Reservoirs held behind dams affect many ecological aspects of a river. Rivers topography and dynamics depend on a wide range of flows whilst rivers below dams often experience long periods of very stable flow conditions or saw tooth flow patterns caused by releases followed by no releases. Water releases from a reservoir including that exiting a turbine usually contains very little suspended sediment, and this in turn can lead to scouring of river beds and loss of riverbanks; for example, the daily cyclic flow variation caused by the Glen Canyon Dam was a contributor to sand bar erosion. Older dams often lack a fish ladder, which keeps many fish from moving up stream to their natural breeding grounds, causing failure of breeding cycles or blocking of migration paths. Even the presence of a fish ladder does not always prevent a reduction in fish reaching the spawning grounds upstream. In some areas, young fish ("smolt") are transported downstream by barge during parts of the year. Turbine and power-plant designs that have a lower impact upon aquatic life are an active area of research. A large dam can cause the loss of entire ecospheres, including endangered and undiscovered species in the area, and the replacement of the original environment by a new inland lake. Large reservoirs formed behind dams have been indicated in the contribution of seismic activity, due to changes in water load and/or the height of the water table.
Depends on the size of the dam, and how the water is managed.
Big dams will flood big areas of land, and limit the amount of water flowing downstream, which can cause drought.
Dams can also stop seasonal flooding, which the wildilfe might have adapted to.
Dams harm ecosystems surrounding the river.
coffer dam
The construction of the Pati Dam started in 1991. It is located in Rajasthan, India, and serves various purposes such as irrigation, water supply, and hydroelectric power generation.
Markala Dam Kainji Dam Kandadji Dam (currently under construction)
Teheri dam ;encyclopedia,Wikipedia
The Xiaowan Dam is a landform in China.
Some of the innovations that made the construction of the Hoover Dam possible is.....................................................................................................................................................................................................................................................................................................................................................................................................................GO AND DO YOUR MOM!
Construction of the dam started in 1926.
Construction of a major dam on the Colorado River.
The construction of the Colebrook River Dam began in May 1965. Construction on the dam was finished in June 1969. It cost a total of $14.3 million dollars to complete.
yes
Lake Mead is formed by the dam; until the dam was finished, there was no Lake Mead to hold back. The river was diverted during the construction.