Advantages for hydroelectricity

https://water.usgs.gov/edu/hyhowworks.hhtml

Renewable

Hydroelectric energy is renewable.


Pollution free

Generating electricity with hydro energy is not polluting itself.



Safe

Compared to others fossil fuels and nuclear energy, hydroelectricity is much safer.

http://energyinformative.org/hydroelectric-energy-pros-and-cons/

Question 3

https://www.portlandoregon.gov/water/39294