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Arch-gravity Hoover Dam Architectural Plans

An arch-gravity dam or arched dam is a dam with the characteristics of both an arch dam and a gravity dam. It is a dam that curves upstream in a narrowing curve that directs most of the water against the canyon rock walls, providing the force to compress the dam. It combines the strengths of two common dam forms and is considered a compromise between the two. They are made of conventional concrete, Roller Compacted Concrete (RCC), or masonry. Arch-gravity dams are not reinforced except at the spillway. A typical example of the conventional concrete dam is the Hoover Dam. Changuinola Dam is an example of the RCC arch-gravity dam. A gravity dam requires a large volume of internal fill.[1] An arch-gravity dam can be thinner than the pure gravity dam and requires less internal fill.[2]

Overview[edit]

Hoover Dam from the air

Arch-gravity dams are massive dams of concrete that resist the thrust of water by their weight using the force of gravity and the arch action.[3]

An arch-gravity dam incorporates the arch's curved design that is so effective in deflecting the water in narrow, rocky locations where the gorge's side are of hard rock and the water is forced into a narrow channel. Therefore, the span needed for the dam is narrow; the dam's curved design effectively holds back the water in the reservoir using a lesser amount of construction material.[4]

When properly situated on an appropriate site, the arch-gravity dam, combining the load resisting qualities of both a gravity dam and an arch dam, inspires the most public confidence because of its appearance of massive permanence.[5] However, curving a gravity dam may make it look stronger, but some of this effect may be psychological factors in operation in making a choice of dam style.[6]

Gravity dam[edit]

Gravity dam - Dworshak Dam

The gravity dam is a massive concrete or earth type structure. Gravity dams use their own weight to resist opposing forces.[4] They rely on their great weight and size for stability.[7] The gravity dam is the most commonly built dam in the world. One of the reasons for this is the simplicity of design. Unfortunately it requires great quantities of material to construct.[8]

Arch dam[edit]

Mratinje Dam in Montenegro

An arch dam is a thin, curved concrete structure, with the concave side of the curve downstream. Therefore, the force of the water against the canyon wall squeezes the arch, compressing and strengthening its structure and pushing it into the ground.[9] An arch dam is a good dam type for a narrow gorge in a mountainous area with steep walls of rock.[10] However, the bedrock in the foundation and abutments must be sound to withstand the pressure of the water.[11]

Arch dams with more than one contiguous arch or plane are described as multiple arch dams. A dam that is curved in both its horizontal and vertical planes is called a double-curvature arch dam.[11]

See also[edit]

Footnotes[edit]

  1. ^ Luis E. Plaza (1998). Dam Safety: Proceedings of the International Symposium on New Trends. Taylor and Francis. p. 425. ISBN 90-5410-974-2. 
  2. ^ "Arch Gravity dam". U.S. Bureau of Reclamation. Archived from the original on 25 December 2007. Retrieved 2007-12-27. 
  3. ^ "Glossary onf Engineering Words - Gravity dam". pbs.org. Archived from the original on 30 December 2007. Retrieved 2007-12-28. 
  4. ^ a b "Dam Basics". pbs.org. Archived from the original on 3 December 2007. Retrieved 2007-12-27. 
  5. ^ "Dams - Types and Considerations". quest.arc.nasa.gov. Retrieved 2007-12-29. 
  6. ^ Donald C. Jackson (1988). Great American Bridges and Dams. Wiley.com. p. 48. ISBN 978-0-471-14385-7. Retrieved 2007-12-29. 
  7. ^ "Glossary - Gravity Dam". US Bureau of the Interior. Archived from the original on 25 December 2007. Retrieved 2007-12-28. 
  8. ^ "Gravity Dam - Characteristics". University of California - Davis. Retrieved 2007-12-29. 
  9. ^ "Managing Water - Glossary". US Bureau of the Interior. Archived from the original on 25 December 2007. Retrieved 2007-12-28. 
  10. ^ "Arch Dam Forces". Archived from the original on 5 February 2007. Retrieved 2007-02-05. 
  11. ^ a b "Introduction to Arch Dams". Archived from the original on 5 February 2007. Retrieved 2007-02-05. 

Original courtesy of Wikipedia: http://en.wikipedia.org/wiki/Arch-gravity_dam — Please support Wikipedia.
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2223 videos foundNext > 

Arch-Gravity Dam during Heavy Flooding

A concrete arch-gravity dam with the floodgates open during heavy flooding. I wouldn't fancy driving over this ! :)

Hoover Dam | US Boulder Dam | World Documentary TV

Hoover Dam | US Boulder Dam | World Documentary TV. Hoover Dam, once known as Boulder Dam, is a concrete arch-gravity dam in the Black Canyon of the ...

The Construction of Hoover Dam | One of the Largest Dam of the World | Documentary Film

My channel: http://youtube.com/TheBestFilmArchives ▻SUBSCRIBE: http://www.youtube.com/TheBestFilmArchives?sub_confirmation=1 ▻Google+: ...

The building of the Boulder dam (Hoover dam) - 1930's documentary - WDTVLIVE42

Boulder Dam is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the US states of Arizona and Nevada.

N2762P the one for the tours at HOOVER DAM

Hoover Dam, once known as Boulder Dam, is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of ...

Dam Opening its Floodgates

A concrete arch-gravity dam opening all six of its main spillway floodgates. Very impressive.

Dam Construction Film - 3D Animation by Graffiti Design & Advertising

Dam Construction 3D Animation Film Client - AFCONS Infrastructure Limited Duration - 8 Min 20 Sec Created by Graffiti Design & Advertising, INDIA.

MegaStructures Hoover Dam documentary in english Part 1

Hoover Dam, once known as Boulder Dam, is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the US states of ...

Bob Mould 'Hoover Dam' Live

Hoover Dam, once known as Boulder Dam, is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of ...

Hoover Dam spillway (Arizona and Nevada)

Hoover Dam (formerly known as Boulder Dam) is protected against over-topping by two spillways located behind each dam abutment, running roughly parallel ...

2223 videos foundNext > 

39 news items

BDlive

BDlive
Tue, 19 Jan 2016 19:50:30 -0800

... the construction of a vast concrete barrier that completely hid our southerly neighbours; soon our earth dam was destroyed, its earth barrier flattened; and sooner still it was the rain season and the biggest concrete arch-gravity dam in the entire ...

AOL News

AOL News
Tue, 29 Sep 2015 16:19:23 -0700

This April 13, 2014 view shows Hoover Dam, a concrete arch-gravity dam in the Black Canyon of the Colorado River on the border between the US states of Arizona and Nevada. Hoover Dam ,finished in 1936, impounds Lake Mead, the largest reservoir in the ...

Mashable

Mashable
Fri, 11 Sep 2015 04:03:45 -0700

With the riverbed dry, excavation began. Millions of tons of loose sediment and rocks were scraped away to reveal bedrock. The design called for an arch-gravity dam, which would transfer the crushing force of the water reservoir to the abutting canyon ...

WDRB

WDRB
Fri, 18 Sep 2015 03:52:30 -0700

Once known as Boulder Dam, Hoover Dam is a concrete arch-gravity dam across the Black Canyon of the Colorado River between the states of Arizona and Nevada. Located a short drive southeast of Las Vegas, Hoover Dam is a popular tourist destination ...

Yahoo Travel

Yahoo Travel
Thu, 24 Sep 2015 17:49:37 -0700

America is awash with iconic and storied landmarks and man-made monuments that both symbolize the country's colorful history and provide inspiration to the millions that flock to see them each year. From the Grand Canyon to the Empire State Building ...

azcentral.com

azcentral.com
Sat, 09 May 2015 07:50:00 -0700

Hoover Dam: The concrete arch-gravity dam in the Black Canyon of the Colorado River between Arizona and Nevada was constructed between 1931 and 1936. According to the U.S. Bureau of Reclamation, 96 men died during the five-year project. The dam ...

Chron.com

Chron.com
Thu, 30 Jul 2015 14:14:57 -0700

With Lake Mead at less than half its capacity, remnants of a Nevada ghost town are reemerging. St. Thomas, a Mormon settlement that was once a thriving stop between Los Angeles and Salt Lake City, was abandoned in 1938. The town along U.S. 91 was ...

Huffington Post

Huffington Post
Tue, 07 Jul 2015 11:30:54 -0700

Construction of the Hoover Dam began on July 7, 1930, marking the beginning of the creation of one of the largest manmade structures in the world. According to History.com, it took five years to build the dam, which generates enough energy each year to ...
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