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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
The one feature common to the Hoover Dam, the Mississippi River and the Three Gorges Dam is that they all try 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.
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.
Based on the events that lead to the devastating floods in Queensland and the eventual case that was brought against the engineers of the dam, there have been views from both sides of the divide as to whether or not the actions taken by the engineers were actually ethical or otherwise. We have explored this avenue and have found that both sides of the divide have good reasons to justify their actions. Firstly, we shall explore the avenue that the engineers decisions were appropriate and ethical. It can be said that the engineers did employ act utilitarianism in their decisions and actions, hence causing these decisions to be ethically correct. Act utilitarianism is essentially doing the right thing, which would benefit the majority of people, based on the situation that is currently taking place. One of the reasons that explains why the actions taken could be considered as ethically fine, was that if the dam was not opened, there would have been no other way to solve the increasing water levels in the dam. If no action was taken, there could have been seriously devastating effects, like the dam wall eroding due to water spilling over the dam wall, thus weakening the structure, or a loss of water flow control. Professor Hubert Chanson, a professor in hydraulic engineering in the University of Queensland, mentioned that the Wivenhoe Dam was actually designed as an embankment dam, hence it should not be overtopped, that is water should not be allowed to flow over the limits of the dam (Andersen 2011). Despite there being a secondary spillway, however it is recommended that spillway is not put to use, as the use of that spillway would mean that there would be a surge of water leaving the dam, and a loss of control of the water flow, w...
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
The Colorado River is formed by small streams created by a huge amount of snowmelt from the Rocky Mountains. The ecology and flow of the river varies highly by region. The river is divided into two different regions, the Upper Basin and the Lower Basin. Beginning in the early 1900s, western states began to build dams in the Colorado river, diverting the water flow to fast growing cities like Los Angeles, San Diego, and Phoenix. The river now services over 30 million in the southwestern parts of the United States and Mexico (Patrick 1). Diverting the water of the nation’s seventh-longest river may be seen has a great accomplishment, however to others this is a great crime against nature. Over the past couple years the river has been running significantly low, since a drought has come up the southwest. At the lakes edge, “bathtub rings”, lines in the rock walls, can be seen showing the decrease in water level. It is recorded in some areas of the river that the water has lowered 130 feet since 2000. Some water resource officials say those areas will never be filled back to normal. The surrounding states must adjust to living with less water or further actions need to be taken to save the river’s water. There has been some talk about adding water to the river to replenish the river but nothing has hap...
...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.
In the beginning of the construction of the Three Gorges Dam, there were several problems. There were several protestors and opinions about the dam before the Three Gorges Dam project was even started.1 China has had history of several dam failures in the mid-1970s that were responsible for thousands of deaths. The three gorges (Xiling, Wu, and Qutang) have scenery that is a tourist attraction.2 The dam was going to be a little over 600 feet tall, 7500 feet wide, and hold over 97 trillion gallons of water. Because of all of the population increase, China started using coal power plants1 and shipping, which causes acid rain over the region making the Yangtze River is one of the most polluted rivers in the world.4 It does not help that the Yangtze River runs right through Chinas industrial heartland. Using the river to transport their goods to other parts or China adds to the pollution.2 Pollution from mines, hospitals, and garbage dumping is another big problem for the river because the pollution is building up around the dam.1 With the Three Gorges Dam will come landslides because of the rising water tables and the large slopes with unstable soil from local farming causing more sediment being added to the river.3 And because the dam lies on a fault line there will also be an escalation of earthquakes. There is a huge decrease in sediment discharge; which caused a 90% sediment load into thousands of other reservoirs. Before the dam was operational, it was retaining water and sediments.4 The water levels were rising faster than anyone expected, therefore, the finish date had to be moved up.1 Scientists even projected that 70% of sediment discharge would be trapped for the first two decades and 44% would be store...
Looking at the dam’s environmental harm specifically, it is clear that this project should immediately cause. "Environmentalists warn that sewage will back up and destroy the precious habitats for river dolphins, giant pandas and other rare animals.
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.
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.
Animals could be impacted a forced to live in alternative areas and a myriad of other consequences.
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.
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.