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The arch dam uses the concrete as its strength by being weighed down from the pressure of water. Concrete isn’t strong when it’s being stretched or pulled, but is very strong in compression. The design of the dam will depend on the purpose and site.

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Concrete dams are gravity dams usually built in large blocks divided by joints to make the construction more convenient and reduce thermal stress. The joints are grouted after the dam is cooled. Transverse joints are perpendicular to the dam axis.

Overflow dam is a dam which allows the water over its crest when surplus water is flowing on the upstream side. This is also called as spillway dam or over fall dam.

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earthfill dam, also called earth dam or embankment dam, dam built up by compacting successive layers of earth, using the most impervious materials to form a core and placing more permeable substances on the upstream and downstream sides.

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Hoover Dam is a concrete arch-gravity dam in the Black Canyon of the Colorado River, on the border between the U.S. states of Nevada and Arizona. It was constructed between 1931 and 1936 during the Great Depression and was dedicated on September 30, 1935, by President Franklin D.

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A dam is a man made barrier usually built across a river to hold back water and forming a lake, or reservoir, behind it.

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1) Further down the Yangtze River in China lives the most powerful dam in the world: The Three Gorges Dam, which spans 1.45 miles and is 594 feet tall.

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As explained, the dams will bring more problems than they will solve. Hydropower dams flood large areas, force people to relocate, threaten freshwater biodiversity, disrupt subsistence fisheries, and leave rivers dry ” substantially affecting the ecosystem.

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Through its large impact on the delivery of riverine OC, river damming represents a major anthropogenic forcing on the trophic state and C balance of the coastal ocean. By modifying C cycling and the accompanying greenhouse gas exchanges along the land-to-ocean continuum, dams impact the Earth’s climate.

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While dams can benefit society, they also cause considerable harm to rivers. Dams have depleted fisheries, degraded river ecosystems, and altered recreational opportunities on nearly all of our nation’s rivers.

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Engineers must de-water the river where the dam is meant to be built. This is done by diverting the river through a tunnel that runs around the intended construction zone. Tunnels like this may be lined with concrete and are usually dug out using a combination of drilling and explosives.

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How do dams affect groundwater? Removal of natural vegetation and infiltration or leakage from constructed reservoirs or dams can bring the level of the watertable to rise and carry stored salts to the soil surface and waterways.

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There are multiple benefits by big dams. They provide water for irrigation, prevents of floods and generates electricity. Large dams have the potential to save the country from critical food shortages. We cannot blame dams for improper rehabilitation.

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There are a number of reasons why you should consider storing water: Natural disaster (flood, earthquake, hurricane, etc.). If your local water source becomes polluted or contaminated. When you must turn off your water supply (frozen pipes, broken water main, local emergency, etc.).

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Answer: Rain water harvesting. storing water in any container. by storing water in underground tanks for use in emergency.

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Ans. In places with water shortage, water can be saved by storing water in tanks, buckets, pots and utensils and then using it carefully. Also wells and reservoirs can be dug and rain water can be collected for later use.

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A concrete arch-gravity type, in which the water load is carried by both gravity action and horizontal arch action. What is the maximum water pressure at the base of the dam? 45,000 pounds per square foot.

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Many dams built during the 1930-70s, an era of intensive dam construction, have an expected life of 50-100 years. Due to inadequate maintenance and/or for environmental reasons, some of these dams will fail or be removed in the next 50 years.

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A gravity dam is a dam constructed from concrete or stone masonry and designed to hold back water by using only the weight of the material and its resistance against the foundation to oppose the horizontal pressure of water pushing against it.

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It wouldn’t be flooded, since the water would start draining southeast of the city and rush south down the Colorado canyon away from Las Vegas Valley. However, Las Vegas gets all of its water from Lake Mead, so the city would quickly dry up.

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Damage to the Dam If catastrophe struck the Hoover Dam and it somehow broke, a catastrophic amount of water from Lake Mead would be released. That water would likely cover an area of 10 million acres (4 million hectares) 1 foot (30 centimeters) deep.

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Overall, China is believed to have more than 80,000 dams. Flood control and irrigation are China’s top two purposes for building large dams like the Three Gorges Dam on the Yangtze River and the Xiaolangdi Dam on the Yellow River.

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Hydroelectric power is produced with moving water At hydropower plants water flows through a pipe, or penstock, then pushes against and turns blades in a turbine to spin a generator to produce electricity.

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Water is a vital resource that has fuelled human progress. It transports solids, dissolves minerals, chemicals and nutrients, and stores thermal energy. This ‘carrier characteristic’ allows for countless industrial, agricultural, and transport processes that enable our society to thrive.

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How a hydroelectric dam is built? Forms are then built along the edges of the dam, rebar is placed inside, and concrete is pumped in. This is done in sections, and the concrete is poured bit by bit in a block formation. Once enough of the dam is built, the reservoir is allowed to fill in a highly controlled manner.

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A structure, built across a river or stream, that limits the amount of water and sediment moving downstream. The dam reduces the risk of flooding for downstream communities by releasing water in controlled amounts. Dams also store water for groundwater recharge.

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Dams are said to be an important source of water supply and high importance for various other reasons. They supply the water for the various means including domestic use, irrigation purposes and also for the industrial uses. Dams are also involved in the hydroelectric power generation and in the river navigation.

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5.1 Types of earth dams Earth dikes and dams are gravity structures used to impound water or semi-fluid wastes. Water is impounded for flood control, hydroelectric power production, recreation, domestic storage, and industrial uses, includ- ing waste storage.

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Why Are Some Dams Being Removed? There has been a growing movement to remove dams where the costs ” including environmental, safety, and socio-cultural impacts ” outweigh the benefits ” including hydropower, flood control, irrigation, or recreation ” or where the dam no longer serves any useful purpose.

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How Do Dams Damage Rivers? By diverting water for power, dams remove water needed for healthy in-stream ecosystems. Stretches below dams are often completely de-watered. Dams prevent the flow of plants and nutrients, impede the migration of fish and other wildlife, and block recreational use.

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Hoover Dam Wasn’t Just Built To Supply Power For one, it was built in an effort to help control flooding of the Colorado River as it snaked through the southwest on its way to the Gulf of California. Also, as the west opened up and more people settled there, the need for water increased.

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Answer: A dam is thicker at the bottom than at the top because the forces exerted are strongest close to the ground. Water pressure increases proportionally with depth, so the lower portion of the dam has greater water pressure exerted upon it.

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A gravity dam may fail by the failure of its material, i.e. the compressive stresses produced may exceed the allowable stresses, and the dam material may get crushed.

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A dam is a structure built across a river or stream to hold back water. People have used different materials to build dams over the centuries. Ancient dam builders used natural materials such as rocks or clay. Modern-day dam builders often use concrete. Manmade dams create artificial lakes called reservoirs.

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Dam Basics The materials used for construction of dams include earth, rock, tailings from mining or milling, concrete, masonry, steel, timber, miscellaneous materials (such as plastic or rubber) and any combination of these materials.

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