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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.
What else can I help you with?
Why would construction of a dam on a river be a concern to local communities?
Dams harm ecosystems surrounding the river.
The role of the coffer dam in the construction of a dam?
coffer dam
Name of dam built on riverNiger?
Markala Dam Kainji Dam Kandadji Dam (currently under construction)
Which is aided Tehri dam construction?
Teheri dam ;encyclopedia,Wikipedia
Are there landforms that begin with the letter X?
The Xiaowan Dam is a landform in China.
What were some of the Innovations that made the construction of the Hoover dam?
Some of the innovations that made the construction of the Hoover Dam possible is.....................................................................................................................................................................................................................................................................................................................................................................................................................GO AND DO YOUR MOM!
What year was the consruction started for conowingo dam?
Construction of the dam started in 1926.
When was the colebrook dam built?
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.
One successful public works project begun under president Hoover was the?
Construction of a major dam on the Colorado River.
Where did the sand for the Hoover Dam concrete come from?
The sand used for the concrete in the Hoover Dam primarily came from local sources, specifically from the nearby Colorado River and surrounding areas. Large quantities of sand and gravel were transported to the construction site to create the dam's concrete mix. This local sourcing helped reduce transportation costs and ensured that the materials were readily available during the massive construction project.
When did the construction of the Pati dam start?
The construction of the Pati Dam began during 1996-1997.
What matrials were used to build Norris Dam?
Norris Dam, completed in 1936, primarily utilized concrete and steel for its construction. The dam's structure comprises a combination of reinforced concrete and earth fill, with a significant amount of concrete used for the spillway and powerhouses. Additionally, the dam's foundation was constructed using various rock materials from the surrounding area to ensure stability and durability.
