Water-Necessity of Humanbeing.

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              The earliest dams were used for to water farms. The early Egyptians made dams of dirt that were made to raise the level of the water so it could reach their farms. The pilgrims even made dams when they first came to North America. Their dams where used to turn their wheels to grind the corn and to saw the timber. An artificial lake that is made by a dam is called a reservoir. The part of the dam over which the water spills is called the spillway. Water can pass over the dam also. It can also get through by chutes, tunnels, or shafts. The pipes for conducting the water to the power turbines are called penstocks. All the water that flows through is controlled by control gates. Dams are manly built for water supply, irrigation, electric power, flood control, and also improvement of navigation.