Water is the world’s most precious resource. It is essential for all life and most industrial processes, but in many places the water supply is insufficient or erratic. Rivers can dry up or can cause disastrous floods that devastate large areas of land. Dams allow water to be stored in reservoirs, enabling the water supply to be controlled throughout the year. And water from a reservoir can be used to drive turbines which provide electricity. The electricity can then be used to pump water to a distant city. Dams have to withstand more pressure or weight than any other man-made structure. In the 20th century, dam-building represents the peak of engineering skill and imagination. It has produced structural forms as daring and original as any the world has seen.
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