Hydroelectric power 2013

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Clic on the individual links below to see the presentations from Friday 4th Oct 2013

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Advantages: It is flexible, it can be activated and deactivated very easily. The costs for users is also very low. It costs a penny a day. It can also be used near industry , then they don't make Carbon Dioxide. It is also good for water sports, it has an high current when it comes out of a dam. Disadvantages: It can destroy biological life, the routs that fish swim can be blocked, so a lot of fish can die. Also when the water level is low, there will be less water flowing through the penstock and therefore less electricity will be generated. The people also have to move because the dams need a lot of space.


Jody

How does hydroelectricity work?

Hydroelectric power is made by the movement of water. It is made with waterfalls and rapid but it is usually made with dams. The water behind the dam flows through the penstock to the lower water level. The water pressure increases as it goes as it goes down to the turbines and generator and the generator makes the electricity as it spins. The process is similar to a dynamo from a bike. After that process the water evaporates and the water forms a cloud and then it rains back into the higher water level and the whole cycle continues.

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Sandra

Where can you find “plants” of hydroelectricity and why?

We can find hydroelectric plants in 150 countries all over the world. China is the largest is the hydroelectricity producer. The power extracted from the water depends on the volume and on the difference in height between the source and the water's outflow. This height difference is called the head. To build a dam the water has to have enough power and we also need slopes so the water comes with more power and we can produce more energy, that's why some countries can't use hydroelectric power. We can find it in those 150 countries because there is a lot of water everywhere and you can build dams nearly everywhere.


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Lowie

Hydroelectric power can be used everywhere in the word, where there is flowing water, mountains or sluices. So it can also be used in Spain and the Netherlands. can it be used in the Netherlands?: yes, it is already being produced in Lith, near Oss is one dam that makes energy, but it is not optimal, because the high population per km2, and the water doesn't flow very quickly Can it be used in Spain?: it can be used, there are some dams in Spain whom make electricity, in Spain, there are fast flowing rivers, so it is better in Spain then in the Netherlands the dams in Spain are called Alcántara Dam

   Aldeadávila Dam
   Almendra Dam.                  It can be used only in the flowing rivers, not the lakes

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picture of places were dams are located in the world

Simone

Is hydroelectricity bad for the environment?

Hydroelectricity is one of the greenest ways of producing energy. It is very cheap and it has no air quality impacts. This is because no fuels are burned. Hydroelectricity is not bad for the air but it is for nature. Some fishes for example, swim upstream so they can spawn. Of ºcourse there is technology like fish ladders to get the fish over the dam. But it still disturbs their migration patterns. It can also lower the oxygen in the water which is bad for the fish and other inhabitants in the water. To make a hydroelectric dam there is a lot of land needed. people had to move out of their homes so these dams could be made. A lot of trees have to be out of the way. Of course it's bad to cut down trees.


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