Millau Viaduct The Millau Viaduct is located on Millau and Creissels, France. The bridge stretches

3.5 million miles of water run throughout the United States; and since the country’s conception, over 80,000 dams have impounded 600,000 miles of these waters [1]. Dams were originally constructed to provide water to towns and establishes energy sources for mills and later hydroelectric plants. Because these dams were constructed decades ago, they’re reaching a critical point of obsoleteness where they cause more harm than good. Dam removal is increasingly popular across the country to address the ecological problems including habitat loss and sedimentation, despite potential for downstream harm, removing dams is more environmentally and economically cost effective than upgrading them. The Marmot, Glines Canyon, and Elwha river dam removal projects each highlight different challenges of dam removal, but overall

The clearance below ranges between the lowest point of 11.4 metres and the highest point of 12.7 metres. The arch is 102 metres in length, 10 metres wide, and 15 metres high. The bridge has a total weight of 360 long tons.

In 1992, The Elwha River Ecosystem and Fisheries Restoration Act of 1992 authorized the US Federal Government to acquire the hydroelectric power projects of Elwha Dam and Glines Canyon Dam, where are located on the Washington State for demolition for habitat restoration and decommissioning. The dam removals began in 2011 and finished in 2014. I wondering that why government decided to remove the dam and what happens in Elwha River after dam removal. In this paper, I write about the following topics: main purpose of the Elwha and Gliens Canyon dam, effects to the Elwha River as well as ecosystem after constructing dam, reasons of the dam removal, process of the dam removal, and effects after dam removal.

The Site C Dam is an $8.77 billion dollar project organized in British Columbia on the Peace River. A dam full of fresh maintainable water that is converted into energy, decreasing hydro bills and providing thousands of jobs. However, this debatable topic leaves us wondering if the harm the dam does to the ecosystem is really worth the energy, and if it is truly

Archeologist and historians criticize the building of the Three Gorges Dam because it is socially and environmentally destructive. This is because when the dam is finished, nearly 2 million people will have been displaced and 4000 villages, 140 towns, and 13 cities will have been swallowed up. Also, monuments, and priceless archeological discoveries of this countries culture will be lost

Hydroelectric dams as energy sources have many advantages; they provide a renewable energy source, it can take the place of fossil fuel usages, and while being built dams can significantly help jobs in the development industry (Perlman). However, these dams are extremely costly, not just economically but environmentally and socially as well. These costs can be demonstrated by looking at the consequences of other dams. Three Gorges in China: release of methane gases, deforestation, water pollution, ecosystem disruption. Glen Canyon Dam: sedimentation, endangerment and extinction of species endemic to the area, poor water quality, crippling of ecosystems downstream—and these are just the environmental impacts! All of these

The thirst for water has lead individuals and organizations to build dams across rivers at an alarming rate. During the early 1900s dams were being built so fast it was no longer big news when a dam was completed. These structures provided controlled irrigation water and hydroelectric power to the communities not only close to the reservoirs and dams, but also provided irrigation water and hydroelectric power to communities many miles away from the river. Negatively blocking the flow of the river has impacted fish ecosystems, increased evaporation of water, and flooded intricately important landscapes. These negative impacts, it can be argued, affect the humans living downstream or within the flood plain of the dam site. Dams

Studies before the dam removal have shown that 83% of the Olympic National Park has been untouched and is still considered a pristine wildlife habitat which is good news. This means that if the lower end from the dams and below can restored then the Elwha River ecosystem theoretically will recover as well. Of the lower 5 miles that was left available for fish spawning, not very much of it was usable. The dams cause a baseline shift in the lower river by changing the composition of the river bed from fine sediment to larger stones and boulders which is not prime spawning habitat for fish. The negative effects of the dams, both indirect and direct,

With human development, industrial pollution and other factors all contribute to the deteriorated condition of the river, which makes it difficult to determine the dams’ environmental impact in isolation. CITE That said, the current operations of the dam hamper and potentially prevent environmental improvement of the Colorado. In order to preserve some semblance of the Colorado ecosystem, man must restore the natural processes that created the ecosystem. The real question is how to do that, whether via dam decommission or a less extreme policy change.

I believe that the Hetch Hetchy Dam should remain in place because national resources and utilization of these resources can co-exist but we first must affirm the federal land act in which it states that it "recognizes the value of our Nation’s public lands and provided a framework in which they could be managed in perpetuity for the benefit of present and future generations." To maintain the Hetchy Hetch river valley for the present they should not disturb the ecosphere that is now in place. To do away with the dam there will be damage to the surrounding areas and be pro active in controlling any erosion and stabilization of the valley if it was drained. The vegetation and the original beauty will take many years to be reintroduced

Hydroelectric power plant is one of the major power plants all over the world in order to create electricity. It is also one of the best renewable energy sources on the planet earth. In ranking, Canada is the third largest country to produce hydroelectricity power. The efficiency of this power source is 90% and this is very impressive as the percentage of efficiency is very high. Hydro power plants generate 24% of the world’s electricity. More than 1 billion people are associated with hydro power plants as they use the power supply from hydro power plants.

- The Three Gorges Dam will produce 50 percent more power than South America's Itaipu Dam, which used to be the largest dam in the world.

They include the dying of various animals and seldom fish species. The landscape around the dam could be damaged to a great extend due to the rise of the Yangtze water level. Drainage outlet could occur and therefore some of the surrounding land-scape will be flooded.

The man-made sea created by the dam would submerge important archaeological sites, some dating as far back as the Paleolithic Age. Thousands of invaluable relics, ancient burial sites, 200,00 year old fossils, and new information of a little known, obscure people known as the Ba will be lost (Topping, 1996). Even though $37.5 million has been "earmarked for the rescue of archaeological sites threatened by the dam's construction" (Childs-Johnson, 1996), only "ten to twenty percent of these treasures could be saved." (Topping, 1996). Estimates range from $180 million to $360 million to save ten percent of the most important sites and monuments. The Chinese government is expecting these archaeologists to do work that normally requires hundreds of years within ten years. There is simply not enough money or manpower to salvage many of these invaluable cultural

In the Tigris River, the Ilisu Dam along with other dams has become a plan to sustain a water reservoir for the citizens of Turkey. Unfortunately, it has led to an increasing number of ecological impacts downstream. The project began in August of 2006 and has been met with much controversy, yet certain instances of how the dam affects the surrounding life including people and other organisms has become definite. With International Environmental Impact Assessments calling to be revised, but to no avail, it begins to make one investigate the risks of the construction of the dam and it’s ecological impact on the surrounding environment including aquatic, terrestrial, plant, and human life. This analysis will discuss what the Ilisu Dam is and