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Positive and negative consequences of dams and reservoirs
A comprehensive essay on dams
Positive and negative consequences of dams and reservoirs
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Negative Impacts of Damming
For beavers, dams are a necessity. Not so much for humans. People are becoming increasingly aware of the negative effects dams pose to the landscape they are built on, the people and cultures that inhabit the surrounding areas, the economy in those areas, and the local wildlife. Though dams provide a constant water source, they diminish the environment further downriver, displace local populations, are paid for through people’s tax money, and cause the extinction of many species of fish and animals.
Dams tend to have a negative effect, not on just the environment, but on the people in the surrounding areas as well. There have been times where a dam has been gone to built that people have had to just pick up and move
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Throughout history, over time the world has become more and more populated creating more and more commerce. Forests are being torn down, water is being wasted and polluted, and chemicals are being added to farmland for better production. We are changing the world to better fit our needs day in and day out. We are using up resources quickly and need to slow down. Damming is another way in which humans change the course of nature for their own benefit. By building dams so much destruction to nature is happening. To list a few: damming can be the cause of increase in earthquakes, pollution in water. They can be, detrimental to animal habitats, the cause of extinction of certain aquatic life. Due to the placement of the dam animals may have to change their transportation route pr move all together thus changing the life in that geographical area. With the help of dams the number of reproduction of migrating fish decreases along with abuse of adult fish and much more. It is important to keep our environment healthy and as natural as possible in order to continue living on this earth. the health of the people who live on this earth depends on the earth itself, therefore we need to keep the earth natural and healthy as well. By putting up dams and interrupting the natural course of our environments we are only hurting ourselves over …show more content…
Firstly, dams are very expensive to build. There is a lot of raw materials and labor required to build each dam. After the massive recession of 2008, the government is trying to cut down its expenses in every sector of the economy. The state has to pay compensation to the people affected by construction of dams. Necessary facilities has to be provided which results in construction of schools, hospitals, houses. All of this eventually leads to a rise in government expenditure. In USA, the cost of constructing the Hoover Dam and Grand Coulee Dam was $49 million and $168 million respectively. The World Commision on Dams found that on average, large dams have been at best only marginally economically viable. The average cost overrun of dams is 56%. This means that when a dam is predicted to cost $1 billion, it ends up costing $1.56 billion.These figures are quite high and alarming and suggest that un-damming is essential. Secondly, as mentioned above, damming involves displacement of people from one place to another. This is also the case with local and nearby businesses. Small businessmen may have to relocate or even shut down their businesses, plants, factories and more. Over the years, it has been observed that there has been a significant reduction in the jobs for fishermen due to lack of fishes. Also, damming leads to an imbalance of water
Federal Emergency Management Agency’s article, “Benefit of Dams” (2012) analyzes how dams prevent flooding by releasing the excess water in controlled amounts through floodgates (¶ 3).
The one feature common to the Hoover Dam, The Mississippi river and the three gorges dam is that they all tried to control nature’s swings, specifically in the form of flooding. Before the Hoover dam was built, the Colorado river “used to flood spectacularly…but after 1900 the Colorado provoked a vehement response” (Pg 177). The response was simple, but large. The U.S. built several large dams, including the Hoover dam, on the Colorado to decrease its flooding and increase power and irrigation. Unfortunately, just as human control of the Colorado’s flooding increased, its organisms and habitats were detrimentally influenced, and the water became more and more salinated.
Policies are often put in place without regards for the effect it will have on other areas, people, or wildlife. Several examples of these unintended consequences are shown in the documentary Salmon: Running the Gauntlet, which explains the effects that human activity, dams, and attempts to repopulate the salmon species have been implemented and failed. With proper evaluation at the onset of a major project, these severe consequences may be avoided.
The negative aspects of Glen Canyon Dam greatly exceed the positive aspects. The dam’s hydroelectric power supply is only three percent of the total power used by the six states that are served by the facility. There is a surplus of power on the Colorado Plateau and with more and more power-plants being created in the western hemisphere, Glen Canyon Dam’s power is not needed (Living Rivers: What about the hydroelectric loss). Although the ‘lake’ contains twenty seven million acre feet of water, one and a half million acre feet of water are lost yearly due to evaporation and seepage into the sandstone banks surrounding the ‘lake’ (Living Rivers: What about the water supply?). The loss of that much “water represents millions, even billions of dollars” (Farmer 183). If the government were to employ more water efficient irrigation practices, as much as five million acre feet of water per year could be saved.
Beyond all of Abbey's personal feelings and emotional memories, let us not forget about what these dams and reservoirs are providing us with-power. Electricity is extremely important to everyone. It is the reason for seemingly everything people consider vital to their lives; cars, computers, TV, running water through the faucet, everything. It is not something we can just forget about because of an author's emotional attachment to a certain strip of land sacrificed to make thousands of other people happy sitting safe in their home with electricity.
Over the years Glen Canyon Dam has been the spark for hundreds of debates, rallies, and protests. These debates have been going on for almost forty years now. The fact is that the dam created a huge lake when it was built, this is what bothers environmentalists. This lake is called Lake Powell and thousands of people depend on its tourists for income. The lake also filled up a canyon called Glen Canyon, some people say it was the most beautiful place on earth. The anti-dam side of the debate has its basis in the fact that Lake Powell is currently covering Glen Canyon. It was very remote so few people got to witness its splendor. This is probably the reason the dam was built in the first place, ignorance.
In the 1898 mayoral election, Frederick Eaton was elected as mayor of Los Angeles; and appointed his associate, William Mulholland- the superintendent of the newly created Los Angeles Department of Water and Power. Eaton and Mulholland envisioned a region of Los Angeles that would make Los Angeles become the turn of the century. The limiting factor of that regions growth was water supply. Eaton and Mulholland realized that the Owens Valley had a large amount of runoff from the Sierra Nevada, and a gravity-fed aqueduct that could deliver the Owens water to Los Angeles. During the early 1900’s the United States Bureau of Reclamation made plans to build an irrigation system to help the farmers of the Owens Valley. By 1905, through purchases, and alleged intimidation and bribery, Los Angeles purchased enough water rights to enable construction of the aqueduct.
Dams made from dirt are very weak and the South Fork dam was built entirely with dirt. From an engineering standpoint dams made with dirt needed to be built ...
To begin I’m going to talk about Rachel Carlson and her ideas. She first starts off with how man has polluted our rivers and many other valuable resources (Postman 2). She explains how the damage humans
...cause there was no established rules for building specifications and anyone was allowed to go in and do what they think will work. That is were the lack of professionalism comes into play, the man hired to fix the dam was un ethical in fixing something that he had no knowledge of and was not trained to do it, and this is why lives were lost. This disaster had a large affect on the nation, the largest being the disasters involvement in the creation of the Red Cross.
If the dam is so beneficial then why is it that all public debate on the issue has been banned since 1989, even for "…scientists and specialists"(Faison, 1997). This has probably been done to slow the process of or eliminate any opposition that may arise to this project. There are a few questions or "What if’s" about the dam, such as "What if the dam collapses?" or "What if during a war or conflict a bomb is dropped on the dam?" and since the dam is built on many seismic faults, will earthquakes be a problem? Besides all of these questions, there are numerous facts that should dissuade any proponent of the dam to insist on its construction. The dam besides hurting the environment, will also "…displace 1.3 million people."(Giaccia, 1997). These people were not asked to leave, they were told, and many of them still have not been compensated for their trouble, but this goes deeper than financial burdens. Individual rights have been violated, the government simply forced these people off their land and out of their homes and this affects children, families and livelihoods.
In the late 1800’s and early 1900’s, John Muir, a naturalist, and Marsden Manson, an engineer for the city of San Francisco, engaged in a heated debate over the construction of a dam in Hetchy Hetchy Valley. Muir wanted to preserve nature for the future, so he objected to the dam because he felt it would destroy the beauty of the area. On the other hand, Manson believed building a dam would provide water and electricity to the thousands of people who lived in the city of San Francisco, and this would preserve the well being of the human race for the future. Both men had good points and arguments to support their views; however, in the end you have to look out for your own kind. If there is a choice about the well being of the human race or nature, I believe there is only once choice to be made – the future support of the human race.
One of the main challenges of keeping Lake Powell full is that the Sierra Club, a very powerful lobbyist in the specific area of environmental impact, now wants to empty the lake. The sierra club and other supporters have two main arguments in which they base their claim. (“Glen”) One is the saving of an ecosystem that is dying because of the filling of Glen Canyon; another is the loss of the beauty of the canyon and other sites of archeological and cultural importance.
Animals could be impacted a forced to live in alternative areas and a myriad of other consequences.
The paragraphs below will prove that the construction and presence of dams always has and will continue to leave devastating effects on the environment around them. Firstly, to understand the thesis people must know what dams are. A dam is a barrier built across a water course to hold back or control water flow. Dams are classified as either storage, diversion or detention. As you could probably notice from it's name, storage dams are created to collect or hold water for periods of time when there is a surplus supply.