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[[File:Überlauf_Edertalsperre_vom_Uhrenkopf.jpg|Überlauf Edertalsperre vom Uhrenkopf|thumb]] [[File:Roman_Cornalvo_dam,_Extremadura,_Spain._Pic_01.jpg|Roman Cornalvo dam, Extremadura, Spain. Pic 01|thumb|left]] [[File:Sushtar_Bridge.jpg|Sushtar Bridge|thumb|left]] [[File:Engraving_of_Rideau_Canal_locks.jpg|Engraving of Rideau Canal locks|thumb]] [[File:Lake_Parramatta,New_South_Wales.jpg|Lake Parramatta,New South Wales|thumb]] '''Dam''' is a structure built across a [[stream]], [[river]], or [[waterway]] to control the flow of or raise the level of water. The purpose of a dam can vary from [[irrigation]], [[flood control]], water supply, and [[hydroelectric power generation]] to recreation and environmental protection. Dams are significant engineering projects and have a profound impact on the landscape and ecosystems where they are constructed.

==History==
The history of dam construction dates back thousands of years, with ancient civilizations such as the Egyptians and Mesopotamians building early versions of dams for irrigation and water control. The oldest known dam is the Jawa Dam in present-day Jordan, dating back to around 3000 BC. Throughout history, the technology and materials used in dam construction have evolved, from simple earth and rock structures to complex concrete and steel designs.

==Types of Dams==
There are several types of dams, classified based on structure, material, and purpose. The most common types include:

* [[Gravity Dam]]: A massive structure made of concrete or stone that relies on its weight to hold back water.
* [[Arch Dam]]: Curved in shape and designed to transfer the water pressure to the valley banks.
* [[Embankment Dam]]: Built with earth and rockfill, these dams are the most common type and can be used in a wide range of locations.
* [[Buttress Dam]]: Supported by a series of buttresses on the downstream side, providing strength to hold back water.
* [[Cofferdam]]: A temporary dam used during construction projects to divert water.

==Environmental Impact==
The construction and operation of dams have significant environmental impacts. While dams can provide benefits such as flood control and renewable energy, they can also lead to the displacement of communities, loss of wildlife habitats, changes in river ecosystems, and the accumulation of sediment. The creation of large reservoirs can result in the submergence of vast areas of land, affecting local flora and fauna. Efforts to mitigate these impacts include fish ladders, sediment management practices, and habitat restoration projects.

==Major Dams==
Some of the world's most famous dams include the [[Three Gorges Dam]] in China, the largest hydroelectric power station by total capacity; the [[Hoover Dam]] in the United States, known for its significant role in water supply and flood control in the American Southwest; and the [[Aswan High Dam]] in Egypt, crucial for irrigation and preventing floods along the Nile River.

==Future of Dam Construction==
The future of dam construction faces challenges including environmental concerns, the displacement of local communities, and the need for sustainable development practices. Advances in technology and engineering may lead to more environmentally friendly and efficient dam designs. Additionally, the focus on alternative renewable energy sources could influence the role and necessity of dams in future energy production.

[[Category:Engineering]]
[[Category:Environmental engineering]]
[[Category:Hydrology]]
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Dam - Revision history

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