because the river might over flow
The Koyna dam is built across the Koyna River.
Hoover Dam was built on the Colorado River.
the dam built on jhelum is mangla dam
the Colorado river
tehri dam
on the Murray river
The Three Gorges Dam is built on the Yangtze River in China. It is the world's largest hydropower project.
The Hirakud Dam.
threegeorges dam
The Three Gorges Dam is being built on the Yangtze River in South Central China.
It efect the dam because on of the dams is moving a way and the other dam is going the other way and if the dam is built right were the river conects it would efect the river or stream.
bhakra dam is located on river satluj which is located in punjab.