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What is sometimes build to control the flow of moving surface water?
Dam if I know. Sorry couldn't resist. It is a dam that crosses rivers to control the water flow. Dam's come in all sizes, shapes, and materials. One of the largest dams in the world is the Aswan dam that crosses the Nile River. It's a huge edifice made of cement and steel. Probably the smallest dams are the ones built by beavers. They use gnawed off branches and trees to block up small streams. Lots of man-made dams are built to provide hydro-electric power for the regional area. Hoover Dam in Nevada USA is such a dam. Others are built to provide flood control so that areas downstream don't get flooded out during heavy rainstorms for example. The Aswan Dam is both a flood control and power providing dam.
Once a dam is built upstream forming a lake upstream of the dam are you safe below the dam?
Absolutely
How much electricity does an average hydroelectric dam generate?
Although several large-scale dams can produce over 1000 MW, an average dam will produce anywhere from 80 MW to 500 MW. An average value for those would probably be about 200 MW.
What is increased in a dam by raising the water level?
Water pressure on the dam.
What nation shares the world's largest hydroelectric dam with Brazil?
The answer is Paraguay. The dam you are talking about is the Itaipú Dam, which is the world's largest hydroelectric power plant. However, the Itaipú Dam provides most of its energy supply to Brazil.
