The Hirakud Dam is the World's largest earthen dam. it is built across the Manhanadi River in India.
Hoover Dam is what is called an arch-gravity dam. The name curved-gravity dam or arched dam might also be applied. This type of dam uses a curve or arch which has it's apex or "top" directed...
hydroelectric dam (dam that produces electricity using the water it holds back)
It is a Solid or a Frame structure.
The hirakud dam in orissa, India is the longest dam of the world