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Manoj
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What is Dam ? Empty What is Dam ?

on Wed Jan 16, 2019 10:55 am
hi
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meenu007
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on Wed Jan 16, 2019 11:01 am
Once the public caught wind of the plans to build a dam in Nevada’s Black Canyon, surrounding cities appreciated the potential economic windfall of hosting such an undertaking. Las Vegas became especially eager to house the project’s headquarters, even going so far as to sacrifice its “party city” reputation to appear worthy of the honor.
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meenu007
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on Wed Jan 16, 2019 11:02 am
When Secretary of the Interior Ray Lyman Wilbur, a major player in the project, came to town for a 1929 visit, local authorities in Las Vegas shut down a slew of its speakeasies and brothels for the day in an attempt to seem classier.
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meenu007
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on Wed Jan 16, 2019 11:02 am
Sin City’s efforts were ultimately futile, and a planned community went up to house the 5000-man workforce. Miles of street were paved and railroad tracks were laid to connect the canyon-side village to the project site and neighboring Las Vegas.
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meenu007
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on Wed Jan 16, 2019 11:02 am
The community, known as Boulder City, is still standing. However, delays in its development forced a good number of early workers to reside in the nearby Ragtown, which lived up to its name with extremely humble living conditions.
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meenu007
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on Wed Jan 16, 2019 11:02 am
The Bureau of Reclamation, the department subsidizing the project, supplied a whopping 3.25 million cubic yards of concrete for the dam itself, plus another 1.11 million cubic yards for the power plant and additional facilities. This quantity of concrete would be enough to build 3000 miles of road—a full-sized highway from one end of the United States to the other.
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Abhishek
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What is Dam ? Empty Re: What is Dam ?

on Wed Jan 16, 2019 11:02 am
Dams are massive barriers built across rivers and streams to confine and utilize the flow of water for human purposes such as irrigation and generation of hydroelectricity. This confinement of water creates lakes or reservoirs.
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Abhishek
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on Wed Jan 16, 2019 11:02 am
The first known dam was built in 2900 B.C. across the Nile River to protect the city of Memphis from flooding. Dam build was continued into the time of the Roman empire, after which dam construction was literally lost until the 1800s.
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meenu007
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on Wed Jan 16, 2019 11:02 am
Additionally, the dam required about five million barrels of cement, nearly equaling the total quantity of cement utilized by the Bureau in its previous 27 years of existence.
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Abhishek
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What is Dam ? Empty Re: What is Dam ?

on Wed Jan 16, 2019 11:03 am
Dams are a structure also seen in nature - beavers build dams to keep the water deep enough to cover the openings to their homes, protecting them from predators.
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meenu007
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on Wed Jan 16, 2019 11:03 am
as you might guess, all this concrete posed some challenges. Without engineers’ intervention, it would have taken the massive blocks of poured concrete years to cool, and this gradual drying would have left the pieces susceptible to breaking.
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Abhishek
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on Wed Jan 16, 2019 11:03 am
irrigation. These are often diversion dams, which stop a rivers natural course so that water can be sent off to a different place.
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meenu007
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on Wed Jan 16, 2019 11:03 am
To speed up the process, an engineering team designed a mammoth refrigeration machine. The supersized fridge dispensed upwards of a thousand tons of ice every day, speeding up the cooling and lopping decades off the project’s timeline.
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Abhishek
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What is Dam ? Empty Re: What is Dam ?

on Wed Jan 16, 2019 11:03 am
control flooding. These are called detention dams, which are constructed to either stop or slow the amount of water in a river.
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meenu007
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What is Dam ? Empty Re: What is Dam ?

on Wed Jan 16, 2019 11:03 am
The giant fridge had its work cut out for it. Work on the Hoover Dam kicked off in April 1931, not long before Nevada’s Clark County would weather some of its hottest temperatures on record. The month of June delivered an average daily high of 119 degrees Fahrenheit, prompting a wave of heatstroke among workers.

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Abhishek
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on Wed Jan 16, 2019 11:03 am
According to Patrick McCully, campaigns director of the International Rivers Network, over 800,000 dams have been constructed worldwide for drinking water, flood control, hydropower, irrigation, navigation, and water storage.
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deepika2029
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on Wed Jan 16, 2019 11:03 am
About 50,000 dams with a height of 15 meters or more and millions of smaller dams have been built on the world’s rivers. Some of them date back centuries, but most were built after World War II. About 5,000 dams have a height of 60 meters or more; another 350 such giants are currently under construction.

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Abhishek
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on Wed Jan 16, 2019 11:03 am
But since the 1950s, the peak of the big dam era, perceptions of dams and dam building have changed.
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deepika2029
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on Wed Jan 16, 2019 11:03 am
Dams have fragmented two thirds of the world’s large rivers and flooded a land area the size of California. Their reservoirs contain three times as much water as all the world’s rivers, and constantly lose close to four Niagara Falls to evaporation. Dams trap 40 cubic kilometers of sediments every year, and starve deltas of the silt that protects them against the intruding sea.

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Abhishek
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on Wed Jan 16, 2019 11:04 am
Once symbols of development, dams today symbolize, as shown in this website, not progress but environmental and social devastation.
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kunal
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What is Dam ? Empty Re: What is Dam ?

on Wed Jan 16, 2019 11:04 am
am may be defined as a solid barrier constructed at a suitable location across a river valley with a view of impounding water flowing through that river.
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deepika2029
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on Wed Jan 16, 2019 11:04 am
Dams generate 16% of the world’s electricity and irrigate food crops for 12-15% of the world’s population. To a lesser extent, dams have also been built for water supply, flood protection, navigation and tourism purposes. Most dams have been built for irrigation, but 80% of the water they store is used for hydropower.
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kunal
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on Wed Jan 16, 2019 11:04 am
Additional benefits coming from dams are development of fisheries and recreation facilities in the reservoirs created by them and also the overall greenery effect all along the reservoirs.
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deepika2029
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on Wed Jan 16, 2019 11:04 am
Dams block the migration of fish, deplete rivers of oxygen, and interfere with the biological triggers that guide fish. They also reduce the ability of rivers to clean themselves. Due to dam building and other factors, the population of freshwater species declined by 37% between 1970-2008 - more than the populations of any other ecosystems. Tropical freshwater populations declined by a stunning 70%.

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kunal
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on Wed Jan 16, 2019 11:04 am
In a country like India where rainfall is erratic and depends considerably on the vagaries of seasonal winds – the monsoons, importance of dams can hardly be overemphasized. Hundreds of thousands kilometer long irrigational canals being fed by reservoirs created by around four thousand minor and major dams spread throughout the country have been responsible, to a great extent, for making India self-sufficient in food production.

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