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  Encyclopedia of Keywords > Matter > Liquids > Water > Rivers > Dams   Michael Charnine

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    This Review contains major "Dams"- related terms, short phrases and links grouped together in the form of Encyclopedia article.


  1. Dams are harming the environment that people live in. (Web site)
  2. Dams are among the oldest structures built by humans for collective use. (Web site)
  3. Dams are of two general types. (Web site)
  4. Dams are classified as either storage, diversion or detention.
  5. Dams are built to create reservoirs that capture water from streams and store the water in reservoirs. (Web site)


  1. Weaning kids from their dams is a stress-inducing experience for both mothers and kids. (Web site)
  2. Let-s examine principal functions of dams. (Web site)

Large Dams

  1. The global debate about large dams is at once overwhelmingly complex and fundamentally simple.
  2. But the last 50 years have also highlighted the performance and the social and environmental impacts of large dams.
  3. Indeed, from the 1930s to the 1970s the construction of large dams became - in the eyes of many - synonymous with development and economic progress.


  1. Another emergency solution to ice dams is to fill a sock or nylon with calcium chloride. (Web site)
  2. Increasingly, fill dams also include geotextiles and geomembranes. (Web site)

Ice Dams

  1. But ice dams can occur even in properly detailed roof assemblies from differential solar snow melt. (Web site)
  2. Ice dams occur when snow melts near the ridge lines of warm roofs (roofs without adequate ventilation).
  3. To stop dammed up water from leaking under the shingles use a waterproof membrane under the parts of the roof where ice dams occur and melt water backs up. (Web site)


  1. The best prevention to ice dams is a well-ventilated (cool) roof. (Web site)
  2. However, new ice dams can form above the cables and still cause extensive damage. (Web site)
  3. Temporary prevention of ice dams can also be done through the use of electric cables along the eaves of the roof (where the dams usually form). (Web site)
  4. Mechanical attic ventilation IS NOT a recommended solution to ice dams in Minnesota.
  5. A. In my opinion, adding heating cables to the eave edges of a house in order to try and prevent damage from ice dams is a last resort.


  1. There is great controversy surrounding the Snake River Dams.
  2. Dams change the chemical, physical, and biological processes of river ecosystems. (Web site)


  1. Very few timber dams are still in use.
  2. Two common variations of timber dams were the crib and the plank. (Web site)


  1. Rolled-earth dams may also employ a watertight facing or core in the manner of a rock-fill dam. (Web site)
  2. Rock -fill dams are embankments of loose rock with either a watertight upstream face of concrete slabs or timber or a watertight core.


  1. Rock -fill dams are embankments of compacted free-draining granular earth with an impervious zone. (Web site)
  2. Like the earth embankment, rock-fill dams resist damage from earthquakes quite well.
  3. Embankment dams are made from compacted earth, and have two main types, rock-fill and earth-fill dams. (Web site)
  4. Based on structure and material used, dams are classified as timber dams, embankment dams or masonry dams, with several subtypes. (Web site)
  5. But embankment dams are also armed with a dense, waterproof core that prevents water from seeping through the structure. (Web site)


  1. In other situations, large ice dams and icicles can form. (Web site)
  2. It summarises the lessons learned from our Global Review of experience with large dams.
  3. According to the International Commission on Large Dams (ICOLD), a large dam is 15 m or more high (from the foundation).
  4. We also need to revisit the definition of large dams: you can't call a 10-meter dam large when you have 190-meter dams. (Web site)
  5. Using this definition, there are more than 45,000 large dams around the world, almost half of them in China. (Web site)


  1. And we believe we have shifted the centre of gravity in the dams debate to one focused on options assessment and participatory decision-making.
  2. In some cases, the opportunity for corruption provided by dams as large-scale infrastructure projects further distorted decision-making.


  1. Masonry dams are of either the gravity or the arch type.
  2. Tailings dams -- large structures that hold back mining waste -- are a type of embankment dam. (Web site)

Gravity Dams

  1. Embankment dams rely on their weight to hold back the force of water, like the gravity dams made from concrete. (Web site)
  2. Gravity dams can only be built on a solid rock foundation.
  3. Gravity dams use the downward force of the weight of the construction materials to resist the horizontal force of the water.


  1. The number of large dams is well known - the Army Corps of Engineers keeps a data base. (Web site)
  2. Early civil engineers began to study Sir Isaac Newton's physics and other scientific theories and apply them to practical structures including dams. (Web site)


  1. Two types of single-arch dams are in use, namely the constant-angle and the constant-radius dam. (Web site)
  2. The multiple-arch dam consists of a number of single-arch dams with concrete buttresses as the supporting abutments. (Web site)


  1. The key decisions are not about dams as such, but about options for water and energy development.
  2. Where other options offer better solutions, they should be favoured over large dams.


  1. The WCD report is a milestone in the evolution of dams as a development option.
  2. The Commission's report identifies the key elements of the debate on water and energy resources management and the role of dams in this debate. (Web site)


  1. Dams affect many ecological aspects of a river. (Web site)
  2. Sneak a peek at the forces that affect arch dams.


  1. Dams may be built to provide water for irrigation or town water supply, control the amount of water in rivers or to provide hydroelectric power.
  2. Serious conflicts are simmering between neighbouring countries because dams have turned off the water supply for downstream states. (Web site)
  3. California's Central Valley, site of one of the most important Bureau of Reclamation projects, is more dependent on ground water than on the federal dams.
  4. Government projects such as airports, highways, water and sewer systems, streets, bridges and dams are the, responsibility of public works inspectors.


  1. The nature and magnitude of the impacts of dams on affected communities and on the environment have now become established as key issues in the debate.
  2. The hindering effects of dams on humans and their environment heavily outweigh the beneficial ones.


  1. The World Commission on Dams was born from this debate.
  2. By the year 2000 the world had built more than 45 000 large dams.

Dams Built

  1. Dams may also be built to control effluent from industrial work sites such as miness or factories.
  2. All dams built have an excellent performance record. (Web site)
  3. The debate is partly about what occurred in the past and continues to occur today, and partly about what may unfold in the future if more dams are built.


  1. Dams provide a unique arena for understanding the complex choices facing societies in meeting their water and energy needs.
  2. Thus the debate around dams challenges views of how societies develop and manage water resources in the broader context of development choices.

Were Built

  1. Some of these dams no longer serve the original purpose for which they were built.
  2. Gothic style dams were built to contain the waters of Howden Reservoir (1912) and Derwent Reservoir (1916).


  1. Most governments exercise statutory control of engineers qualified to design and inspect dams.
  2. By 1950, governments, or in some countries the private sector, were building increasing numbers of dams as populations increased and national economies grew.


  1. The actual project consisted of the construction of five dams, as well as levee and channel improvements of nine villages and towns.
  2. DAMS VS. LEVEES: A dam is a wall built across a waterway, such as a river, that controls the flow of water along its natural path.


  1. As specific interventions for diverting water, dams require constructive co-operation.
  2. Dams can be formed by human agency, natural causes, or by the intervention of wildlife such as beavers. (Web site)

United States

  1. Hydroelectric dams provide 13% of the total power generation in the United States which prevents over 200 million tons of carbon dioxide emissions. (Web site)
  2. Most dams in the United States were built to serve important social purposes.


  1. The debate about dams is a debate about the very meaning, purpose and pathways for achieving development.
  2. Most dams incorporate mechanisms to permit the reservoir to be lowered or even drained in the event of such problems. (Web site)
  3. Timber dams were widely used in the early part of the industrial revolution and in frontier areas due to ease and speed of construction. (Web site)
  4. All fill dams depend on weight to remain stable. (Web site)
  5. This overview document provides a highly condensed summary of Dams and Development.


  1. Matter > Liquids > Water > Rivers
  2. Nature > Matter > Liquids > Water
  3. Encyclopedia of Keywords > Places > Earth > Geology
  4. Society > Culture > Architecture > Construction
  5. Encyclopedia of Keywords > Society > Economics > Development


Weirs (1)
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Tarbela Dam
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  Short phrases about "Dams"
  Originally created: September 16, 2007.
  Links checked: June 18, 2013.
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