19 thoughts on “Hydroelectric Power”

  • The perception of the hidroeletric power as a definitive source of renewable eletric power has been changing in the course of the years. As a biologist the drawbacks of buiding a dam are bigger than it seems, here in South America to be precise Brazil, many dam systems generate a lot of green house effect gases, methane and carbon dioxide, primary production is high and forests are dense, creating a big organic material source for decomposition which will, in some cases, damage turbines due to a increase in carbon dioxide in the water and a decrease in pH and increase maintenance costs.
    The consequences on the natural enviroment are devasting, literally annihilating the benthic biota due to the change in water stratification, a lotic water body turns into a lentic enviroment, the bottom of the dam gets anoxic where only a few organisms can survive. Fish ladders are traps. Fish usually gets exausted by climbing it and in the end predatory fish are the waiting for hunting them, other times fish became adrift because there is no stream in reservoir to guide the way upstream.
    I could talk a lot more about it, if someone is curious try searching for a dam called Belo Monte, which sums up what kind of troubles a hidroeletric system can cause.

    Eexcuse me for any grammar mistakes, english is not my main language.

  • The perception of the hidroeletric power as a definitive source of renewable eletric power has been changing in the course of the years. As a biologist the drawbacks of buiding a dam are bigger than it seems, here in South America to be precise Brazil, many dam systems generate a lot of green house effect gases, methane and carbon dioxide, primary production is high and forests are dense, creating a big organic material source for decomposition which will, in some cases, damage turbines due to a increase in carbon dioxide in the water and a decrease in pH and increase maintenance costs.

  • The consequences on the natural environment are devastating, literally annihilating the benthic biota due to the change in water stratification, a lotic water body turns into a lentic environment, the bottom of the dam gets anoxic where only a few organisms can survive. Fish ladders are traps. Fish usually gets exhausted by climbing it and in the end predatory fish awaits for hunting them, other times fish becomes adrift because there is ni stream in the reservoir to guide the way upstream. Fish that gets into the turbine chamber undergoes from a pressure of several bars to 1 bar and dies of sudden decompression.
    I could talk a lot more about it, if someone is curious, try searching for a dam called Belo Monte, which sums up what kind of troubles a hydroelectric system can cause.

    Excuse me for any grammar mistakes, English is not my main language.

  • Hydro electric is good but has to be done properly. What I want you to address is food. Red meat uses a lot of fressh water and resources. Plants use less fresh water and fertilizers. Fish uses no fresh water and fertilizers. Oceans make up 70% of the planet. Address eating fish for nutrients omega-3, vitamins and protein. California has no water but they eat burgers and fresh water plants.

  • this videos are so helpful. they have helped me when I am studying because they are just one big review. please make more :-). they are truly helpful

  • Remco van Woerkom says:

    so i was thinking, if you were to have a really high waterfall and you'd build a dam at the top, then have big pipelines go all the way down and then have a couple turbines at the bottom, wouldn't that utilise a lot more of the potential energy? with some dams it looks like they are only using like 20 meters of heigt difference.

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