The same thing modern dams are used for. To hold back water.
The Chinese have built dams to prevent flooding.
Dams can be used to produce hydro electric power
electricity dams/hydro dams
electricity
Potential energy is used to tap at dams. The energy is stored due to the height of the dam.
You can both get fresh water from the wells and dams.
not many of them
Singapore does not use hydroelectric dams to generate electricity.
They built dams to conserve water and irrigation channels to distribute it.
They had built weirs, dams, lakes and irrigation channels.
Nehru called dams 'impotant of modern India' in the sense that he was affirming a commitment to modernisation and socialism in post-Independence India. Whilst temples might be seen as mystical, traditional and ancient, dams signified rationality, progress and modernity.
Dams can and have prevented the fish from getting to their normal breeding grounds which they have used for thousands of years.