Which is the oldest manmade dam in the world, and what the contraversory arise on it?
The oldest dam was NOT built in the 1930’s. The first dams were believed to have been built in ancient Mesopotamia around 5000 BC, but the earliest recorded dam was probably one on the Nile River at Kosheish, Egypt, built around 2700 BC to provide water for Memphis, the ancient capitol of Egypt. It was flooded and destroyed shortly after construction because no spillway was built. The oldest dam still in use was built in 1300 BC at Orontes, in Syria.