Possibly not the best phrased question however you could say that a hydro dam is a dam that's primary function is the generation of hydropower. I note that under the heading o…f dam there are links to a hydropower page. (MORE)
They are dams that hold back water but also generate hydro electricity by using the force of gravity pushing the water down and through large generators in order to pass throu…gh the dam. Hence why theres usually water coming out the other side of them. (MORE)
Very carefully More seriously, there are two main types of hydrolectric installations: Impoundment, and run-of-river (there's also electricity generation from the tides, wa…ves, etc, but we'll leave those aside for now). The impoundment types are probably what you're thinking of when you say 'hydro dam'. These are large dams which create a reservoir upstream. The water in the reservoir is then forced to flow through penstocks within the dam which direct the flow to where it can power turbines which are in turn used to generate electrcity. The dams themselves are usually concrete, while the turbines are usually metal. The run-of-river type involves diverting water from a river and once again using it to turn turbines. The turbines are again usually metal. They can be housed in a building made of just about any material, and some of the older ones are quite pretty stone buildings etc. (MORE)
Ugly, loss of land habitat, impedes silt from reaching lowland where it is important, impededs fish migration and reproduction, causes a risk of catastophic flooding if it fai…ls, creates a prime target for your enemies. (MORE)
Depends on the size of the dam, and how the water ismanaged. .
Big dams will flood big areas of land, and limit the amount ofwater flowing downstream, which can cause drought…. .
Dams can also stop seasonal flooding, which the wildilfe mighthave adapted to. (MORE)
A dam is a wall that holds back water on one side. Such a dam canbe made to release this water though a pipe into which a propelleris fitted. As the water flows down the pipe,… this spins thepropeller, which in turn spins a dynamo that generates electricity.As the source of electricity is water power, the term used is"hydro electric power" - "hydro" refers to water. (MORE)