Hydropower

Hydropower is an power who can be found from streaming water depending on the earths gravity. It is a power that is derived from the force or energy of moving water, this might be harnessed for useful purposes.
Before the public access for hydropower was allowed. Hydropower was used for irrigation, and operation of various machines, such as water mills, sawmills and dock cranes.

Hydropower has been used for hundred of years. The start were in India, where they made water wheels and water mills.
In the 1830s, at the peak of the canal-building era, they were using hydropower to transport the traffic of barges up and down very steep hills by using inclined plane railroads. Inclined plane railroads is an operation were they attach two cars to each other by a cable, which runs trough a pulley at the top of the incline.

The largest use of hydropower today is for the creation of hydroelectricity, which allows low cost energy to be used at long distances from the water source. This is the most widely used form of renewable energy.

When you build an hydropower station you also changes the environment for all kinds of fishes around the station. Rivers below the station pretty much gets dried out because the rivers above the station gets filled up totally by the water. Many plants and animal kinds totally disappears from the area or might not be able to live as they use to do before the station was built.
The big concrete pond makes it impossible for the streaming water to pass, which makes some kinds of fishes cant live like they did in the old environment, this might make some species of fishes to die out totally.