Saturday, July 02, 2005

How is the way to build a Dam ?

With the exception of the Great Wall of China, dams are the largest structures ever built. Throughout history, big dams have prevented flooding, irrigated farmland, and generated tremendous amounts of electricity. Without dams, modern life as we know it would simply not be the same.

Since the first large-scale dam was built in Egypt more than 5,000 years ago, engineers have devised various types of dams to withstand the forces of a raging river.

El Atazar Dam
Arch dam:
El Atazar Dam
Arch Dams...
are good for narrow, rocky locations. They are curved, and the natural shape of the arch holds back the water in the reservoir. Arch dams, like the El Atazar Dam in Spain, are thin and require less material than any other type of dam.

How does the force work in the arch dam ?

Arch Dam: Forces
The arch squeezes together as the water pushes against it. The weight of the dam also pushes the structure down into the ground.

Image of the Bartlett Dam
Buttress dam:
Bartlett Dam
Buttress Dams...
may be flat or curved, but one thing is certain: a series of supports, or buttresses, brace the dam on the downstream side. Most buttress dams, like the Bartlett Dam in Arizona, are made of reinforced concrete.

How does the force work in buttresses dam?

Buttress Dam: Forces
Water pushes against the buttress dam, but the buttresses push back and prevent the dam from toppling over. The weight of the buttress dam also pushes down into the ground.

Image of an embankment dam
Embankment dam:
New Waddell Dam
Embankment Dams...

are the most commonly built dams in the United States. They are massive dams made of earth and rock. Like gravity dams, embankment dams rely on their heavy weight to resist the force of the water. But embankment dams are also armed with a dense, waterproof core that prevents water from seeping through the structure. Tailings dams -- large structures that hold back mining waste -- are a type of embankment dam.

How does the force work in the Embankment Dam?

Embankment Dam: Forces
Water pushes against the embankment dam, but the heavy weight of the dam pushes down into the ground and prevents the structure from falling over.

Grand Coulee Dam
Gravity dam:
Grand Coulee Dam
Gravity Dams...
are massive dams that resist the thrust of water entirely by their own weight. Most gravity dams, like the Grand Coulee Dam in Washington, are expensive to build because they require so much concrete. Still, many people prefer its solid appearance to the thinner arch and buttress dams.

How does the force work in gravity dam?

Gravity Dam: Forces
Water pushes against the gravity dam, but the heavy weight of the dam pushes down into the ground and prevents the structure from falling over.

All dams -- whether they're embankment, buttress, arch, or gravity -- must be maintained as they get older. Without proper maintenance, spillways can clog and concrete can crack. Some dams are even removed because they block the migration of fish.

When should dams be taken down? When should they be repaired? Engineers must consider the services that each dam provides and the environmental impact that each dam creates before they make this decision -- and this isn't easy. Oftentimes, there is no right answer.

Sources: Building Big/


Anonymous Jenny said...

this is a really interesting article, the diagrams are great too! please update the blog soon!

3:57 pm  
Anonymous online marketing said...

really good post

2:50 pm  
Anonymous shiny diamante necklaces said...

i love the diagrams, its a great way to help people understand. please update soon!

11:03 am  
Anonymous Anonymous said...

Now is a great time to trade currencies with the world economic problems. People are cashing in by trading forex right now, the world money sistuation is a mess so why not make profit off it? Keep your money offshore where it is safe!

A good Forex broker is 1pipfix, 1pip spreads and the best top rated of forex brokers with metatrader 4

1pipfix is a partner broker of

1:00 am  
Anonymous Anonymous said...

Best Forex Brokers stp ndd ecn
free metatrader demo, the top forex broker is 4runnerforex tight low spreads.

10:15 pm  
Anonymous Anonymous said...

what are we doing? We think that by telling them these things they will learn them and voila[url=]Women's Roddy White Jersey[/url]
out comes your perfect child Assess the level of power[url=]Clay Matthews Packers Jersey[/url]
authority and control of those who minister[url=]Blue Russell Wilson Jersey[/url]
the level of vulnerability of those being ministered to[url=]Ben Roethlisberger Elite Jersey[/url]
and the risk that harm could be committed by sexual harassment[url=]Marshawn Lynch GreyJersey[/url]
exploitation[url=]Redskins Pierre Garcon Jersey[/url]
assault[url=]NFL Julio Jones Jersey[/url]
emotional[url=]Russell Wilson Women's Jersey[/url]
verbal[url=]Peyton Manning Kids Jersey[/url]
physical[url=]Reggie Wayne Authentic Jersey[/url]
spiritual or financial abuse1
Any company that introduces a new product will hire people to try it out before it is introduced to the market How much are you worth?Science And The Bible Don't Agree: When most of the world was afraid to sail too far out on the ocean for fear of falling off the edge of the world[url=]Victor Cruz Kids Jersey[/url]
the Bible clearly indicated that the world was round What You Can Do ? Do everything possible to make sure all of management is on-board with the training and its purpose

1:00 am  
Anonymous Anonymous said...

top [url=]online casino[/url] brake the latest [url=]free casino[/url] unshackled no consign perk at the leading [url=]casino

7:15 am  
Anonymous Anonymous said...

top [url=]uk casino online[/url] hinder the latest [url=]casino games[/url] manumitted no consign bonus at the chief [url=]online casino

12:04 pm  
Anonymous Anonymous said...

Did you [url=]blackjack[/url] respect that you can do Volute Castle without impede from your mobile? We detain a appellation portable casino helpful an lustfulness to iPhone, iPad, Android, Blackberry, Windows 7 and Smartphone users. Assign your gaming with you and be a combatant [url=]anal toys[/url] wherever you go.

7:14 am  

Post a Comment

<< Home