvements have been imposed on the current canal system. These improvements aim to maximize the possible use of current locking system:

• Construction of two tie-up stations in Gaillard Cut;
• Widening Gaillard Cut from 192 to 218 metres (630 to 715 ft);
• Improvements to the tugboat fleet;
• Implementation of the carousel lockage system in Gatun locks;
• Development of an improved vessel scheduling system;
• Deepening of Gatun Lake navigational channels from 10.4 to 11.3 metres (34 to 37 ft) PLD;
• Modification of all locks structures to allow an additional draft of about 0.30 metres (0.98 ft);
• Deepening of the Pacific and Atlantic entrances;
• Construction of a new spillway in Gatun, for flood control.

These improvements will enlarge the capacity from 280–90 million PCUMS (2008) to 330–40 PCUMS (2012).

Source Code : http://en.wikipedia.org/wiki/Panama_Canal

NETHERLANDS NORTH SEA PROTECTION WORKS

This singularly unique, vast and complex system of dams, floodgates, storm surge barriers and other engineered works literally allows the Netherlands to exist. For centuries, the people of the Netherlands have repeatedly attempted to push back the sea, only to watch brutal storm surges flood their efforts, since the nation sits below sea level and its land mass is still sinking. The North Sea Protection Works consists of two monumental steps the Dutch took to win their struggle to hold back the sea.

Step one, a 19-mile-long enclosure dam, was built between 1927 and 1932. The immense dike, 100-yards thick at the waterline, collars the neck of the estuary once known as Zuiderzee. Step two, the Delta Project, was intended to control the treacherous area where the mouths of the Meuse and Rhine Rivers break into a delta.

The project's crowning touch was the Eastern Schelde Barrier, a two-mile barrier of tell gates slung between massive concrete piers, which fall only when storm-waters threaten. The North Sea Protection Works exemplifies the ability of humanity to exist side-by-side with the forces of nature.

Source From : http://www.asce.org/People-and-Projects/Projects/Seven-Wonders/Netherlands-North-Sea-Protection-Works/

ITAIPU DAM

The Itaipu Dam  is a hydroelectric dam on the Paraná River located on the border between Brazil and Paraguay. The name "Itaipu" was taken from an isle that existed near the construction site. In the Guaraní language, Itaipu means "the sounding stone".

The dam is the largest operating hydroelectric facility in terms of annual energy generation, generating 94.7 TWh in 2008 and 91.6 TWh in 2009, while the annual energy generation of the Three Gorges Dam was 80.8 TWh in 2008 and 79.4 TWh in 2009. The dam's 14,000 MW installed capacity is second to the Three Gorges Dam's 22,500 MW, though. It is a binational undertaking run by Brazil and Paraguay at the Paraná River on the border section between the two countries, 15 km (9.3 mi) north of the Friendship Bridge. The project ranges from Foz do Iguaçu, in Brazil, and Ciudad del Este in Paraguay, in the south toGuaíra and Salto del Guairá in the north. The installed generation capacity of the plant is 14 GW, with 20 generating units providing 700 MW each with a hydraulic design head of 118 m. In 2008 the plant generated a record 94.68 TWh, supplying 90% of the electricity consumed by Paraguay and 19% of that consumed by Brazil.

In 1970, the consortium formed by the companies IECO (from the United States of America) and ELC Electroconsult S.p.A. (from Italy) won the international competition for the realization of the viability studies and for the elaboration of the construction project. Work began in February 1971. On April 26, 1973, Brazil and Paraguay signed the Itaipu Treaty, the legal instrument for the hydroelectric exploitation of the Paraná River by the two countries. On May 17, 1974, the Itaipu Binacional entity was created to administer the plant's construction. The works began in January of the following year. Brazil's (and Latin America's) first electric car was introduced in late 1974; it received the name "Itaipu" in honor of the project.

Formation of the lake

The plant's reservoir began its formation on October 13, 1982, when the dam works were completed and the side canal's gates were closed. Throughout this period, heavy rains and flooding accelerated the filling of the reservoir as the water rose 100 meters (330 ft) and reached the gates of the spillway at 10 a.m. on October 27.

Start of operations

On May 5, 1984, the first generation unit started running in Itaipu. The first 18 units were installed at the rate of two to three a year; the last two of these started running in the year 1991.

Construction

• The course of the seventh biggest river in the world was shifted, as were 50 million tons of earth and rock.
• The amount of concrete used to build the Itaipu Power Plant would be enough to build 210 football stadiums the size of the Estádio do Maracanã.
• The iron and steel used would allow for the construction of 380 Eiffel Towers.
• The volume of excavation of earth and rock in Itaipu is 8.5 times greater than that of the Channel Tunnel and the volume of concrete is 15 times greater.
• Around forty thousand people worked in the construction.
• Itaipu is one of the most expensive objects ever built.

Source From : http://en.wikipedia.org/wiki/Itaipu_Dam

GOLDEN GATE BRIDGE

Construction began on January 5, 1933. The project cost more than $35 million, completing ahead of schedule and under budget. The Golden Gate Bridge construction project was carried out by the McClintic-Marshall Construction Co., a subsidiary of Bethlehem Steel Corporation founded by Howard H. McClintic and Charles D. Marshall, both of Lehigh University.

The project was finished by April 1937, $1.3 million under budget. The Bridge Round House diner was then included in the southeastern end of the Golden Gate Bridge, adjacent to the tourist plaza which was renovated in 2012. The Bridge Round House, an Art Deco design by Alfred Finnila completed in 1938, has been popular throughout the years as a starting point for various commercial tours of the bridge and an unofficial gift shop.^[ The diner was renovated in 2012 and the gift shop was then removed as a new, official gift shop has been included in the adjacent plaza renovations.Strauss remained head of the project, overseeing day-to-day construction and making some groundbreaking contributions. A graduate of the University of Cincinnati, he placed a brick from his alma mater's demolished McMicken Hall in the south anchorage before the concrete was poured. He innovated the use of movable safety netting beneath the construction site, which saved the lives of many otherwise-unprotected steelworkers. Of eleven men killed from falls during construction, ten were killed (when the bridge was near completion) when the net failed under the stress of a scaffold that had fallen. Nineteen others who were saved by the net over the course of construction became proud members of the (informal) Half Way to Hell Club.

During the bridge work, the Assistant Civil Engineer of California Alfred Finnila had overseen the entire ironing work of the bridge as well as half of the bridge's road work. With the death of Jack Balestreri in April 2012, all workers involved in the original construction are now deceased.

Structure

The weight of the roadway is hung from two cables that pass through the two main towers and are fixed in concrete at each end. Each cable is made of 27,572 strands of wire. There are 80,000 miles (129,000 km) of wire in the main cables. The bridge has approximately 1,200,000 total rivets.

Traffic

The bridge is part of the National Highway System, not U.S. Highway 101 or State Route 1, contrary to popular belief. The median markers between the lanes are movedto conform to traffic patterns. On weekday mornings, traffic flows mostly southbound into the city, so four of the six lanes run southbound. Conversely, on weekday afternoons, four lanes run northbound. During off-peak periods and weekends, traffic is split with three lanes in each direction, or three and two lanes with one buffer lane.

Aesthetics

The color of the bridge is officially an orange vermillion called international orange. The color was selected by consulting architect Irving Morrow because it complements the natural surroundings and enhances the bridge's visibility in fog. Aesthetics was the foremost reason why the first design of Joseph Strauss was rejected. Upon re-submission of his bridge construction plan, he added details, such as lighting, to outline the bridge's cables and towers. In 1999, it was ranked fifth on the List of America's Favorite Architecture by the American Institute of Architect.

As a prominent American landmark, the Golden Gate Bridge has been used in numerous media, including books, films and video games.

The Golden Gate is featured prominently in the opening sequences of at least two sitcoms; beginning in season two (1969–1970) of the 1968–1973 CBS series The Doris Day Show. In this scene, character Doris Martin is driving a 1969 Plymouth Barracuda convertible across the bridge; and the 1987–1995 ABC series Full House, the Golden Gate Bridge is featured in the title card, and was also featured in the title card for Seasons 2 - 8 of the USA Network series Monk (TV Series). The bridge is also featured in the video game Call of Duty: Black Ops II as a playable area in the downloadable Zombies map "Mob of the Dead."

Source From : http://en.wikipedia.org/wiki/Golden_Gate_Bridge

EMPIRE STATE BUILDING

The Empire State Building is a 102-story skyscraper located in Midtown Manhattan, New York City, at the intersection of Fifth Avenue and West 34th Street. It has a roof height of 1,250 feet (381 meters), and with its antenna spire included, it stands a total of 1,454 ft (443.2 m) high. Its name is derived from the nickname for New York, the Empire State. It stood as the world's tallest building for 40 years, from its completion in 1931 until construction of the World Trade Center's North Tower was completed in 1972. Following the September 11 attacks in 2001, the Empire State Building was again the tallest building in New York (although it was no longer the tallest in the US or the world), until One World Trade Center reached a greater height on April 30, 2012. The Empire State Building is currently the third-tallest completed skyscraper in the United States (after the Willis Tower and Trump International Hotel and Tower, both in Chicago), and the 23rd-tallest in the world (the tallest now is Burj Khalifa, located in Dubai). It is also the fourth-tallest freestanding structure in the Americas.

The construction was part of an intense competition in New York for the title of "world's tallest building". Two other projects fighting for the title, 40 Wall Street and the Chrysler Building, were still under construction when work began on the Empire State Building. Each held the title for less than a year, as the Empire State Building surpassed them upon its completion, just 410 days after construction commenced. Instead of taking 18 months as anticipated, the construction took just under fifteen. The building was officially opened on May 1, 1931 in dramatic fashion, when United States President Herbert Hoover turned on the building's lights with the push of a button from Washington, D.C. Coincidentally, the first use of tower lights atop the Empire State Building, the following year, was for the purpose of signaling the victory of Franklin D. Roosevelt over Hoover in the presidential election of November 1932.

The Empire State Building remained the tallest man-made structure in the world for 23 years before it was surpassed by the Griffin Television Tower Oklahoma (KWTV Mast) in 1954. It was also the tallest free-standing structure in the world for 36 years before it was surpassed by the Ostankino Tower in 1967.

The longest world record held by the Empire State Building was for the tallest skyscraper (to structural height), which it held for 42 years until it was surpassed by the North Tower of the World Trade Center in 1972. An early-1970s proposal to dismantle the spire and replace it with an additional 11 floors, which would have brought the building's height to 1,494 feet (455 m) and made it once again the world's tallest at the time, was considered but ultimately rejected.

With the destruction of the World Trade Center in the September 11 attacks, the Empire State Building again became the tallest building in New York City, and the second-tallest building in the Americas, surpassed only by the Willis Tower in Chicago. It is currently the fourth-tallest, surpassed by the Willis Tower, the Trump International Hotel and Tower (Chicago) and the One World Trade Center. One World Trade Center, currently under construction, surpassed the roof height of the Empire State Building on April 30, 2012, and became the tallest building in New York City—on the way toward becoming the tallest building in the Americas at a planned 1,776 feet (541 m).

When measured by pinnacle height, the Empire State Building is the third-tallest building in the USA, surpassed by the Willis Tower and Chicago's John Hancock Center. On clear days, the building can be seen from much of the New York Metropolitan Area, as far away as New Haven, Connecticut; Morristown, New Jersey; and from the roller coasters at Six Flags Great Adventure in Jackson Township, New Jersey, specifically Kingda Ka.

1945 plane crash

At 9:40 a.m.on Saturday, July 28, 1945, a B-25 Mitchell bomber, piloted in thick fog by Lieutenant Colonel William Franklin Smith, Jr., crashed into the north side of the Empire State Building, between the 79th and 80th floors, where the offices of the National Catholic Welfare Council were located. One engine shot through the side opposite the impact and flew as far as the next block, where it landed on the roof of a nearby building, starting a fire that destroyed a penthouse. The other engine and part of the landing gear plummeted down an elevator shaft. The resulting fire was extinguished in 40 minutes. 14 people were killed in the accident. Elevator operator Betty Lou Oliver survived a plunge of 75 stories inside an elevator, which still stands as the Guinness World Record for the longest survived elevator fall recorded. Despite the damage and loss of life, the building was open for business on many floors on the following Monday. The crash helped spur the passage of the long-pending Federal Tort Claims Act of 1946, as well as the insertion of retroactive provisions into the law, allowing people to sue the government for the accident. Main article: B-25 Empire State Building crash

A year later, another aircraft narrowly missed striking the building.

Source From : http://en.wikipedia.org/wiki/Empire_State_Building

CN TOWER

The CN Tower (French: Tour CN) is a 553.33 m-high (1,815.4 ft) concrete communications and observation tower in Downtown Toronto, Ontario, Canada. Built on the former Railway Lands, it was completed in 1976, becoming the world's tallest free-standing structure and world's tallest tower at the time. It held both records for 34 years until the completion of Burj Khalifa and Canton Tower in 2010. It remains the tallest free-standing structure in the Western Hemisphere, a signature icon of Toronto's skyline, and a symbol of Canada, attracting more than two million international visitors annually.

Construction on the CN Tower began on February 6, 1973 with massive excavations at the tower base for the foundation. By the time the foundation was complete, 56,000 t (61,729 short tons; 55,116 long tons) of earth and shale were removed to a depth of 15 m (49.2 ft) in the centre, and a base incorporating 7,000 m³ (9,156 cu yd) of concrete with 450 t (496 short tons; 443 long tons) of rebar and 36 t (40 short tons; 35 long tons) of steel cable had been built to a thickness of 6.7 m (22.0 ft). This portion of the construction was fairly rapid, with only four months needed between the start and the foundation being ready for construction on top.
In August 1974, construction of the main level commenced. Using 45 hydraulic jacks attached to cables strung from a temporary steel crown anchored to the top of the tower, twelve giant steel and wooden bracket forms were slowly raised, ultimately taking about a week to crawl up to their final position. These forms were used to create the brackets that support the main level, as well as a base for the construction of the main level itself. The Space Deck (currently named SkyPod) was built of concrete poured into a wooden frame attached to rebar at the lower level deck, and then reinforced with a large steel compression band around the outside.

The main deck level is seven storeys, some of which are open to the public. Below the public areas — at 338 m (1,108.9 ft) — is a large white donut-shaped radomecontaining the structure's microwave receivers. The glass floor and outdoor observation deck are at 342 metres (1,122.0 ft). The glass floor has an area of 24 m² (258 sq ft) and can withstand a pressure of 4,100kilopascals (595 psi). The floor's thermal glass units are 64 mm (2.5 in) thick, consisting of a pane of 25-millimetre (1.0 in) laminated glass, 25 mm (1.0 in) airspace and a pane of 13 mm (0.5 in) laminated glass. Some people experience acrophobia when standing on the glass floor and looking down at the ground 342 m (1,122.0 ft) below. In 2008, one elevator was upgraded to add a glass floor panel, believed to have the highest vertical rise of any elevator equipped with this feature. The Horizons Cafe and the lookout level are at 346 metres (1,135.2 ft). The 360 Restaurant, a revolving restaurant that completes a full rotation once every 72 minutes, is at 351 m (1,151.6 ft). When the tower first opened, it also featured a disco named Sparkles, billed as the highest disco and dance floor in the world.

EdgeWalk

On August 1, 2011, the CN Tower opened the EdgeWalk, an amusement in which thrill-seekers can walk on and around the roof of the main pod of the tower at 356 m (1,168.0 ft), which is directly above the 360 Restaurant. It is the world's highest full-circle, hands-free walk. Visitors are tethered to an overhead rail system and walk around the edge of the CN Tower's main pod above the 360 Restaurant on a 1.5 m (4.9 ft) metal floor. The attraction is closed throughout the winter season and during periods of electrical storms and high winds.

Source From : http://en.wikipedia.org/wiki/CN_Tower