Q:

What are disadvantages of dams?

A:

Quick Answer

Dams block fish migrations and keep sediment from washing downstream. When initially installed, dams usually cause flooding on the side of the dam where the water flows. Dams create large bodies of stagnant water, which have a few dangers, such as encouraging mosquito breeding.

Know More
What are disadvantages of dams?
Credit: devid75 Moment Getty Images

Full Answer

Dams, especially large ones, have the potential to cause a lot of problems for the surrounding area, especially the area behind the dam where the water flows toward the blockage. There are disadvantages for both the nature and any people living in the area.

There are many negative effects on nature. Since dams block up flowing bodies of water, such as rivers, any animals that depend on the flow to reproduce or as part of their life cycle are put in danger. Migratory fish that mate in a different location than they live the rest of their lives, for example, are unable to mate and may decline in population. The buildup of water is also dangerous for plant life that grows on the natural shoreline of the water. The plant life is submerged and dies. In addition, the beneficial sediment that normally is washed down the river is blocked, which decreases the fertility of the soil downriver from the dam.

Many humans are displaced due to dams. Humans who live in an area that is to be flooded due to a new dam have to relocate and lose their homes to the rising water.

Learn More

Related Questions

  • Q:

    What are the benefits of wetlands?

    A:

    Wetlands offer several ecological benefits, including the purification of water. They serve as sponges to absorb toxins and sediment before runoff enters streams, lakes or the groundwater supply. They provide important habitats for wildlife and recreational places for people.

    Full Answer >
    Filed Under:
  • Q:

    How is coal converted to usable energy?

    A:

    Coal is converted into electricity through a complex process that involves steaming, grinding, processing and distribution. The act of transforming coal into electricity is quite a production; coal is first ground to a fine chalky powder and added to combustion chambers of boilers before being burned at higher temperatures to produce hot gas and heat energy. Eventually, coal is sent to a generator, where it is then converted into electricity and disseminated through wires to substations and transformers.

    Full Answer >
    Filed Under:
  • Q:

    What are different types of resources?

    A:

    There three types of resources: natural, human and capital resources. A natural resource refers to elements or things found in the environment such as land, water and minerals. Human resource refers to people, while capital resources refer to money, tools and equipment.

    Full Answer >
    Filed Under:
  • Q:

    Where was oil first discovered?

    A:

    Oil was likely first discovered in the Middle East, in what is now Iran. The Achaemenid Empire army used oil in fire weapons as they invaded castles and cities in the sixth century B.C.

    Full Answer >
    Filed Under:

Explore