Large-scale hydroelectric dams continue to be built in many parts of the world including China and Brazilbut it is unlikely that new facilities will be added to the existing U.
Negative Impacts of Hydroelectric Dams written by: However, there are some negative environmental effects of building large hydroelectric dams.
Until now somedams have been constructed worldwide. However, many negative effects of large hydroelectric dams have come to light, slowing the progression of future dams. Not all dams are constructed for the generation of electricity.
Some of them are just for the storage of water for the dry months. There are different types of hydroelectric power plants, and not all require a reservoir of The effect of hydroelectric water dams.
Here are three of the main types: Storage type hydroelectric power plants with dams for collecting and storing water. Water can be stored for summer months or for dry years, depending on the capacity of the reservoir. Run of the river type of hydroelectric power plants that do not collect water but are built on rivers which have a good flow and natural rivers coming from a height having good potential energy.
Pumped storage types of hydroelectric power plants where water is pumped up to a reservoir in off-peak hours and electricity is generated in peak hours to supplement the production. It is like a storage facility for electricity. Does not emit any direct pollutants or greenhouse gases.
While the initial cost is high, they are very inexpensive to operate. Electricity generated by hydro-electric power plants is the cheapest electricity generated. Dams store water for irrigation in summer seasons and dry months. Many desert areas can now farm due to dams and canals that supply water.
Dams supply water for local drinking needs. Allows for fish farming. People have to be displaced causing change in life style and customs, even causing emotional scarring. About 40 to 80 million people have been displaced physically by dams worldwide.
Large amounts of plant life are submerged and decay anaerobically in the absence of oxygen generating greenhouse gases like methane.
It is estimated that a hydroelectric power plant produces 3. The migratory pattern of river animals like salmon and trout are affected. Dams restrict sediments that are responsible for the fertile lands downstream.
Farmers use chemical fertilizers and pesticides to compensate for the loss in productivity. Salt water intrusion into the deltas means that the saline water cannot be used for irrigation. Large dams are breeding grounds for mosquitoes and cause the spread of disease.
Farmers downstream who used to wait for the flooding of the fields to plant their seeds are affected. Dams serve as a heat sink, and the water is hotter than the normal river water.
This warm water when released into the river downstream can affect animal life. Peak power operations can change the water level thirty to forty feet in one day and can kill the animals staying at the shorelines.
Aroundkm2 of land worldwide has been submerged due to the construction of dams. Fish passages should be created to aid in the migration of the fish. New dam sites should be chosen with the environmental impacts in mind. Local people should be led into confidence and must be suitably re-settled.
Proper compensation as per the market rate should be given.
Religious monuments of historic significance should be shifted. Endangered species can be relocated. If the political will to change and do a good job is there a dam can be constructed in a way to minimize its effects on people and the environment.With the negative effects of building a large hydroelectric dam becoming apparent, we wonder whether it is worth it.
In this article we discuss the need for building dams, the advantages of dams, and the negative impacts of dams. As animals, plant life and people are affected, the environmental as well as the social costs of building dams should be considered. Hydroelectric Dams works by letting the energy of the water flow turn into an electric voltage.
Then water goes through a series of turbines, then the water makes the turbines turn, and then it creates electricity for us to use. Hydroelectric power water use. Learn More Hydroelectric power. Hydroelectric power and water; hydroelectricity is still important to the Nation.
Nowadays, huge power generators are placed inside dams. Water flowing through the dams spin turbine blades (made out of metal instead of leaves) which are connected to generators. Hydroelectric. Feb 25, · Altering the timing and magnitude of discharge fluctuations can minimize the adverse effects of operating hydroelectric dams on the productivity of downstream salmon populations.
Hydroelectric energy is produced by the force of falling water. The capacity to produce this energy is dependent on both the available flow and the height from which it falls.
Building up behind a high dam, water accumulates potential energy. Most dams are used for purposes such as irrigation, flood control, and water treatment. Further, many dams support a combination of activities. For example, dams on the mainstem of the Columbia River are used for irrigation, flood control, transportation, recreation, and the production of electricity.