Latest. © 2020 Greentumble. DAMS!! The benefit of dams to humans is the communities near the dam that would flood if the dam were not there. Dam crazy. Here, we assessed influences of dams and their environmental effects on the genetic diversity and population connectivity of a broadly distributed freshwater mussel, Nodularia douglasiae, in Poyang Lake Basin. While your car's tires may have intimate familiarity with the roads, most likely you ride atop them without much thought beyond how they'll get you from point A to point B. Slow-moving or still reservoirs can heat up, resulting in abnormal temperature fluctuations which can affect sensitive species. Dams have long been acknowledged for providing electricity without the pollution of other methods, for flood protection, and for making water available for agriculture and human needs. Earth Features Lesson 22b Learn Anywhere Plan. English Spanish Características de la Tierra Lección 22b Video Diario. How do Dams affect the environment? While most of the environmental impacts of dams have no remedy such as the retaining of silt which is required by the downstream ecosystem, some measures have been put in place such as the building of “fish ladders” to assist fish in reaching their upstream breeding grounds. While the creation of dams and reservoirs has many economic benefits, recent studies have shown that these human-made barriers can have several negative impacts on the environment. English. The World Commission on Dams estimates that 40-80 million people have been displaced by dam construction in living memory. More Environment. Dams (environmental effects) Most dams are built to control flood hazards, to store water for irrigation or other uses, or to produce electricity. What Is The Environmental Impact Of The Mining Industry? Reservoirs have been identified as breeding grounds for various disease-carrying pests, including mosquitoes that transmit malaria disease and snails that transmit schistosomiasis. How do hydroelectric dams negatively affect the environment? The Ecology of Dams Rivers possess a delicate ecology that depends on a regular cycle of disturbance within certain tolerances. This decreases plant productivity, negatively impacting fish and bird species2 and causing abrasion of fish gills, thus increasing potential for disease or mortality. Thankfully, renewable resources such as wind, solar, hydro, biomass, and geothermal power are almost within our grasp. These dams are also good targets for terrorist activity. Because of the dramatic effects their dams have on surrounding ecosystems, these mammals are considered a keystone species.By constructing dams they create wetlands-- lush environments which attract fish, ducks, frogs and other creatures. The decision usually comes down to a cost/benefit analysis taking into account how much power a given dam generates and how much harm its existence is doing to its host river’s environment. How much do hydroelectric dams cost? Because the river is no longer flowing freely, the water becomes stagnant and the bottom of the reservoir becomes becomes depleted of oxygen. Dams and reservoirs are synonymous with hydropower production. These sediments and nutrients can aid the production of algae and other aquatic weeds which are known to a… Due to increase in population size and economic related activities, the demand for more electricity continues to rise (International Energy Agency, 2006). One purpose of building dams is to control flooding during the wet season. However, the flooding, or inundation, of land and the management of the reservoir water can have an unfavourable effect on people, the wildlife and the environment, not only in and around the valley, but also downstream of the dam.